Question: Kenji Satake was part of the team that worked on the 1700 earthquake that had what magnitude?

Context paragraphs:
Kenji Satake: Kenji Satake is a Japanese seismologist who has made significant contributions to subduction and tsunami research.  Along with Brian Atwater and David Yamaguchi, Satake assembled disparate pieces of information regarding a Japanese tsunami that had no known origin.  The three scientists worked together to pinpoint a date, time, and location for the 1700 Cascadia earthquake – 9 p.m on January 26, 1700 – on the Cascadia Subduction Zone off the Pacific Northwest coast of North America.

1989 Ungava earthquake: The 1989 Ungava earthquake occurred at 09:24 local time (14:24 UTC) on December 25 to the north of Lac Bécard in a remote part of the Ungava Peninsula in northern Quebec.  It had a magnitude of 6.3 on the surface wave magnitude scale and 6.2–6.5 on the moment magnitude scale and a maximum felt intensity of only IV ("Light") on the Mercalli intensity scale, due to its remoteness from any inhabited areas.  The mainshock was preceded by a magnitude 5.1 foreshock ten hours earlier.  It was the first earthquake in eastern North America known to be associated with ground rupture.

1700 Cascadia earthquake: The 1700 Cascadia earthquake occurred along the Cascadia subduction zone on January 26 with an estimated moment magnitude of 8.7–9.2.  The megathrust earthquake involved the Juan de Fuca Plate that underlies the Pacific Ocean, from mid-Vancouver Island in British Columbia, Canada, south along the Pacific Northwest coast as far as northern California.  The length of the fault rupture was about 1000 km with an average slip of 20 m .

1970 Tonghai earthquake: The 1970 Tonghai earthquake occurred at with a moment magnitude of 7.1 and a maximum Mercalli intensity of X ("Extreme").  The strike-slip rupture originated on the Red River Fault, which had not experienced an earthquake above magnitude 7 since 1700, and affected Tonghai County, Yunnan province, China.  At least 10,000 people were killed, making it one of the deadliest in its decade.  The tremor caused between US$5 to $25 million in damage, felt over an area of 8781 km2 .  In Hanoi, North Vietnam, almost 483 km from the epicenter, victims left their homes as the rupture rumbled through the city.

List of earthquakes in 1950: This is a list of earthquakes in 1950.  Only magnitude 6.0 or greater earthquakes appear on the list.  Lower magnitude events are included if they have caused death, injury or damage.  Events which occurred in remote areas will be excluded from the list as they wouldn't have generated significant media interest.  All dates are listed according to UTC time.  The main event which dominated the year in terms of magnitude and deaths was the earthquake which struck India in August.  With a magnitude of 8.6, it was one of the largest earthquakes of all time, and affected the eastern part of the country.  There were 1,530 deaths, which was around three quarters of the yearly total.  A number of other deadly events struck Colombia, Venezuela and Peru.  There were 21 magnitude 7.0+ quakes.  Aside from India, Chile was hit by a magnitude 8.2 event in December that left one person dead.  Aftershock sequences contributed to a large number of magnitude 6.0–6.9 events, especially in India and Vanuatu (which also saw four magnitude 7.0+ quakes).  Monthly summaries are included for the first time due to a rise in events being recorded and will continue to be featured every year from now.

1838 Vrancea earthquake: The 1838 Vrancea earthquake struck the western part of Vrancea County on 23 January (O.S. 11 January) with a magnitude of 7.5.  The seism caused extensive damage in Moldavia and Wallachia, and killed dozens of people.  The earthquake occurred just 36 years after another earthquake of magnitude over 7 on Richter scale devastated the southern part of Romanian Principalities.

1964 Baihe earthquake: The 1964 Baihe earthquake (), also known as the Great Baihe earthquake, measured 6.3 local magnitude, and occurred at 20:04 CST (UTC+8) on 18 January in Baihe Township of Tainan County (now part of Tainan City), Taiwan.  The hypocenter of the earthquake was 20 kilometers deep.  The earthquake killed 106 people, destroyed 10,924 buildings, and caused a great fire in Jiayi City.  It was the sixth deadliest earthquake in 20th century Taiwan, and the third deadliest post-World War II, after the 921 earthquake and the 2016 Taiwan earthquake

List of earthquakes in 1964: This is a list of earthquakes in 1964.  Only magnitude 6.0 or greater earthquakes appear on the list.  Lower magnitude events are included if they have caused death, injury or damage.  Events which occurred in remote areas will be excluded from the list as they wouldn't have generated significant media interest.  All dates are listed according to UTC time.  Maximum intensities are indicated on the Mercalli intensity scale and are sourced from United States Geological Survey (USGS) ShakeMap data.  Alaska had the largest event of the year both in terms of magnitude and death toll.  In March a great magnitude 9.2 earthquake struck the southern part of the state.  This was the largest earthquake in United States' history and currently as of 2017 ranks as 3rd largest globally.  The quake and subsequent tsunami resulted in 139 deaths in total.  In spite of such a large event there were only 11 other magnitude 7.0 + events which is below normal.  Japan, Taiwan and Mexico had earthquakes which resulted in a number of deaths.  Indonesia and Papua New Guinea experienced high activity this year with a cluster of magnitude 6.0 + events hitting throughout the year.

List of earthquakes in 1960: This is a list of earthquakes in 1960.  Only magnitude 6.0 or greater earthquakes appear on the list.  Lower magnitude events are included if they have caused death, injury or damage.  Events which occurred in remote areas will be excluded from the list as they wouldn't have generated significant media interest.  All dates are listed according to UTC time.  An eventful year in part helped by two significant events.  Firstly, in February the deadliest event of the year struck Morocco with over 13,000 deaths.  The magnitude of the earthquake was a fairly modest 5.8 but its proximity to Agadir attributed to the high death toll.  Secondly, in May a series of large earthquakes rocked central Chile.  Part of the sequence was the largest earthquake of all time on May 22.  The event reached 9.5 in magnitude and helped spawn a destructive tsunami which affected the Pacific Rim.  Aside from this 1960 was active for Peru which had 3 magnitude 7.0+ events.  Japan had a magnitude 8.0 in March.  Iran had a deadly event in April.

1969 Bohai earthquake: The 1969 Bohai earthquake occurred on July 18, 1969, at 13:24 local time.  The epicenter was located in the Bohai Sea, off the coast of Shandong Province, China.  The magnitude of this earthquake is M 7.4.  Areas of maximal intensity were mainly distributed around the estuary of the Yellow River.  Ground cracks and sand boils were reported.  The earthquake could be felt in Liaoning, Hebei, Beijing, Tianjin, Shanxi, Shandong, and Jiangsu.  10 people were reported dead.  This earthquake caused ground surface subsidences of about 15.1 cm ~ 15.8 cm in the Yellow River Delta region.  The mechanism of this earthquake was of dextral strike-slip faulting.  Although it was located near the Tancheng-Lujiang fault zone (郯庐断裂带), some researchers think that this earthquake was dominated by the seaward extending part of the Huanghekou-Liaocheng seismotectonic zone (黄河口-聊城地震构造带).

Supporting paragraphs: Kenji Satake 1700 Cascadia earthquake
Answer: 8.7–9.2