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Mount Adams Electromagnetic and Magnetic Data Hydrothermally altered rocks, particularly if water saturated, can weaken stratovolcanoes, thereby increasing the potential for catastrophic sector collapses that can lead to far-traveled, destructive debris flows, which are the largest volcanic hazards for Mount Adams and Mount Baker. Evaluating the hazards associated with such alteration is difficult because much of the alteration is obscured by ice and its depth extent is unknown. Intense hydrothermal alteration significantly reduces the resistivity and magnetization of volcanic rock and therefore hydrothermally altered rocks are identified with helicopter electromagnetic and magnetic measurements at Mount Baker and Mount Adams. High resolution magnetic and electromagnetic... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: CGGSC, Crustal Geophysics and Geochemistry Science Center, Fugro Airborne Surveys, Mount Adams, Washington, All tags... aeromagnetic surveying, electromagnetic surveying, geophysics, geospatial datasets, magnetic surveying, mountain, resistivity, volcanic hazards, Fewer tags Airborne electromagnetic and magnetic survey data, Stillwater Complex, Montana, May 2000 Note: There is an updated version of this data release, available here: https://doi.org/10.5066/P92R4OL2 A helicopter-borne electromagnetic/magnetic survey was flown over the Stillwater area, southwest Montana from May 5 to May 16, 2000. The survey was conducted over the Stillwater Igneous Complex, a Precambrian layered mafic-ultramafic intrusion which is characterized by igneous layering. Electromagnetic data were acquired using DIGHEM helicopter-borne electromagnetic system. Magnetic data were collected with optically pumped Cesium Vapor Geometrics G822 magnetometer. Sensor elevation above ground was measured with Honeywell/Sperry AA220 radar. The nominal elevation of the sensor was 60 meters. Survey coverage... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Geophysics, Montana, aeromagnetic surveying, electromagnetic surveying, geology, All tags... geophysics, geoscientificInformation, resistivity, Fewer tags Airborne Electromagnetic and Magnetic Survey, Yellowstone National Park, 2016 - Minimally Processed Data Airborne electromagnetic (AEM) and magnetic survey data were collected during November and December 2016 along 4,212 line-kilometers over Yellowstone National Park, Wyoming. The survey was conducted as part of a study of the subsurface geologic structure and geothermal and groundwater resources of Yellowstone National Park. The survey was designed to image the subsurface plumbing of Yellowstone's myriad thermal features by constraining the geometry of the major hydrostratigraphic contacts and mapping regional-scale geologic structures. Data were acquired by SkyTEM ApS with the SkyTEM 312M time-domain helicopter-borne electromagnetic system together with a Geometrics G822A cesium vapor magnetometer. The survey was... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: GGGSC, Geology, Geophysics, and Geochemistry Science Center, Geophysics, Grand Canyon of the Yellowstone River, Hot Spring Basin Group, All tags... Lower Falls of the Yellowstone River, Lower Geyser Basin, MRP, Mammoth Hot Springs, Midway Geyser Basin, Mineral Resources, Mineral Resources Program, Mud Volcano, Norris Geyser Basin, Old Faithful, Park County, Pelican Valley, State of Wyoming, Teton County, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), United States of America, Upper Falls of the Yellowstone River, Upper Geyser Basin, Volcanology, Wyoming, Yellowstone Lake, Yellowstone National Park, Yellowstone National Park, Yellowstone River, aeromagnetic surveying, electromagnetic surveying, environment, geologic structure, geophysics, geoscientificInformation, geospatial datasets, geothermic, groundwater, hydrogeology, resistivity, Fewer tags Airborne electromagnetic and magnetic survey data, Iliamna Volcano, Alaska, June 2012 Airborne electromagnetic (AEM) and magnetic survey data were collected during June 2012 along 556 line-kilometers over Iliamna Volcano, Alaska. These data were collected in support of alteration and volcano flank instability mapping as part of the U.S. Geological Survey (USGS) Volcano Hazards Program. Data were acquired by SkyTEM Survey ApS SkyTEM304 system with the Soloy Helicopters Eurocopter Astar 350 B3 and Bell 407 dual-moment, time-domain helicopter-borne electromagnetic system together with a Geometrics G822A cesium vapor magnetometer with Kroum KMAG4 counter. The survey was flown at a nominal flight height of 30 meters (m) above terrain along block-style lines with a nominal spacing of 250 m. The survey... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Shapefile; Tags: Alaska, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Iliamna Volcano, Kenai Peninsula, All tags... MRP, Mineral Resources Program, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), USGS Volcano Hazards Program, aeromagnetic surveying, electromagnetic surveying, geophysics, geoscientificInformation, geospatial datasets, hazards, landslides, resistivity, volcanology, Fewer tags Mount Baker Electromagnetic and Magnetic Data Hydrothermally altered rocks, particularly if water saturated, can weaken stratovolcanoes, thereby increasing the potential for catastrophic sector collapses that can lead to far-traveled, destructive debris flows, which are the largest volcanic hazards for Mount Adams and Mount Baker. Evaluating the hazards associated with such alteration is difficult because much of the alteration is obscured by ice and its depth extent is unknown. Intense hydrothermal alteration significantly reduces the resistivity and magnetization of volcanic rock and therefore hydrothermally altered rocks are identified with helicopter electromagnetic and magnetic measurements at Mount Baker and Mount Adams. High resolution magnetic and electromagnetic... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: CGGSC, Crustal Geophysics and Geochemistry Science Center, Fugro Airborne Surveys, Mount Baker, Washington, All tags... aeromagnetic surveying, electromagnetic surveying, geophysics, geospatial datasets, magnetic surveying, mountains, resistivity, Fewer tags Bouguer gravity and magnetic susceptibility measurements at Iliamna Volcano, Alaska 2019 Gravity data were collected in August of 2019 at 21 sites on and around Iliamna Volcano and Anchorage, Alaska. Measurements were taken with a Lacoste & Romberg G-161 meter and reduced to obtain the complete Bouguer anomaly. A total of 39 magnetic susceptibility measurements were taken at 13 locations using a ZH Instruments SM30 susceptibility meter. This data release includes susceptibility measurements, processed gravity data, shapefiles with field locations, and site photos. Categories: Data; Types: Downloadable, GeoTIFF, Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service, Raster; Tags: Alaska, Cook Inlet, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Geophysics, All tags... Iliamna, Iliamna Volcano, Kenai Peninsula, Lake Clark National Preserve, MRP, Mineral Resources Program, U.S. Geological Survey, USGS, USGS Science Data Catalog (SDC), USGS Volcano Hazards Program, Volcanology, bouguer anomaly, free-air anomaly, geophysics, geoscientificInformation, gravimeter measurement, gravitational field (earth), isostatic anomaly, magnetic susceptibility, volcanology, Fewer tags Airborne electromagnetic and magnetic survey data, Stillwater Complex, Montana, May 2000 (ver. 2.0, June 2020) A helicopter-borne electromagnetic/magnetic survey was flown over the Stillwater area, southwest Montana from May 5 to May 16, 2000. The survey was conducted over the Stillwater Igneous Complex, a Precambrian layered mafic-ultramafic intrusion which is characterized by igneous layering. Electromagnetic data were acquired using DIGHEM helicopter-borne electromagnetic system. Magnetic data were collected with optically pumped Cesium Vapor Geometrics G822 magnetometer. Sensor elevation above ground was measured with Honeywell/Sperry AA220 radar. The nominal elevation of the sensor was 60 meters. Survey coverage comprises 1,914 line kilometers, including tie lines. Flight lines were flown in an azimuthal direction of... Categories: Data, Data Release - Revised; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Montana, USGS Science Data Catalog (SDC), aeromagnetic surveying, electromagnetic surveying, geology, All tags... geophysics, geoscientificInformation, resistivity, Fewer tags Mount Baker and Mount Adams Airborne Magnetic and Electromagnetic Survey Data, August 2002, Washington, USA Hydrothermally altered rocks, particularly if water saturated, can weaken stratovolcanoes, thereby increasing the potential for catastrophic sector collapses that can lead to far-traveled, destructive debris flows, which are the largest volcanic hazards for Mount Adams and Mount Baker. Evaluating the hazards associated with such alteration is difficult because much of the alteration is obscured by ice and its depth extent is unknown. Intense hydrothermal alteration significantly reduces the resistivity and magnetization of volcanic rock and therefore hydrothermally altered rocks are identified with helicopter electromagnetic and magnetic measurements at Mount Baker and Mount Adams. High resolution magnetic and electromagnetic... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: CGGSC, Crustal Geophysics and Geochemistry Science Center, Fugro Airborne Surveys, Geophysics, Mt Baker, All tags... Mt. Adams, USGS Science Data Catalog (SDC), Volcanology, Washington, aeromagnetic surveying, electromagnetic surveying, geophysics, geospatial datasets, magnetic surveying, mountain, resistivity, Fewer tags