AndreaBozzo/ceres-open-data-index huggingface dataset:
Photogrammetric digital surface models and orthoimagery of Eklutna Lake, December 5, 2018

The State of Alaska Division of Geological & Geophysical Surveys (DGGS) produced digital surface models (DSMs) and orthorectified aerial imagery (orthoimagery) over selected locations in the greater Anchorage area following the Mw 7.1 November 30, 2018, Anchorage earthquake. We selected areas of interest (AOIs) based on initial damage reports from the Alaska Department of Transportation & Public Facilities (DOT&PF) and the United States Geological Survey (USGS) in order to document earthquake effects. Aerial photographs collected December 5-6, 2018, were processed using Structure-from-Motion (SfM) photogrammetric techniques to create sub-meter DSMs and orthoimagery. This digital data set covers Eklutna Lake and was collected on December 5, 2018. These data document ground conditions immediately following the 2018 Mw 7.1 Anchorage earthquake. For the purposes of open access to elevation and orthoimagery data sets throughout Alaska, this collection is being released as a Raw Data File with an open end-user license. The data and the data acquisition report are available from the DGGS website: https://elevation.alaska.gov/, http://doi.org/10.14509/30274.

Tags: aerial photography, anchorage, digital surface model (dsm), earthquake related hazards, earthquake related slope failure, elevation, engineering, fracturing, geologic, geologic hazards, geological process, geology, geomorphology, geotechnical, hazards, orthoimagery, photogrammetry, raster image, structure from motion, surficial geology, topography
Organization: State of Alaska
Surficial geology of the Alaska Highway corridor, Tetlin Junction to Canada border, Alaska

During 2009, the Alaska Division of Geological & Geophysical Surveys continued a program, begun in 2006, of reconnaissance mapping of surficial geology in the proposed natural-gas pipeline corridor through the upper Tanana River valley. The study area is a 12-mi-wide (19.3-km-wide) area that straddles the Alaska Highway from the western boundaries of the Tanacross B-3 and A-3 quadrangles near Tetlin Junction eastward to the eastern boundaries of the Nabesna D-1 and C-1 quadrangles along the Canada border. Mapping during 2008-2009 in the Tanacross and Nabesna quadrangles linked with the mapping completed in the Tanacross, Big Delta and Mt. Hayes quadrangles in 2006-2008. Surficial geology was initially mapped in this third corridor segment by interpreting ~1:65,000-scale, false-color, infrared aerial photographs taken in July 1978 and August 1981 and plotting unit boundaries on acetate overlays. Verification of photo mapping was accomplished during the 2008 and 2009 summer field seasons, when map units were described, soil pits were hand dug, and samples were collected for analyses.

Tags: alaska, alaska highway corridor, alaska range, beaver creek, canada, chisana river, delta glaciation, donnelly glaciation, dunes, eolian, geologic hazards, geologic map, geologic materials, geological process, geology, geomorphology, holocene, midway lake, nabesna, nabesna quadrangle, nabesna river, northway, northway junction, pleistocene, proposed natural gas pipeline, quaternary, remote sensing, scottie creek, state of, surficial, surficial geology, tanacross, tanacross quadrangle, tanana river, tetlin junction, tetlin national wildlife refuge, transportation corridor, unconsolidated deposits
Organization: State of Alaska
Fairbanks electromagnetic and magnetic airborne geophysical survey data compilation

The Fairbanks electromagnetic and magnetic airborne geophysical survey is located in interior Alaska in the Fairbanks mining district, which includes the city of Fairbanks, Alaska. Frequency domain electromagnetic and magnetic data were collected with the DIGHEMV system in August 1994. A total of 4291.0 line kilometers were collected covering 1604 square kilometers. Line spacing was 400 meters (m). Data were collected 30 m above the ground surface from a helicopter towed sensor platform ('bird') on a 30 m long line. The survey data were aquired and/or by Fugro Airborne Surveys, Dighem, WGM Inc., and Stevens Exploration Management Corp. and administered by the Alaska Geological & Geophysical Surveys (DGGS). The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/30230.

Tags: aeromagnetic, aeromagnetic data, aeromagnetic map, aeromagnetic survey, airborne geophysical survey, analytic signal, apparent resistivity data, apparent resistivity map, apparent resistivity survey, chatanika, chatanika river, cleary summit, conductivity survey, electromagnetic data, electromagnetic survey, ester, ester dome, exploration, fairbanks mining district, fairbanks north star borough, first vertical derivative, fort knox mine, frequency domain electromagnetic data, geologic, geology, geophysical map, geophysical survey, geophysics, geophysics search tag, gilmore dome, gold hill, gridded data, line data, magnetic data, magnetic survey, magnetics, murphy dome, pedro dome, remote sensing, resistivity, resistivity survey, true north mine
Organization: State of Alaska
Photogrammetry-derived digital surface model and orthoimagery of Valdez Glacier ice-dammed lake, Valdez, Alaska, October 12, 2016

The State of Alaska Division of Geological & Geophysical Surveys (DGGS) produced a digital surface model (DSM) and an orthorectified aerial image over Valdez Glacier ice-dammed lake in support of glacial lake outburst flood hazard assessment and monitoring. Aerial photographs and Global Navigation Satellite System (GNSS) data were collected on October 12, 2016, and were processed using Structure-from-Motion (SfM) photogrammetric techniques to create orthoimagery and a DSM. The orthoimagery is a four-band, 8-bit unsigned GeoTIFF file. The orthoimagery has a GSD of 0.096 m per pixel, and the "No Data" value is set to 256. All files can be downloaded free of charge from the DGGS website (http://doi.org/10.14509/30200).

Tags: aerial photography, digital elevation model, digital surface model (dsm), elevation, engineering geology, environmental, flood, geologic, geologic hazards, geological process, geology, geomorphology, glacial, glacial geology, glacial geomorphology, glacial lake, glacial processes, glaciation, glacier flood, glacier outburst flood, glaciers, glaciology, ice, ice dam, lake level, lakes, orthoimagery, photogrammetry, structure from motion, valdez
Organization: State of Alaska
Geologic context, age constraints, and sedimentology of a Pleistocene volcaniclastic succession near Mount Spurr volcano, south-central Alaska

A physiographically prominent, approximately 40 square km plateau lies roughly 20 km east of Mount Spurr volcano, northwestern Cook Inlet region, Alaska, and comprises the preserved remnant of a volcaniclastic succession, designated in this study as map unit Qvc. Although this readily mappable package of volcaniclastic rocks has been recognized in numerous studies during the past five decades, uncertainties regarding its age and origin have persisted. We describe the general characteristics of the volcaniclastic plateau, provide new age constraints for deposits, present lithofacies descriptions and interpretations of the volcaniclastic strata, and synthesize our observations and lithofacies analysis to propose an environment of transport and deposition for the unit. This digital data distribution package provides the latitude and longitude coordinates of the field stations noted within the report and a Microsoft Excel file of the U-Pb (LA-ICP-MS) detrital zircon geochronology results tables found in Appendix B of the report.

Tags: age dates, alluvial, alluvial deposits, bedrock, bedrock geology, capps glacier, cenozoic, debris flow, debris flow deposit, depositional environment, depositional environments, detrital zircon, facies analysis, geochronology, geological process, geology, lahar, lahar runout flow, liquefaction, mount spurr, paleoenvironment, paleogeography, pleistocene, quaternary, sediment transport, sedimentary, sedimentary rocks, sedimentation, sedimentology, statemap project, tyonek quadrangle, u-pb, volcaniclastics
Organization: State of Alaska
40Ar/39Ar data, Seward Peninsula, Alaska

This Alaska Division of Geological & Geophysical Surveys (DGGS) Raw Data File presents 40Ar/39Ar age dating results for a volcanic whole-rock sample, selected minerals from various metamorphic rocks and igneous dikes, and white mica from both metamorphic- and hydrothermal-mineralization-related veins encountered on the southern Seward Peninsula, as well as select minerals from one plutonic rock from Cape Denbeigh, eastern Norton Sound, Alaska. Cooling ages on glaucophane, barroisite, amphibole, paragonite, and biotite from metamorphic rocks range from 84 Ma to 209 Ma. The cooling age of white mica in a possible fault zone is 144 Ma. Cooling ages on late-stage metamorphic minerals (winchite and white mica) from veins cutting foliation in metamorphic rocks range from 117 Ma to 139 Ma. Cooling ages on white mica and adularia from hydrothermal mineralization-related veins range from 105 to 131 Ma. The cooling age for one highly alkalic dike is 107 Ma. Cooling ages for younger mafic dikes range from 80 Ma to 84 Ma. The preferred age on a whole-rock sample of basalt is 0.780 +/- 0.011 Ma. Closure and cooling ages on the Cape Denbeigh granite (hornblende, K-feldspar) are 119 Ma and 113 Ma, respectively.

Tags: 40ar/39ar, age dates, ar-ar, bendeleben mountains, bendeleben quadrangle, big hurrah mine, bluff (place), cape denbeigh, council, council mining district, cretaceous, geochronology, jurassic, koyuk mining district, mineral resources, nome, nome mining district, nome quadrangle, norton bay quadrangle, norton sound, quaternary, seward peninsula, solomon quadrangle, statemap project
Organization: State of Alaska
High-resolution lidar data for infrastructure corridors, Big Delta Quadrangle, Alaska

In advance of design, permitting, and construction of a pipeline to deliver North Slope natural gas to out-of-state customers and Alaska communities, the Division of Geological & Geophysical Surveys (DGGS) has acquired lidar (light detection and ranging) data along proposed pipeline routes, nearby areas of infrastructure, and regions where significant geologic hazards have been identified. Lidar data will serve multiple purposes, but have primarily been collected to (1) evaluate active faulting, slope instability, thaw settlement, erosion, and other engineering constraints along proposed pipeline routes, and (2) provide a base layer for the state-federal GIS database that will be used to evaluate permit applications and construction plans. This digital surface model represents coefficient of variation of the above ground height of vegetation returns.

Tags: alaska, alaska highway corridor, alaska pipeline, big delta quadrangle, coefficient variation, gasline, geomorphology, lidar, proposed natural gas pipeline, raster image, remote sensing, state of, trans-alaska pipeline
Organization: State of Alaska
Addendum A: Regional tsunami hazard assessment for Pasagshak, Alaska

Report of Investigation 2019-6A, Addendum A: Regional tsunami hazard assessment for Pasagshak, Alaska, provides an estimated extent of the tsunami hazard zone in the community of Pasagshak, Alaska. Pasagshak is a small community on Kodiak Island, about 70 km (44 mi) south of Kodiak. The highest resolution bathymetric grid that covers this community is the level 3 grid with a grid size of about 45x82 m. We estimate the extent of the tsunami hazard zone in Pasagshak by running all nine tsunami scenarios described in the main report (Report of Investigation 2019-6). Each model run was performed for 12 hours of tsunami propagation to account for all waves in the wave train, including any secondary (reflected) waves. The maximum value of the tsunami height based on a composite of all scenarios, multiplied by a safety factor of 1.3, results in a maximum estimated runup height of 39 m (128 ft) for the community of Pasagshak. We illustrate the maximum estimated tsunami runup on land by drawing an elevation contour on the 5-m (16-ft) resolution community topographic map that corresponds to the maximum modeled wave height offshore. The complete report and digital data are available from the DGGS website: http://doi.org/10.14509/30763.

Tags: active fault, bull lake, coastal, dggs, earthquake, earthquake related slope failure, emergency preparedness, engineering, engineering geology, environmental, fault displacement, faulting, faults, flood, geologic, geologic hazards, geological process, geotechnical, gulf of alaska, hazards, inundation, kodiak island, lake rose teed, land subsidence, landslide, lupin lake, marine, marine geology, modeling, neotectonics, pacific ocean, pasagshak, pasagshak point, seismic hazards, subsidence, surface, topography, tsunami, zenter stream
Organization: State of Alaska
Geologic Map of the Siksikpuk River Area, Chandler Lake Quadrangle, Alaska

During 2004 and 2005 DGGS Energy Section geologists, together with University of Alaska Fairbanks and USGS personnel, conducted 1:63,360-scale geologic mapping in the Siksikpuk River Area of the Chandler Lake B-4 and C-4 quadrangles in northern Alaska. This work was conducted as part of the USGS-funded STATEMAP project, part of the National Cooperative Geologic Mapping Program.

Tags: albian, allochthon, anaktuvuk pass, aptian, carboniferous, cretaceous, endicott mountain allochthon, fortress mountain formation, geologic, geologic map, lisburne group, nanushuk formation, north slope, okpikruak formation, olistostrome, otuk formation, petroleum basin study, siksikpuk formation, siksikpuk river, statemap project, tiglukpuk creek, torok formation
Organization: State of Alaska
Tanana River and Big Delta airborne magnetic and radiometric survey

The Tanana River and Big Delta airborne magnetic and radiometric geophysical survey covers parts of the Big Delta, Charley River, Circle, Eagle, Fairbanks, Kantishna River, Livengood, Mount Hayes, and Tanacross quadrangles near Fairbanks and Delta Junction, Alaska. Magnetic and radiometric data were collected with a fixed-wing aircraft from May 14 to August 4, 2022, by MPX Geophysics LTD. The survey contains six individual blocks. A total of 97,386 line kilometers were collected. The six blocks total 33,095 km2; they cover 32,944 km2 due to overlap. The magnetometer was mounted to a rear-facing fixed boom (tail stinger). The radiometric crystals were located in the cabin of the aircraft. The Tanana, Chena, Healy, Eisen, and North Pole blocks were flown with a line spacing of 400 meters (m). Mean ground clearances were: Tanana, 188 m; Chena, 352 m; Healy, 295 m; Eisen, 430 m; North Pole, 180 m. The Eisen Infill block was flown with a line spacing of 200 m and a mean ground clearance of 422 m. The data, as well as additional metadata, are available from the DGGS website: http://doi.org/10.14509/30899.

Tags: aeromagnetic, aeromagnetic data, aeromagnetic map, aeromagnetic survey, airborne geophysical survey, analytic signal, big delta, big lake, bonnifield mining district, central, charley river, chatanika river, chena hot springs, chena river, circle mining district, cosna, delta river, delta river mining district, dggs, exploration, fairbanks mining district, fort wainwright, fortymile mining district, geologic, geology, geophysical map, geophysical survey, geophysics, geophysics search tag, gerstle river, goodpaster mining district, goodpaster river, gridded data, healy river, hot springs mining district, kantishna mining district, line data, magnetic data, magnetic survey, magnetics, north pole, rampart mining district, remote sensing, richardson, salcha river, tanana river, tatalina river, tatlanika river, tolovana, tolovana mining district, tolovana river, totatlanika river, two rivers, volkmar river, wood river, yukon river, zitziana river
Organization: State of Alaska
High-resolution lidar data for infrastructure corridors, Anchorage Quadrangle, Alaska

In advance of design, permitting, and construction of a pipeline to deliver North Slope natural gas to out-of-state customers and Alaska communities, the Division of Geological & Geophysical Surveys (DGGS) has acquired lidar (Light Detection and Ranging) data along proposed pipeline routes, nearby areas of infrastructure, and regions where significant geologic hazards have been identified. Lidar data will serve multiple purposes, but have primarily been collected to (1) evaluate active faulting, slope instability, thaw settlement, erosion, and other engineering constraints along proposed pipeline routes, and (2) provide a base layer for the state-federal GIS database that will be used to evaluate permit applications and construction plans. The dataset represents ground-classified laser returns from the lidar survey and their associated geospatial coordinates.

Tags: alaska, alaska highway corridor, alaska pipeline, anchorage quadrangle, gasline, geomorphology, lidar, lidar las file format, point cloud data, proposed natural gas pipeline, remote sensing, state of, trans-alaska pipeline
Organization: State of Alaska
Electromagnetic and magnetic airborne-geophysical survey of the Liberty Bell area, western Bonnifield mining district, Alaska (data compilation)

The Liberty Bell geophysical survey was originally flown in 2001 and published in 2002 (Alaska Division of Geological & Geophysical Surveys and others, 2002) as a part of the State of Alaska's Airborne Geophysical/Geological Mineral Inventory (AGGMI) program. This publication supersedes the previous publications to provide a compilation of published and unpublished information and includes standardized databases and product formats, upgrades digital datasets to modern formats, and re-releases the historical survey and associated documentation (http://doi.org/10.14509/29690). This publication contains geophysical data produced from airborne surveys flown from the 24th to 27th of August 2001 for 2,023.6 line kilometers at 400m line spacing in the Bonnifield mining district, Alaska. This DIGHEMV electromagnetic/magnetic survey was flown by Fugro Airborne Surveys Corp. under contract to Stevens Exploration Management Corp.

Tags: aeromagnetic, aeromagnetic data, aeromagnetic map, aeromagnetic survey, airborne geophysical survey, alaska, apparent resistivity data, apparent resistivity map, apparent resistivity survey, bonanza creek, bonnifield mining district, buzzard creek, california creek, chicken creek, coal creek, cody creek, daniels creek, dighem-v em system, digital elevation model, eagle creek, electromagnetic anomalies, electromagnetic data, electromagnetic survey, elsie creek, emma creek, eva creek, fairbanks quadrangle, first vertical derivative, fourth of july creek, geophysical map, geophysical survey, geophysics, geophysics search tag, homestake creek, iron creek, liberty bell mine, little moose creek, lynx creek, magnetics, marguerite creek, mcadam creek, resistivity, resistivity survey, rex creek, rex dome, saint charles creek, spruce creek, state of, steep creek, wilson creek, winter creek
Organization: State of Alaska
Preliminary volcano-hazard assessment for Fisher volcano, Unimak Island, Alaska

Fisher volcano, containing the largest Holocene caldera in the Aleutian volcanic arc, is an active volcano near the center of Unimak Island, about 120 kilometers southwest of Cold Bay and about 175 kilometers northeast of Dutch Harbor. The volcano is composed of numerous small volcanic centers around and within a large, oval caldera 12 by 18 kilometers in diameter and 500 to 1,000 meters deep that formed during a catastrophic eruption about 9,400 years ago. Since then, more than 30 separate vents inside and outside the caldera have erupted; the most recent eruption occurred in 1826. These eruptions have produced lava flows and widespread tephra (volcanic ash) deposits, and have occasionally been accompanied by large floods and lahars. The history of Fisher volcano includes repeated explosive and non-explosive eruptions of varying levels of intensity, and indicates that this pattern will continue in the future. Understanding the variety of potential hazards associated with different types of volcanic processes typical of Fisher volcano can help minimize the adverse effect of future eruptions on humans and infrastructure. This report is part of a series of volcano hazard assessments being prepared by the Alaska Volcano Observatory. The reports are intended to describe the nature of volcanic hazards at Alaska volcanoes and show the extent of hazardous areas with maps, photographs, and other appropriate illustrations. The reports are preliminary and subject to revision as new data become available.

Tags: active volcanoes, aleutian arc, aleutian islands, ash cloud, ash fall, ballistics, caldera, debris flow, fisher, flood, geologic hazards, geothermal, hazards, holocene, lahar, lava flow, pumice, pyroclastic flow, pyroclastic surge, tephra, unimak quadrangle, volcanic ash, volcanic gas, volcaniclastics, volcanology
Organization: State of Alaska
Major-oxide, minor-oxide, trace-element, and geochemical data from rocks collected in 2010 in the Tolovana mining district, Livengood B-3 and B-4 quadrangles, Alaska

Mineral-resources personnel from the Alaska Division of Geological & Geophysical Surveys carried out a geological field survey, including mapping and sampling near Livengood in the Livengood B-3 and B-4 quadrangles, Alaska from June 10 to June 30, 2010. The fieldwork provides basic information critical to building an understanding of Alaska’s geology and is part of an integrated program of airborne geophysical surveys followed by geological mapping. During 2010, 130 rock samples were collected for geochemical trace-element analysis, and 20 rock samples were collected for whole rock (major- and minor-oxide) analysis. Petrogenetically important trace elements for additional rock samples will be analyzed and published with the final map and report for this area.

Tags: alaska, brooks creek, cambrian, cascaden ridge, cleary creek, cretaceous, devonian, eagle creek, elliot highway, ester creek, geochemistry, livengood, livengood creek, livengood quadrangle, major oxides, mccord creek, minor oxides, olive creek, ranney hollow, shorty creek, slate creek, state of, steel creek, tolovana hot springs, tolovana hot springs dome, tolovana river, trace metals, trans-alaska pipeline, west fork tolovana river, wilber creek, winter creek
Organization: State of Alaska
Tsunami inundation map for the village of Nikolski, Alaska

Potential tsunami hazard for the Umnak Island community of Nikolski is evaluated by numerically modeling the extent of inundation from tsunami waves generated by hypothetical earthquake sources. Worst-case hypothetical scenarios are defined by analyzing results of a sensitivity study of the tsunami dynamics related to various slip distributions along the Aleutian megathrust. The worst-case scenarios for Nikolski are thought to be thrust earthquakes in the Umnak Island region with their greatest slip at 10-30 km (6.2-19 mi) depth. We also consider Tohoku-type ruptures and an outer-rise rupture in the area of Umnak Island. The maximum predicted water depth on Main Street is about 15 m (49 ft), while the maximum current velocity in Mueller Cove could exceed 8 m/s (15 kt) and significant wave action could continue for at least 8 hours after the earthquake. Results presented here are intended to provide guidance to local emergency management agencies in tsunami inundation assessment, evacuation planning, and public education to mitigate future tsunami hazards.

Tags: active fault, aleutian islands, coastal, coastal and river hazards, earthquake, earthquake related hazards, emergency preparedness, engineering geology, fault displacement, faulting, flood, geologic hazards, hazards, inundation, land subsidence, modeling, nikolski, raster image, seismic gap, seismic hazards, tsunami
Organization: State of Alaska