1980 eruption of Mount St. Helens - wikipedia 1980 eruption of Mount St. Helens 1980 eruption of Mt. St. Helens Photograph of the eruption column, May 18, 1980. Volcano Mount St. Helens Date May 18, 1980 ; 37 years ago ( 1980 - 05 - 18 ) Time 8 : 32 am PDT Type Plinian, Peléan Location Skamania County, Washington, U.S. 46 ° 12 ′ 1 '' N 122 ° 11 ′ 12 '' W ﻿ / ﻿ 46.20028 ° N 122.18667 ° W ﻿ / 46.20028 ; - 122.18667 VEI 5 Impact Approximately 57 deaths, about $1.1 billion in property damage ; caused a partial collapse of the volcano 's flank, deposited ash in 11 states and five Canadian provinces Map of eruption deposits On May 18, 1980, a major volcanic eruption occurred at Mount St. Helens, a volcano located in Skamania County, in the state of Washington, United States. The eruption ( a VEI 5 event ) was the most significant volcanic eruption to occur in the contiguous 48 U.S. states since the 1915 eruption of Lassen Peak in California. It has often been declared as the most disastrous volcanic eruption in United States history. The eruption was preceded by a two - month series of earthquakes and steam - venting episodes, caused by an injection of magma at shallow depth below the volcano that created a large bulge and a fracture system on the mountain 's north slope. An earthquake at 8 : 32 : 17 a.m. PDT ( UTC − 7 ) on Sunday, May 18, 1980, caused the entire weakened north face to slide away, creating the largest landslide ever recorded. This allowed the partly molten, high - pressure gas - and steam - rich rock in the volcano to suddenly explode northwards toward Spirit Lake in a hot mix of lava and pulverized older rock, overtaking the avalanching face. An eruption column rose 80,000 feet ( 24 km ; 15 mi ) into the atmosphere and deposited ash in 11 U.S. states. At the same time, snow, ice and several entire glaciers on the volcano melted, forming a series of large lahars ( volcanic mudslides ) that reached as far as the Columbia River, nearly 50 miles ( 80 km ) to the southwest. Less severe outbursts continued into the next day, only to be followed by other large, but not as destructive, eruptions later that year. Thermal energy released during the eruption was equal to 26 megatons. Approximately 57 people were killed directly, including innkeeper Harry R. Truman, photographers Reid Blackburn and Robert Landsburg, and geologist David A. Johnston. Hundreds of square miles were reduced to wasteland, causing over a billion U.S. dollars in damage ( $3.03 billion in 2017 dollars ), thousands of animals were killed, and Mount St. Helens was left with a crater on its north side. At the time of the eruption, the summit of the volcano was owned by the Burlington Northern Railroad, but afterward the land passed to the United States Forest Service. The area was later preserved, as it was, in the Mount St. Helens National Volcanic Monument. Mount St. Helens from Monitor Ridge showing the cone of devastation, the huge crater open to the north, the post-eruption lava dome inside and Crater Glacier surrounding the lava dome. The small photo on the left was taken from Spirit Lake before the eruption and the small photo on the right was taken after the eruption from approximately the same place. Spirit Lake can also be seen in the larger image, as well as two other Cascade volcanoes. Contents 1 Build - up to the eruption 2 Landslide and eruption 3 Pyroclastic flows 3.1 Initial lateral blast 3.2 Lateral blast result 3.3 Later flows 4 Ash column 5 Ash properties 5.1 Chemical composition 5.2 Index of refraction 6 Mudslides flow downstream 7 Aftermath 7.1 Direct results 7.1. 1 Disputed death toll 7.2 Ash damage and removal 7.3 Cost 8 Later eruptions 8.1 1980 -- 1991 8.2 2004 -- 2008 9 Summary table 10 See also 11 Notes 12 References 13 Further reading 14 External links Build - up to the eruption Mount St. Helens remained dormant from its last period of activity in the 1840s and 1850s until March 1980. Several small earthquakes, apparently beginning on March 15, indicated that magma may have begun moving below the volcano. On March 20, at 3 : 45 p.m. Pacific Standard Time ( all times will be in PST or PDT ), a shallow magnitude 4.2 earthquake ( the initial reading was 4.1 ), centered below the volcano 's north flank, signaled the volcano 's violent return from 123 years of hibernation. A gradually building earthquake swarm saturated area seismographs and started to climax at about noon on March 25, reaching peak levels in the next two days, including an earthquake registering 5.1 on the Richter scale. A total of 174 shocks of magnitude 2.6 or greater were recorded during those two days. USGS photo showing a pre-avalanche eruption on April 10 Shocks of magnitude 3.2 or greater occurred at a slightly increasing rate during April and May with five earthquakes of magnitude 4 or above per day in early April, and eight per day the week before May 18. Initially there was no direct sign of eruption, but small earthquake - induced avalanches of snow and ice were reported from aerial observations. At 12 : 36 p.m. on March 27, phreatic eruptions ( explosions of steam caused by magma suddenly heating groundwater ) ejected and smashed rock from within the old summit crater, excavating a new crater 250 feet ( 75 m ) wide and sending an ash column about 7,000 feet ( 2,100 m ) into the air. By this date a 16,000 - foot - long ( 4,900 m ) eastward - trending fracture system had also developed across the summit area. This was followed by more earthquake swarms and a series of steam explosions that sent ash 10,000 to 11,000 feet ( 3,000 to 3,400 m ) above their vent. Most of this ash fell between 3 and 12 miles ( 5 and 19 km ) from its vent, but some was carried 150 miles ( 240 km ) south to Bend, Oregon, or 285 miles ( 459 km ) east to Spokane, Washington. Photo showing the cryptodome on April 27 A second, new crater and a blue flame were observed on March 29. The flame was visibly emitted from both craters and was probably created by burning gases. Static electricity generated from ash clouds rolling down the volcano sent out lightning bolts that were up to 2 miles ( 3 km ) long. Ninety - three separate outbursts were reported on March 30, and increasingly strong harmonic tremors were first detected on April 1, alarming geologists and prompting Governor Dixy Lee Ray to declare a state of emergency on April 3. Governor Ray issued an executive order on April 30 creating a `` red zone '' around the volcano ; anyone caught in this zone without a pass faced a $500 fine or six months in jail. This precluded many cabin owners from visiting their property. By April 7 the combined crater was 1,700 feet long by 1,200 ft wide and 500 ft deep ( 520 × 370 × 150 m ). A USGS team determined in the last week of April that a 1.5 - mile - diameter ( 2.4 km ) section of St. Helens ' north face was displaced outward by at least 270 feet ( 82 m ). For the rest of April and early May this bulge grew by 5 to 6 feet ( 1.5 to 1.8 m ) per day, and by mid-May it extended more than 400 feet ( 120 m ) north. As the bulge moved northward, the summit area behind it progressively sank, forming a complex, down - dropped block called a graben. Geologists announced on April 30 that sliding of the bulge area was the greatest immediate danger and that such a landslide might spark an eruption. These changes in the volcano 's shape were related to the overall deformation that increased the volume of the volcano by 0.03 cubic miles ( 0.13 km ) by mid-May. This volume increase presumably corresponded to the volume of magma that pushed into the volcano and deformed its surface. Because the intruded magma remained below ground and was not directly visible, it was called a cryptodome, in contrast to a true lava dome exposed at the surface. On May 7, eruptions similar to those in March and April resumed, and over the next days the bulge approached its maximum size. All activity had been confined to the 350 - year - old summit dome and did not involve any new magma. A total of about 10,000 earthquakes were recorded prior to the May 18 event, with most concentrated in a small zone less than 1.6 miles ( 2.6 km ) directly below the bulge. Visible eruptions ceased on May 16, reducing public interest and consequently the number of spectators in the area. Mounting public pressure then forced officials to allow 50 carloads of property owners to enter the danger zone on May 17 to gather whatever property they could carry. Another trip was scheduled for 10 a.m. the next day. Because that next day was Sunday, more than 300 loggers would not be working in the area. By the time of the climactic eruption, dacite magma intruding into the volcano had forced the north flank outward nearly 500 feet ( 150 m ) and heated the volcano 's groundwater system, causing many steam - driven explosions ( phreatic eruptions ). Landslide and eruption Sequence of events on May 18. Lakes nearest to Mount St. Helens have been partly covered with felled trees for more than thirty years. This photograph was taken in 2012. As May 18 dawned, Mount St. Helens ' activity did not show any change from the pattern of the preceding month. The rate of bulge movement, sulfur dioxide emission, and ground temperature readings did not reveal any changes indicating a catastrophic eruption. USGS volcanologist David A. Johnston was on duty at an observation post approximately 6 miles ( 10 km ) north of the volcano : as of 6 a.m., Johnston 's measurements did not indicate any unusual activity. Sound of the eruption of Mount St. Helens, as heard from 140 miles away Amateur recording of a series of booms produced by the eruption, as heard from the town of Newport, Oregon ( audio filtered and amplified ). Problems playing this file ? See media help. Suddenly, at 8 : 32 a.m., a magnitude 5.1 earthquake centered directly below the north slope triggered that part of the volcano to slide, approximately 7 -- 20 seconds ( about 10 seconds seems most reasonable ) after the shock. The landslide, the largest in recorded history, travelled at 110 to 155 miles per hour ( 177 to 249 km / h ) and moved across Spirit Lake 's west arm. Part of it hit a 1,150 - foot - high ( 350 m ) ridge about 6 miles ( 10 km ) north. Some of the slide spilled over the ridge, but most of it moved 13 miles ( 21 km ) down the North Fork Toutle River, filling its valley up to 600 feet ( 180 m ) deep with avalanche debris. An area of about 24 square miles ( 62 km ) was covered, and the total volume of the deposit was about 0.7 cubic miles ( 2.9 km ). North Fork Toutle River valley filled with landslide deposits Scientists were able to reconstruct the motion of the landslide from a series of rapid photographs by Gary Rosenquist, who was camping 11 miles ( 18 km ) away from the blast. Rosenquist, his party and his photographs survived because the blast was deflected by local topography 1 mile ( 1.6 km ) short of his location. Most of St. Helens ' former north side became a rubble deposit 17 miles ( 27 km ) long, averaging 150 feet ( 46 m ) thick ; the slide was thickest at 1 mile ( 1.6 km ) below Spirit Lake and thinnest at its western margin. Thousands of trees were torn from the surrounding hillside after the lake was sloshed 800 feet ( 240 m ) up the hillside. All the water in Spirit Lake was temporarily displaced by the landslide, sending 600 - foot - high ( 180 m ) waves crashing into a ridge north of the lake, adding 295 feet ( 90 m ) of new avalanche debris above the old lakebed, and raising its surface level by about 200 feet. As the water moved back into its basin, it pulled with it thousands of trees felled by a super-heated wall of volcanic gas and searing ash and rock that had overtaken the landslide seconds before. More than three decades after the eruption, mats of floating dead trees remain on Spirit Lake and nearby St. Helens Lake ; the mats change position with the wind. Pyroclastic flows Initial lateral blast The ash cloud produced by the eruption, as seen from the village of Toledo, Washington, 35 miles ( 56 km ) away, northwest from Mount St. Helens. The cloud was roughly 40 miles ( 64 km ) wide and 15 miles ( 24 km ) high. Computer graphic showing the May 18 landslide ( green ) being overtaken by the initial pyroclastic flow ( red ). The landslide exposed the dacite magma in St. Helens ' neck to much lower pressure, causing the gas - charged, partially molten rock and high - pressure steam above it to explode a few seconds after the landslide started. Explosions burst through the trailing part of the landslide, blasting rock debris northward. The resulting blast laterally directed the pyroclastic flow of very hot volcanic gases, ash and pumice formed from new lava, while the pulverized old rock hugged the ground, initially moving at 220 miles per hour ( 350 km / h ) but quickly accelerating to 670 mph ( 1,080 km / h ), and it might have briefly passed the speed of sound. Pyroclastic flow material passed over the moving avalanche and spread outward, devastating a fan - shaped area 23 miles across by 19 miles long ( 37 km × 31 km ). In total about 230 square miles ( 600 km ) of forest was knocked down, and extreme heat killed trees miles beyond the blow - down zone. At its vent the lateral blast probably did not last longer than about 30 seconds, but the northward - radiating and expanding blast cloud continued for about another minute. Superheated flow material flashed water in Spirit Lake and North Fork Toutle River to steam, creating a larger, secondary explosion that was heard as far away as British Columbia, Montana, Idaho, and Northern California. Yet many areas closer to the eruption ( Portland, Oregon, for example ) did not hear the blast. This so - called `` quiet zone '' extended radially a few tens of miles from the volcano and was created by the complex response of the eruption 's sound waves to differences in temperature and air motion of the atmospheric layers and, to a lesser extent, local topography. Later studies indicated that one - third of the 0.045 cubic miles ( 0.19 km ) of material in the flow was new lava, and the rest was fragmented, older rock. Lateral blast result Photographer Reid Blackburn 's car after the eruption Many trees in the Direct blast zone were snapped off at their bases and the earth was stripped and scorched. Residual lateral blast effects in the channelized blast zone, some thirty years after the eruption. Damage ranged from scorched earth, through tree trunks snapped at various heights, to more superficial effects. Everyone in the quiet zone could see the huge ash cloud that was sent skyward from St. Helens ' northern foot. The near - supersonic lateral blast, loaded with volcanic debris, caused devastation as far as 19 miles ( 31 km ) from the volcano. The area affected by the blast can be subdivided into three roughly concentric zones : Direct blast zone, the innermost zone, averaged about 8 miles ( 13 km ) in radius, an area in which virtually everything, natural or artificial, was obliterated or carried away. For this reason, this zone also has been called the `` tree - removal zone ''. The flow of the material carried by the blast was not deflected by topographic features in this zone. The blast released energy equal to 24 Megatons of TNT. Channelized blast zone, an intermediate zone, extended out to distances as far as 19 miles ( 31 km ) from the volcano, an area in which the flow flattened everything in its path and was channeled to some extent by topography. In this zone, the force and direction of the blast are strikingly demonstrated by the parallel alignment of toppled large trees, broken off at the base of the trunk as if they were blades of grass mown by a scythe. This zone was also known as the `` tree - down zone ''. Channeling and deflection of the blast caused strikingly varied local effects that still remained conspicuous after some decades. Where the blast struck open land directly, it scoured it, breaking trees off short and stripping vegetation and even topsoil, thereby delaying revegetation for many years. Where the blast was deflected so as to pass overhead by several metres, it left the topsoil and the seeds it contained, permitting faster revegetation with scrub and herbaceous plants, and later with saplings. Trees in the path of such higher - level blasts were broken off wholesale at various heights, whereas nearby stands in more sheltered positions recovered comparatively rapidly without conspicuous long - term harm. Seared zone, also called the `` standing dead '' zone, the outermost fringe of the impacted area, a zone in which trees remained standing but were singed brown by the hot gases of the blast. By the time this pyroclastic flow hit its first human victims, it was still as hot as 360 ° C ( 680 ° F ) and filled with suffocating gas and flying angular material. Most of the 57 people known to have died in that day 's eruption succumbed to asphyxiation while several died from burns. Lodge owner Harry R. Truman was buried under hundreds of feet of avalanche material. Volcanologist David A. Johnston was one of those killed, as was Reid Blackburn, a National Geographic photographer. Robert Landsburg, another photographer, was killed by the ash cloud. He was able to protect his film with his body, and the surviving photos provided geologists with valuable documentation of the historic eruption. Later flows Subsequent outpourings of pyroclastic material from the breach left by the landslide consisted mainly of new magmatic debris rather than fragments of preexisting volcanic rocks. The resulting deposits formed a fan - like pattern of overlapping sheets, tongues and lobes. At least 17 separate pyroclastic flows occurred during the May 18 eruption, and their aggregate volume was about 0.05 cubic miles ( 210,000,000 m ). The flow deposits were still at about 300 to 420 ° C ( 572 to 788 ° F ) two weeks after they erupted. Secondary steam - blast eruptions fed by this heat created pits on the northern margin of the pyroclastic - flow deposits, at the south shore of Spirit Lake, and along the upper part of the North Fork Toutle River. These steam - blast explosions continued sporadically for weeks or months after the emplacement of pyroclastic flows, and at least one occurred a year later, on May 16, 1981. Ash column Ash cloud from Mt St Helens as captured by the GOES 3 weather satellite at 15 : 45 UTC As the avalanche and initial pyroclastic flow were still advancing, a huge ash column grew to a height of 12 miles ( 19 km ) above the expanding crater in less than 10 minutes and spread tephra into the stratosphere for 10 straight hours. Near the volcano, the swirling ash particles in the atmosphere generated lightning, which in turn started many forest fires. During this time, parts of the mushroom - shaped ash - cloud column collapsed, and fell back upon the earth. This fallout, mixed with magma, mud and steam, sent additional pyroclastic flows speeding down St. Helens ' flanks. Later, slower flows came directly from the new north - facing crater and consisted of glowing pumice bombs and very hot pumiceous ash. Some of these hot flows covered ice or water which flashed to steam, creating craters up to 65 feet ( 20 m ) in diameter and sending ash as much as 6,500 feet ( 2,000 m ) into the air. Strong high - altitude wind carried much of this material east - northeasterly from the volcano at an average speed of about 60 miles per hour ( 97 km / h ). By 9 : 45 a.m. it had reached Yakima, Washington, 90 miles ( 140 km ) away, and by 11 : 45 a.m. it was over Spokane, Washington. A total of 4 to 5 inches ( 100 to 130 mm ) of ash fell on Yakima, and areas as far east as Spokane were plunged into darkness by noon where visibility was reduced to 10 feet ( 3.0 m ) and 0.5 inches ( 13 mm ) of ash fell. Continuing eastward, St. Helens ' ash fell in the western part of Yellowstone National Park by 10 : 15 p.m. and was seen on the ground in Denver, Colorado, the next day. In time, ash fall from this eruption was reported as far away as Minnesota and Oklahoma, and some of the ash drifted around the globe within about 2 weeks. During the nine hours of vigorous eruptive activity, about 540,000,000 tons of ash fell over an area of more than 22,000 square miles ( 57,000 km ). The total volume of the ash before its compaction by rainfall was about 0.3 cubic miles ( 1.3 km ). The volume of the uncompacted ash is equivalent to about 0.05 cubic miles ( 210,000,000 m ) of solid rock, or about 7 % of the amount of material that slid off in the debris avalanche. By around 5 : 30 p.m. on May 18, the vertical ash column declined in stature, but less severe outbursts continued through the next several days. Ash properties Generally, given that the way airborne ash is deposited after an eruption is strongly influenced by the meteorological conditions, a certain variation of the ash type will occur, as a function of distance to the volcano or time elapsed from eruption. The ash from Mount St. Helens is no exception, and hence the ash properties have large variations. Chemical composition The bulk chemical composition of the ash has been found to be approximately 65 % silicon dioxide, 18 % aluminium oxide, 5 % ferric oxide, 4 % each calcium oxide and sodium oxide and 2 % magnesium oxide. Trace chemicals were also detected, their concentrations varying as shown : 0.05 -- 0.09 % chlorine, 0.02 -- 0.03 % fluorine, and 0.09 -- 0.3 % sulphur. Index of refraction The index of refraction, a number used in physics to describe how light propagates through a particular substance, is an important property of volcanic ash. This number is complex having both real and imaginary parts, the real part indicating how light disperses and the imaginary part indicating how light is absorbed by the substance. It is known that the silicate particles have a real index of refraction ranging between 1.5 and 1.6 for visible light. However, there is a spectrum of colors associated with samples of volcanic ash, from very light to dark gray. This makes for variations in the measured imaginary refractive index under visible light. In the case of Mount St. Helens, the ash settled in three main layers on the ground : the bottom layer was dark gray and was found to be abundant in older rocks and crystal fragments the middle layer consisted of a mixture of glass shards and pumice the top layer was ash consisting of very fine particles For example, when comparing the imaginary part of the refractive index k of stratospheric ash from 15 km and 18 km from the volcano it has been discovered that they have similar values around 700 nm ( around 0.009 ), while they differ significantly around 300 nm. Here, the 18 km ( k was found to be around 0.009 ) sample was much more absorbent than the 15 km sample ( k was found to be around 0.002 ). Mudslides flow downstream Mudline next to Muddy River from the 1980 lahars The hot, exploding material also broke apart and melted nearly all of the mountain 's glaciers along with most of the overlying snow. As in many previous St. Helens ' eruptions, this created huge lahars ( volcanic mudflows ) and muddy floods that affected three of the four stream drainage systems on the mountain, and which started to move as early as 8 : 50 a.m. Lahars travelled as fast as 90 miles per hour ( 140 km / h ) while still high on the volcano but progressively slowed to about 3 miles per hour ( 4.8 km / h ) on the flatter and wider parts of rivers. Mudflows from the southern and eastern flanks had the consistency of wet concrete as they raced down Muddy River, Pine Creek and Smith Creek to their confluence at the Lewis River. Bridges were taken out at the mouth of Pine Creek and the head of Swift Reservoir, which rose 2.6 feet ( 0.79 m ) by noon to accommodate the nearly 18,000,000 cubic yards ( 14,000,000 m ) of additional water, mud and debris. Glacier and snow melt mixed with tephra on the volcano 's northeast slope to create much larger lahars. These mudflows traveled down the north and south forks of the Toutle River and joined at the confluence of the Toutle forks and the Cowlitz River near Castle Rock, Washington, at 1 : 00 p.m. Ninety minutes after the eruption, the first mudflow had moved 27 miles ( 43 km ) upstream where observers at Weyerhaeuser 's Camp Baker saw a 12 - foot - high ( 4 m ) wall of muddy water and debris pass. Near the confluence of the Toutle 's north and south forks at Silver Lake, a record flood stage of 23.5 feet ( 7.2 m ) was recorded. A large but slower - moving mudflow with a mortar - like consistency was mobilized in early afternoon at the head of the Toutle River north fork. By 2 : 30 p.m. the massive mudflow had destroyed Camp Baker, and in the following hours seven bridges were carried away. Part of the flow backed up for 2.5 miles ( 4.0 km ) soon after entering the Cowlitz River, but most continued downstream. After traveling 17 miles ( 27 km ) further, an estimated 3,900,000 cubic yards ( 3,000,000 m ) of material were injected into the Columbia River, reducing the river 's depth by 25 feet ( 8 m ) for a 4 - mile ( 6 km ) stretch. The resulting 13 - foot ( 4.0 m ) river depth temporarily closed the busy channel to ocean - going freighters, costing Portland, Oregon, an estimated five million US dollars. Ultimately more than 65 million cubic yards ( 50 million cubic metres ) of sediment were dumped along the lower Cowlitz and Columbia Rivers. Aftermath Direct results Map showing 1980 eruption deposits The May 18, 1980, event was the most deadly and economically destructive volcanic eruption in the history of the United States. Approximately fifty - seven people were killed directly from the blast and 200 houses, 47 bridges, 15 miles ( 24 km ) of railways and 185 miles ( 298 km ) of highway were destroyed ; two people were killed indirectly in accidents that resulted from poor visibility, and two more suffered fatal heart attacks from shoveling ash. U.S. President Jimmy Carter surveyed the damage and said it looked more desolate than a moonscape. A film crew was dropped by helicopter on Mount St. Helens on May 23 to document the destruction. However, their compasses spun in circles and they quickly became lost. A second eruption occurred the next day ( see below ), but the crew survived and were rescued two days after that. The eruption ejected more than 1 cubic mile ( 4.2 km ) of material. A quarter of that volume was fresh lava in the form of ash, pumice and volcanic bombs while the rest was fragmented, older rock. The removal of the north side of the mountain ( 13 % of the cone 's volume ) reduced Mount St. Helens ' height by about 1,280 feet ( 390 m ) and left a crater 1 to 2 miles ( 2 to 3 km ) wide and 2,100 feet ( 640 m ) deep with its north end open in a huge breach. Mount St. Helens one day before the eruption, photographed from the Johnston ridge Mount St. Helens four months after the eruption, photographed from approximately the same location as the earlier picture More than 4,000,000,000 board feet ( 9,400,000 m ) of timber was damaged or destroyed, mainly by the lateral blast. At least 25 % of the destroyed timber was salvaged after September 1980. Downwind of the volcano, in areas of thick ash accumulation, many agricultural crops, such as wheat, apples, potatoes and alfalfa, were destroyed. As many as 1,500 elk and 5,000 deer were killed, and an estimated 12 million Chinook and Coho salmon fingerlings died when their hatcheries were destroyed. Another estimated 40,000 young salmon were lost when they swam through turbine blades of hydroelectric generators after reservoir levels were lowered along the Lewis River to accommodate possible mudflows and flood waters. In total Mount St. Helens released 24 megatons of thermal energy, 7 of which were a direct result of the blast. This is equivalent to 1,600 times the size of the atomic bomb dropped on Hiroshima. Disputed death toll There is a minor controversy in regard to the exact death toll. The figure most commonly cited is fifty - seven. However, there are two points of dispute. The first point regards two officially listed victims, Paul Hiatt and Dale Thayer. They were reported missing after the explosion. In the aftermath, investigators were able to locate individuals named Paul Hiatt and Dale Thayer who were alive and well. However, they were unable to determine who reported Hiatt missing, and the person who was listed as reporting Thayer missing claimed she was n't the one who had done so. Since the investigators could not thus verify that they were the same Hiatt and Thayer who were reported missing, the names remain listed among the presumed dead. The second point regards three missing people who are not officially listed as victims : Robert Ruffle, Steven Whitsett and Mark Melanson. Cowlitz County Emergency Services Management lists them as `` Possibly Missing -- Not on ( the official ) List ''. According to Melanson 's brother, in October 1983, Cowlitz County officials told his family that Melanson `` is believed (... ) a victim of the May 18, 1980, eruption '' and that after years of searching, the family eventually decided `` he 's buried in the ash ''. Taking these two points of dispute into consideration, the direct death toll could be as low as fifty - five or as high as sixty. When combined with the four indirect victims mentioned earlier, those numbers range from fifty - nine to sixty - four. Ash damage and removal Map of ash distribution over the United States The ash fall created some temporary major problems with transportation, sewage disposal, and water treatment systems. Visibility was greatly decreased during the ash fall, closing many highways and roads. Interstate 90 from Seattle to Spokane was closed for a week and a half. Air travel was disrupted for between a few days and two weeks, as several airports in eastern Washington shut down because of ash accumulation and poor visibility. Over a thousand commercial flights were cancelled following airport closures. Fine - grained, gritty ash caused substantial problems for internal - combustion engines and other mechanical and electrical equipment. The ash contaminated oil systems and clogged air filters, and scratched moving surfaces. Fine ash caused short circuits in electrical transformers, which in turn caused power blackouts. Removing and disposing of the ash was a monumental task for some Eastern Washington communities. State and federal agencies estimated that over 2,400,000 cubic yards ( 1,800,000 m ) of ash, equivalent to about 900,000 tons in weight, were removed from highways and airports in Washington. The ash removal cost $2.2 million and took 10 weeks in Yakima. The need to remove ash quickly from transport routes and civil works dictated the selection of some disposal sites. Some cities used old quarries and existing sanitary landfills ; others created dump sites wherever expedient. To minimize wind reworking of ash dumps, the surfaces of some disposal sites were covered with topsoil and seeded with grass. In Portland, the mayor eventually threatened businesses with fines if they failed to remove the ash from their parking lots. Cost One of the 200 houses destroyed by the eruption A refined estimate of $1.1 billion ( $2.74 billion in 2007 dollars ) was determined in a study by the International Trade Commission at the request of the United States Congress. A supplemental appropriation of $951 million for disaster relief was voted by Congress, of which the largest share went to the Small Business Administration, U.S. Army Corps of Engineers and the Federal Emergency Management Agency. There were also indirect and intangible costs of the eruption. Unemployment in the immediate region of Mount St. Helens rose tenfold in the weeks immediately following the eruption, and then returned to near - normal levels once timber - salvaging and ash - cleanup operations were underway. Only a small percentage of residents left the region because of lost jobs owing to the eruption. Several months after May 18, a few residents reported suffering stress and emotional problems, even though they had coped successfully during the crisis. Counties in the region requested funding for mental health programs to assist such people. Initial public reaction to the May 18 eruption dealt a nearly crippling blow to tourism, an important industry in Washington. Not only was tourism down in the Mount St. Helens -- Gifford Pinchot National Forest area, but conventions, meetings and social gatherings also were cancelled or postponed at cities and resorts elsewhere in Washington and neighboring Oregon not affected by the eruption. The adverse effect on tourism and conventioneering, however, proved only temporary. Mount St. Helens, perhaps because of its reawakening, has regained its appeal for tourists. The United States Forest Service and the State of Washington opened visitor centers and provided access for people to view the volcano 's devastation. Later eruptions St. Helens produced an additional five explosive eruptions between May and October 1980. Through early 1990 at least 21 periods of eruptive activity had occurred. The volcano remains active, with smaller, dome - building eruptions continuing into 2008. 1980 -- 1991 Eruption on July 22, 1980 An eruption occurred on May 25, 1980, at 2 : 30 a.m. that sent an ash column 9 miles ( 14 km ) into the atmosphere. The eruption was preceded by a sudden increase in earthquake activity and occurred during a rainstorm. Erratic wind from the storm carried ash from the eruption to the south and west, lightly dusting large parts of western Washington and Oregon. Pyroclastic flows exited the northern breach and covered avalanche debris, lahars and other pyroclastic flows deposited by the May 18 eruption. At 7 : 05 p.m. on June 12, a plume of ash billowed 2.5 miles ( 4.0 km ) above the volcano. At 9 : 09 p.m. a much stronger explosion sent an ash column about 10 miles ( 16 km ) skyward. This event caused the Portland area, previously spared by wind direction, to be thinly coated with ash in the middle of the annual Rose Festival. A dacite dome then oozed into existence on the crater floor, growing to a height of 200 feet ( 61 m ) and a width of 1,200 feet ( 370 m ) within a week. A series of large explosions on July 22 broke more than a month of relative quiet. The July eruptive episode was preceded by several days of measurable expansion of the summit area, heightened earthquake activity, and changed emission rates of sulfur dioxide and carbon dioxide. The first hit at 5 : 14 p.m. as an ash column shot 10 miles ( 16 km ) and was followed by a faster blast at 6 : 25 p.m. that pushed the ash column above its previous maximum height in just 7.5 minutes. The final explosion started at 7 : 01 p.m. and continued for over two hours. When the relatively small amount of ash settled over eastern Washington, the dome built in June was gone. The growing third dome on October 24, 1980 Seismic activity and gas emission steadily increased in early August, and on August 7 at 4 : 26 p.m., an ash cloud slowly expanded 8 miles ( 13 km ) into the sky. Small pyroclastic flows came through the northern breach and a weaker outpouring of ash rose from the crater. This continued until 10 : 32 p.m. when a second large blast sent ash high into the air, proceeding due north. A second dacite dome filled this vent a few days later. Two months of repose were ended by an eruption lasting from October 16 to 18. This event obliterated the second dome, sent ash 10 miles ( 16 km ) in the air and created small, red - hot pyroclastic flows. A third dome began to form within 30 minutes after the final explosion on October 18, and within a few days, it was about 900 feet ( 270 m ) wide and 130 feet ( 40 m ) high. In spite of the dome growth next to it, a new glacier formed rapidly inside the crater. All of the post-1980 eruptions were quiet dome - building events, beginning with the December 27, 1980, to January 3, 1981, episode. By 1987 the third dome had grown to be more than 3,000 feet ( 910 m ) wide and 800 feet ( 240 m ) high. Further eruptions occurred over a few months between 1989 and 1991. Plume of volcanic ash and steam in October 2004 eruption 2004 -- 2008 Main article : 2004 -- 08 volcanic activity of Mount St. Helens The 2004 -- 08 volcanic activity of Mount St. Helens has been documented as a continuous eruption with a gradual extrusion of magma at the Mount St. Helens volcano. Starting in October 2004 there was a gradual building of a new lava dome. The new dome did not rise above the caldera created by the 1980 eruption. This activity lasted until January 2008. Summary table Eruption summary May 18, 1980, eruption of Mount St. Helens Elevation of summit : Before eruption : 9,677 ft ( 2,950 m ) After eruption : 8,363 ft ( 2,549 m ) Total removed : 1,314 ft ( 401 m ) Crater dimensions : East - West : 1.2 mi ( 1.9 km ) North - South : 1.8 mi ( 2.9 km ) Depth : 2,084 ft ( 635 m ) Crater floor elevation : 6,279 ft ( 1,914 m ) Eruption Date : May 18, 1980 Time of initial blast : 8 : 32 a.m. Pacific Daylight Time ( UTC − 7 ) Eruption trigger : A magnitude 5.1 earthquake about 1 mi ( 1.6 km ) beneath the volcano Landslide and debris avalanche Area covered : 23 sq mi ( 60 km ) Volume : ( uncompacted deposits ) 0.67 cu mi ( 2.8 km ) Depth of deposit : Buried North Fork Toutle River to average depth of 150 ft ( 46 m ) with a maximum depth of 600 ft ( 183 m ) Velocity : 70 to 150 mph ( 113 to 241 km / h ) Lateral blast Area covered : 230 sq mi ( 596 km ) ; reached 17 mi ( 27 km ) northwest of the crater Volume of deposit : ( uncompacted deposits ) 0.046 cu mi ( 0.19 km ) Depth of deposit : From about 3 ft ( 1 m ) at volcano to less than 1 in ( 2.5 cm ) at blast edge Velocity : At least 300 mph ( 483 km / h ) Temperature : As high as 660 ° F ( 349 ° C ) Energy release : 24 megatons thermal energy ( 7 by blast, rest through release of heat ) Trees blown down : 4,000,000,000 board feet ( 9,400,000 m ) of timber ( enough to build about 300,000 two - bedroom homes ) Human fatalities : 55 - 60 ( direct ) ; 4 ( indirect ) ; 59 - 64 ( total ) Lahars Velocity : About 10 to 25 mph ( 16 to 40 km / h ) and over 50 mph ( 80 km / h ) on steep flanks of volcano Damaged : 27 bridges, nearly 200 homes. Blast and lahars destroyed more than 185 mi ( 298 km ) of highways and roads and 15 mi ( 24 km ) of railways. Effects on Cowlitz River : Reduced carrying capacity at flood stage at Castle Rock from 76,000 cu ft ( 2,200 m ) per second to less than 15,000 cu ft ( 420 m ) per second. Effects on Columbia River : Reduced channel depth from 40 to 14 ft ( 12 to 4 m ) ; stranded 31 ships in upstream ports Eruption column and cloud Height : Reached about 80,000 ft ( 24,400 m ) in less than 15 minutes Downwind extent : Spread across U.S. in 3 days ; circled Earth in 15 days Volume of ash : ( based on uncompacted deposits ) 0.26 cu mi ( 1.1 km ) Ash fall area : Detectable amounts of ash covered 22,000 sq mi ( 57,000 km ) Ash fall depth : 10 in ( 25 cm ) at 10 mi ( 16 km ) downwind ( ash and pumice ) 1 in ( 2.5 cm ) at 60 mi ( 97 km ) downwind 0.5 in ( 1.3 cm ) at 300 mi ( 482.8 km ) downwind Pyroclastic flows Area covered : 6 sq mi ( 16 km ) ; reached as far as 5 mi ( 8 km ) north of crater Volume and depth : ( volume based on uncompacted deposits ) 0.029 cu mi ( 0.12 km ) ; multiple flows 3 to 30 ft ( 1 to 9 m ) thick ; cumulative depth of deposits reached 120 ft ( 37 m ) in places Velocity : Estimated at 50 to 80 mph ( 80 to 130 km / h ) Temperature : At least 1,300 ° F ( 700 ° C ) Other Wildlife : The Washington State Department of Game estimated nearly 7,000 big game animals ( deer, elk and bear ) perished as well as all birds and most small mammals. Many burrowing rodents, frogs, salamanders and crawfish managed to survive because they were below ground level or water surface when the disaster struck. Fisheries : The Washington Department of Fisheries estimated that 12 million Chinook and Coho salmon fingerlings were killed when hatcheries were destroyed. Another estimated 40,000 young salmon were lost when forced to swim through turbine blades of hydroelectric generators as reservoir levels along the Lewis River were kept low to accommodate possible mudflows and flooding. Brantley and Myers, 1997, Mount St. Helens -- From the 1980 Eruption to 1996 : USGS Fact Sheet 070 -- 97, accessed 2007 - 06 - 05 ; and Tilling, Topinka, and Swanson, 1990, Eruption of Mount St. Helens -- Past, Present, and Future : USGS General Interest Publication, accessed 2007 - 06 - 05. Table compiled by Lyn Topinka, USGS / CVO, 1997 See also Cascade Volcanoes -- High Cascades. List of Cascade volcanoes Geology of the Pacific Northwest Pacific Ring of Fire The Eruption of Mount St. Helens ! ( 1980 film ) -- documentary movie about the eruption. Notes This article incorporates public domain material from the United States Geological Survey document : `` Eruptions of Mount St. Helens : Past, Present, and Future ''. Retrieved December 5, 2010. Jump up ^ Fisher, R.V. ; Heiken, G. ; Hulen, J. ( 1998 ). Volcanoes : Crucibles of Change. Princeton University Press. p. 294. Jump up ^ Harden, Blaine ( May 18, 2005 ). `` Explosive Lessons of 25 Years Ago ''. The Washington Post. p. A03. Retrieved 2015 - 02 - 08. Jump up ^ `` Mount Saint Helens Eruption - giph.io ''. giph.io. Retrieved 2017 - 09 - 25. Jump up ^ `` Those who lost their lives because of the May 18, 1980 eruption of Mount St. Helens '' ( PDF ). KGW news. Archived from the original ( PDF ) on May 25, 2009. Jump up ^ As given by `` Inflation Calculator ''. Retrieved December 3, 2015. ^ Jump up to : Tilling, Robert I. ; Topinka, Lyn & Swanson, Donald A. ( 1990 ). `` Eruptions of Mount St. Helens : Past, Present, and Future ''. The Climactic Eruption of May 18, 1980. U.S. Geological Survey ( Special Interest Publication ). Archived from the original on October 26, 2011. Retrieved December 5, 2010. ( adapted public domain text ). Jump up ^ Gorney, Cynthia ( March 31, 1980 ). `` The Volcano : Full Theater, Stuck Curtain ; Hall Packed for Volcano, But the Curtain Is Stuck ''. The Washington Post. ^ Jump up to : `` Mount St. Helens Precursory Activity : March 15 -- 21, 1980 ''. USGS. 2001. Archived from the original on 2012 - 10 - 06. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 202. Jump up ^ Ray, Dewey ( March 27, 1980 ). `` Oregon volcano may be warming up for an eruption ''. Christian Science Monitor. Archived from the original on June 29, 2012. Retrieved October 31, 2010. ^ Jump up to : `` Mount St. Helens Precursory Activity : March 22 -- 28, 1980 ''. United States Geological Survey. 2001. Archived from the original on October 5, 2012. Retrieved June 6, 2015. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 204. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 203. ^ Jump up to : `` Mount St. Helens Precursory Activity : March 29 -- April 4, 1980 ''. United States Geological Survey. 2001. Archived from the original on October 10, 2012. Retrieved June 6, 2015. Jump up ^ `` Mount St. Helens cabin owners angry at ban ''. Spokane Daily Chronicle. May 17, 1980. Jump up ^ `` Mount St. Helens Precursory Activity : April 5 -- 11, 1980 ''. United States Geological Survey. 2001. Archived from the original on October 11, 2012. Retrieved June 6, 2015. ^ Jump up to : `` Reawakening and Initial Activity ''. United States Geological Survey. 1997. Archived from the original on June 9, 2007. Retrieved May 31, 2007. Jump up ^ `` Mount St. Helens Precursory Activity : May 3 -- 9, 1980 ''. USGS. 2001. Archived from the original on 2013 - 02 - 03. Retrieved May 26, 2007. ^ Jump up to : `` Mount St. Helens Precursory Activity : May 10 -- 17, 1980 ''. United States Geological Survey. 2001. Archived from the original on March 12, 2010. Retrieved June 6, 2015. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 205. Jump up ^ Fisher, R.V. ; Heiken, G. ; Hulen, J. ( 1997 ). Volcanoes : Crucibles of Change. Princeton University Press. p. 117. ISBN 0 - 691 - 01213 - X. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 209. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 206. Jump up ^ Robert Coenraads ( 2006 ). `` Natural Disasters and How We Cope '', p. 50. Millennium House, ISBN 978 - 1 - 921209 - 11 - 6. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 208. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 210. ^ Jump up to : Taylor, H.E. ; Lichte, F.E. ( 1980 ). `` Chemical composition of Mount St. Helens volcanic ash ''. Geophysical Research Letters. 7 ( 11 ) : 949 -- 952. doi : 10.1029 / GL007i011p00949. ^ Jump up to : Patterson, E.M. ( 1981 ). `` Measurement of the Imaginary Part of the Refractive Index Between 300 and 700 Nanometers for Mount St. Helens Ash ''. Science. 211 ( 4484 ) : 836 -- 838. doi : 10.1126 / science. 211.4484. 836. Jump up ^ `` What were the effects on people when Mt St Helens erupted ? ''. Oregon State University. Retrieved November 7, 2015. Jump up ^ Patty Murray ( May 17, 2005 ). `` 25th Anniversary of the Mount St. Helens Eruption ''. Congressional Record -- Senate. U.S. Government Printing Office. pp. S5252. Retrieved May 18, 2009. Jump up ^ Egan, Timothy ( June 26, 1988 ). `` Trees Return to St. Helens, But Do They Make a Forest ? ''. The New York Times. p. 1. Retrieved May 18, 2009. Jump up ^ Michael Lienau. `` To Touch a Volcano : A Filmmaker 's Story of Survival ''. Global Net Productions. Archived from the original on May 29, 2011. Retrieved May 19, 2009. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 211. Jump up ^ `` Mount St. Helens -- From the 1980 Eruption to 2000, Fact Sheet 036 - 00 ''. U.S. Geological Survey. Archived from the original on May 12, 2013. Retrieved July 6, 2009. Jump up ^ Slape, Leslie ( April 22, 2005 ). `` Mountain Mystery : Some wonder if fewer people died in 1980 eruption ''. The Daily News. Longview, Washington. Retrieved December 10, 2015. ^ Jump up to : `` Mt. St Helens Victims ''. The Columbian. Retrieved December 10, 2015. Jump up ^ Painter, John Jr. The 1980s. The Oregonian, December 31, 1989. Jump up ^ `` The Federal Reserve Bank of Minneapolis ''. Minneapolisfed.org. Archived from the original on October 7, 2008. Retrieved October 6, 2008. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 212. Jump up ^ `` He Remembers the Year the Mountain Blew ( 1980 ) ''. The Oregonian. Archived from the original on August 29, 2012. Retrieved January 28, 2008. ^ Jump up to : Harris, Fire Mountains of the West ( 1988 ), p. 213. References Harris, Stephen L. ( 1988 ). Fire Mountains of the West : The Cascade and Mono Lake Volcanoes. Missoula, MT : Mountain Press Publishing Company. ISBN 978 - 0 - 87842 - 220 - 3. Tilling, Robert I. ; Topinka, Lyn & Swanson, Donald A. ( 1990 ). `` Eruptions of Mount St. Helens : Past, Present, and Future ''. The Climactic Eruption of May 18, 1980. U.S. Geological Survey. Archived from the original on October 26, 2011. Retrieved December 5, 2010. ( adapted public domain text ) Klimasauskas, Ed ( May 1, 2001 ). `` Mount St. Helens Precursory Activity ''. United States Geological Survey. Archived from the original on October 6, 2012. Retrieved June 6, 2015. Topinka, Lyn. Mount St. Helens : A General Slide Set, Cascades Volcano Observatory, U.S. Geological Survey. Retrieved on 2007 - 05 - 10 Further reading `` Eruption of Mount St. Helens ''. National Geographic. Vol. 159 no. 1. January 1981. pp. 3 -- 65. ISSN 0027 - 9358. OCLC 643483454. Findley, Rowe ( December 1981 ). `` Mount St. Helens Aftermath ''. National Geographic. Vol. 160 no. 6. pp. 713 -- 733. ISSN 0027 - 9358. OCLC 643483454. External links Wikimedia Commons has media related to 1980 eruption of Mount St. Helens. `` List of victims ''. Archived from the original on May 27, 2007. Retrieved 2004 - 12 - 15. CS1 maint : BOT : original - url status unknown ( link ) List of victims with biographical details USGS : Mount St. Helens 1980 Debris Avalanche Deposit USDA Forest Service : Mount St. Helens VolcanoCam Pre-1980 Eruptive History of Mount St. Helens, Washington USGS : Before, During, and After May 18, 1980 Video approximation of the first seconds of the May 18 eruption from Gary Rosenquist 's photos on YouTube Boston.com -- The Big Picture -- 30 years later The short film Eruption of Mount St. Helens, 1980 ( 1981 ) is available for free download at the Internet Archive The short film This place in time : The Mount St. Helens story ( 1984 ) is available for free download at the Internet Archive Aerial pictures of the July 22nd, 1980 secondary eruption News reports at The Museum of Classic Chicago Television Cascade Volcanoes British Columbia Silverthrone Caldera Franklin Glacier Volcano Mount Meager Mount Cayley Mount Garibaldi Washington Mount Baker Black Buttes Glacier Peak Mount Rainier Goat Rocks Mount St. Helens Mount Adams Indian Heaven Oregon Mount Hood Mount Jefferson Three Sisters Broken Top Mount Bachelor Newberry Volcano Diamond Peak Mount Thielsen Mount Mazama ( Crater Lake ) Yamsay Mountain Mount McLoughlin California Medicine Lake Volcano Mount Shasta Mount Tehama Lassen Peak State of Washington Olympia ( capital ) Topics Cities Towns Census - designated places Federal lands Indian reservations History Geography Earthquakes People Music Parks Highways Symbols Tourist attractions Society Culture Crime Demographics Economy Education Politics Politics Government Law Governors Legislature Legislative districts Senate House Legislative initiatives Popular initiatives Congressional delegation Congressional districts City governments State agencies Agriculture Archaeology and Historic Preservation Commerce Corrections Early Learning Ecology Employment Security Enterprise Services Financial Institutions Fish and Wildlife Health Higher Education Coordinating Board Information Services Labor and Industries Licensing Military Natural Resources Parks Institute for Public Policy Public Stadium Authority Public Disclosure Commission Retirement Systems Revenue Services for the Blind Social and Health Services Transportation Utilities and Transportation Regions Western Kitsap Peninsula Long Beach Peninsula Olympic Peninsula Puget Sound San Juan Islands Skagit Valley Eastern / Inland Central Washington Columbia Plateau Methow Valley Okanogan Country Palouse Yakima Valley Shared Cascade Range Columbia Gorge Columbia River Largest cities Seattle Spokane Tacoma Vancouver Bellevue Kent Everett Renton Yakima Federal Way Spokane Valley Kirkland Bellingham Kennewick Auburn Pasco Marysville Lakewood Redmond Shoreline Richland Metropolitan areas Greater Seattle Greater Spokane Tri-Cities Wenatchee metropolitan area Greater Portland and Vancouver Counties Adams Asotin Benton Chelan Clallam Clark Columbia Cowlitz Douglas Ferry Franklin Garfield Grant Grays Harbor Island Jefferson King Kitsap Kittitas Klickitat Lewis Lincoln Mason Okanogan Pacific Pend Oreille Pierce San Juan Skagit Skamania Snohomish Spokane Stevens Thurston Wahkiakum Walla Walla Whatcom Whitman Yakima Modern history of Oregon ( 1890 -- present ) Topics Tax revolt Governors Bottle Bill Centennial Tokens `` Roll On, Columbia, Roll On '' Meier & Frank Willamette Industries Direct Legislation League Events USS Oregon Lewis & Clark Expo Oregon land fraud scandal Lookout Air Raids Columbus Day Storm Exploding whale 1977 NBA Finals 1980 eruption of Mt. 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Lusk Brian McMenamin Bill Naito Steve Prefontaine Jack Ramsay Henry Weinhard History of Oregon 's native peoples of Oregon to 1806 of pioneers in Oregon of Oregon in modern times Coordinates : 46 ° 12 ′ 01 '' N 122 ° 11 ′ 12 '' W ﻿ / ﻿ 46.20028 ° N 122.18667 ° W ﻿ / 46.20028 ; - 122.18667 Retrieved from `` https://en.wikipedia.org/w/index.php?title=1980_eruption_of_Mount_St._Helens&oldid=810889285 '' Categories : 1980 in Idaho 1980 in Montana 1980 in Oregon 1980 in Washington ( state ) 1980 natural disasters in the United States 20th - century volcanic events Cascade Volcanoes Gifford Pinchot National Forest History of the United States ( 1980 -- 91 ) Mount St. Helens Natural disasters in Washington ( state ) Volcanism of Washington ( state ) Landslides in 1980 May 1980 events Megatsunamis Hidden categories : Wikipedia indefinitely move - protected pages Use mdy dates from May 2012 Articles with hAudio microformats Wikipedia articles incorporating text from the United States Geological Survey CS1 maint : BOT : original - url status unknown Featured articles Coordinates on Wikidata Talk Contents About Wikipedia Български Deutsch Ελληνικά Español فارسی Français Bahasa Indonesia Italiano Nederlands Polski Português Română Русский Simple English Suomi Svenska Українська 中文 Edit links This page was last edited on 18 November 2017, at 03 : 05. 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Question: what happened after the mt st helens eruption
Answer: The eruption was preceded by a two-month series of earthquakes and steam-venting episodes, caused by an injection of magma at shallow depth below the volcano that created a large bulge and a fracture system on the mountain's north slope.