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Geophysical Site Characterization of Bay Area Seismic Monitoring Stations: Vs-depth Profiling, NEHRP Site Classifications, and Linear Shallow Seismic Amplification Functions New active-source shallow seismic (shear-wave and acoustic-wave) measurements were obtained at 18 prioritized seismic monitoring station locations in the north San Francisco Bay area to measure site-specific ground motion amplification effects, soil depth, depth to bedrock (Z1.0 Vs=1 km/s), calculate site specific velocity-depth profiles and Vs30, and develop NEHRP site classifications for each location. This study was led by Principal Investigators Jamey Turner, Cooper Brossy, and Daniel O’Connell and field data were acquired by Glendon Adams and Lincoln Steele. Seismic monitoring sites that recorded high PGA values during the M6.0 Napa earthquake, proximal to higher population densities, and sites recommended... Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: California, EHP, Earthquake Hazards Program, GHSC, Geologic Hazards Science Center, All tags... NEHRP, Napa, National Earthquake Hazards Reduction Program, PGA, PGV, San Francisco Bay, USGS, United States, earth science, earthquake hazard, geophysical survey, geophysics, peak ground acceleration, peak ground velocity, seismic hazards, seismic monitoring, seismic velocity, seismology, shear wave velocity, tectonophysics, Fewer tags Airborne magnetic survey, northwestern Minnesota, 2021 This data release provides digital flight line data for a high-resolution airborne magnetic survey over parts of northwestern Minnesota near the town of Mentor. The airborne survey was funded by the Earth Mapping Resources Initiative and was designed to meet complementary needs related to geologic mapping and characterization of mineral resource potential. A total of 40,139-line km of magnetic data were acquired over an irregular-shaped area of 9140 km2. Data were collected from a fixed-wing aircraft flown at mean terrain clearance of 120 meters (m) above topography along N-S flight lines spaced at 250 m intervals. Tie lines were flown in an E-W direction every 2500 m. Data were collected by EDCON-PRJ and NV5 Geospatial,... Categories: Data; Types: Downloadable, GeoTIFF, Map Service, Raster; Tags: Becker County, Clay County, Clearwater River, Earth Mapping Resources Initiative, EarthMRI, All tags... GGGSC, Geology, Geophysics, and Geochemistry Science Center, MRP, Marsh River, Marshall County, Mentor Complex, Mineral Resources Program, Minnesota, Norman County, Pennington County, Polk County, Red Lake County, Red Lake River, Silver River, Thief River, Thief River Falls, U.S. Geological Survey, USA, USGS, United States, United States of America, Wild Rice River, aeromagnetic surveying, airborne geophysical survey, economy, geophysics, geoscientificInformation, geospatial datasets, horizontal magnetic gradiometry, magnetic field (earth), northwestern Minnesota, vertical magnetic gradient, Fewer tags Airborne magnetic and radiometric survey of the Wet Mountains and surrounding region, Custer and Fremont Counties, south-central Colorado, 2021 This data release provides digital flight-line and gridded data for a high-resolution airborne magnetic and radiometric survey over the region surrounding the Wet Mountains of southern Colorado, including parts of Custer and Fremont Counties. Data for this survey were collected by Sander Geophysics Limited International (SGL) under contract with the USGS. The survey was flown in June and July of 2021 using a helicopter equipped with a magnetometer mounted in a stinger extending from the nose of the aircraft and a gamma-ray spectrometer stowed onboard. The helicopter pilots followed pre-planned flight paths in a grid-like pattern, with east-west lines spaced 150 meters apart and north-south lines spaced 1,000 meters... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: "Mineral Resources"], AASG, Antelope Creek, Arkansas River, Association of State Geologists, All tags... Canon City, Colorado, Custer County, Earth Mapping Resources Initiative, EarthMRI, Economic Geology, Fremont County, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Geophysics, Grape Creek, MRP, Mineral Resources, Mineral Resources Program, National Cooperative Geologic Mapping Program, North Hardscrabble Creek, Oak Creek, Rosita Hills, Royal Gorge, Sedimentology, Sliver Cliff, Structural Geology, Tallahassee Creek, Texas Creek, U.S. Geological Survey, USA, USGS, USGS Science Data Catalog (SDC), United States, United States of America, Westcliffe, Wet Mountain Valley, Wet Mountains, ["Geophysics", aeromagnetic surveying, aeroradiometric surveying, airborne geophysical survey, economy, geophysics, geoscientificInformation, geospatial datasets, magnetic field (earth), potassium, south-central Colorado, thorium, uranium, Fewer tags [Geophysical Data] Depth to Moho GeoTIFF grids for the United States, Canada, and Australia The Mohorovicic discontinuity or 'Moho' maps the boundary between the earth's crust and mantle and is defined by an abrupt change in seismic velocity due to changes in the density of rocks between the crust and mantle. GeoTIFF grids that map depth to Moho (crustal thickness) for the United States and Canada, and for Australia are provided in this report and were used as evidential layers in developing prospectivity models for basin-hosted Pb-Zn mineralization (Lawley and others, 2022). A composite grid of Moho depths across the United States and Canada was created using data from Shen and Ritzwoller (2016) for the conterminous United States, from Zhang and others (2019) for Alaska, and from Schetselaar and Snyder... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Australia, CMMI, Canada, Critical Minerals Mapping Initiative, Exploring for the Future Program, All tags... GA, GGGSC, GSC, Geological Survey of Canada, Geology, Geophysics, and Geochemistry Science Center, Geoscience Australia, MRP, Mineral Resources Program, Moho, Mohorovičić discontinuity, TGI, Targeted Geoscience Initiative, U.S. Geological Survey, USGS, United States, critical minerals, crustal structure, crustal thickness, depth to Moho, geophysics, geoscientificInformation, lead, magnetic field (earth), mantle, mantle (earth), maps and atlases, metallic mineral resources, mineral resources, zinc, Fewer tags [Geophysical Data] Gravity and related derivative GeoTIFF grids and data for Australia Several evidential layers calculated from the national-scale gravity anomaly map of Australia (Geophysical Acquisition and Processing Section, 2020) are provided here. This directory includes GeoTIFF grids of Bouguer gravity, the horizontal gradient magnitude of the Bouguer gravity, the Bouguer gravity upward continued 30 km, and the horizontal gradient magnitude of the upward continued gravity, The directory also includes shapefiles of locations that trace the maxima of the horizontal gradient magnitude of the gravity and of the maxima of the horizontal gradient magnitude of the upward continued gravity. Otherwise known as “worms”, the points tracking the maxima mark the edges of shallow density sources (in the... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Australia, Bouguer gravity, CMMI, Critical Minerals Mapping Initiative, Exploring for the Future Program, All tags... GA, GGGSC, GSC, Geological Survey of Canada, Geology, Geophysics, and Geochemistry Science Center, Geoscience Australia, MRP, Mineral Resources Program, TGI, Targeted Geoscience Initiative, U.S. Geological Survey, USGS, critical minerals, geophysics, geoscientificInformation, gravity, gravity anomaly, ground gravity, horizontal gradient magnitude, horizontal gradient magnitude maxima, lead, maps and atlases, metallic mineral resources, mineral resources, zinc, Fewer tags Beach topography and nearshore bathymetry of northern Monterey Bay, California This data release presents beach topography and nearshore bathymetry data from repeated surveys in northern Monterey Bay, California to document changes in shoreline position and coastal morphology as they relate to episodic (storms), seasonal, and interannual and longer (e.g. El Niño) processes. The ongoing monitoring program was initiated in October 2014 with semi-annual surveys performed in late summer (September or October) and Spring (March). Nearshore bathymetry and topography data were collected along a series of shore-perpendicular transects spaced primarily at 50-250 m intervals between Santa Cruz and Moss Landing, California (fig. 1). The transects were located along sandy stretches of the coastline... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Bathymetry and Elevation, CMGP, Coastal and Marine Geology Program, Echo Sounders, GPS (Global Positioning System), All tags... GPS measurement, Geophysics, Global Positioning System (GPS) observations, LIDAR, Monterey Bay, Monterey County, PCMSC, Pacific Coastal and Marine Science Center, Pacific Ocean, Santa Cruz County, U.S. Geological Survey, USGS, Water Depth, bathymetry, bathymetry measurement, coastal sediment budget, digital elevation models, elevation, single-beam echo sounder, topographic mapping, topography, Fewer tags Chirp, multichannel minisparker, and boomer seismic-reflection data from USGS field activity G-01-13-GA collected in Port Valdez, Alaska, in September 2013 Multichannel minisparker and boomer seismic-reflection and chirp sub bottom data were collected by the U.S. Geological Survey in September of 2013 in Port Valdez, Alaska. Data were collected aboard the USGS R/V Alaskan Gyre during field activity G-01-13-GA. Sub-bottom acoustic penetration spans several hundreds of meters and is variable by location. High-resolution multichannel seismic-reflection data were acquired to support the U.S. Geological Survey Alaska coastal and marine hazards project to explore the sedimentary structure of tsunamigenic landslide deposits around an IODP drill site in Port Valdez. These data and information are intended for science researchers, students from elementary through college, policy... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Geophysics, Seismology, Structural Geology Chirp and minisparker seismic-reflection data of field activity L-1-06-SF collected offshore Bolinas to San Francisco, California from 2006-09-25 to 2006-10-03 High-resolution single-channel Chirp and minisparker seismic-reflection data were collected by the U.S. Geological Survey in September and October 2006, offshore Bolinas to San Francisco, California. Data were collected aboard the R/V Lakota, during field activity L-1-06-SF. Chirp data were collected using an EdgeTech 512 chirp subbottom system and were recorded with a Triton SB-Logger. Minisparker data were collected using a SIG 2-mille minisparker sound source combined with a single-channel streamer, and both were recorded with a Triton SB-Logger. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Bathymetry and Elevation, Bolinas, CMHRP, Coastal and Marine Hazards and Resources Program, Elevation, All tags... Geophysics, Golden Gate, Marine Geology, North Pacific Ocean, Ocean Beach, Oceans, PCMSC, Pacific Coastal and Marine Science Center, Pacific Ocean, San Francisco, State of California, U.S. Geological Survey, USGS, geoscientificinformation, geospatial datasets, marine geophysics, seismic reflection profiling, sub-bottom profiling, Fewer tags Gravity station data, middle Carson River basin, Nevada (from U.S. Geological Survey Scientific Investigations Report 2011-5055, figure 7) This dataset consists of point gravity station data for 95 stations in the middle Carson River basin as published on figure 7 in the U.S. Geological Survey Scientific Investigations Report 2011-5055. The points have values of the complete Bouguer anomaly and observed gravity. In addition, 641 selected gravity stations from the U.S. Geological Survey Data Series 42 titled "Gravity data of Nevada" used in this study are included for reference and users are advised to reference that publication for information on those data. Reference cited Ponce, D.A., 1997, Gravity data of Nevada: U.S. Geological Survey Data Series 42, 27 p., https://doi.org/10.3133/ds42. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Basin 101, Basin 102, Basin 103, Basin 104, Basin 105, All tags... Carson Desert, Carson River, Carson River Region, Carson Valley, Churchill Valley, Dayton Valley, Eagle Valley, Hydrographic Region 8, Middle Carson River Basin, Nevada, bouguer anomaly, geophysics, geoscientificInformation, gravitational field (earth), groundwater, inlandWaters, permeability, Fewer tags Estimated thickness of unconsolidated basin-fill sediments, middle Carson River basin, Nevada (from U.S. Geological Survey Scientific Investigations Report 2011-5055, figure 9) This dataset consists of polyline estimates of the thickness of basin-fill sediments at 200-foot contour intervals for the middle Carson River basin as published on figure 9 in the U.S. Geological Survey Scientific Investigations Report 2011-5055. The estimates were made using gravity data collected at 736 stations in the middle Carson River basin reduced to a residual complete Bouguer anomaly. A relation between residual gravity and depth to bedrock was developed from descriptions on drillers logs of 25 wells that encountered bedrock. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Basin 101, Basin 102, Basin 103, Carson Desert, Carson River, All tags... Carson River Region, Churchill Valley, Dayton Valley, Hydrographic Region 8, Middle Carson River basin, Nevada, bedrock geologic units, bouguer anomaly, geophysics, geoscientificInformation, gravitational field (earth), groundwater, inlandWaters, permeability, stratigraphic thickness, Fewer tags Hydrogeology of the Tully Valley Mudboil Area, Southern Onondaga County, New York Problem The Tully Valley, located in southern Onondaga County has been the source of sediment and brackish water discharge to Onondaga Creek, a tributary to the Seneca and Oswego Rivers and eventually Lake Ontario. Information on the origin of the Tully Valley mudboils, their persistence, and the possible extent of their migration within the Tully Valley is needed to mitigate or remediate (1)the discharge of turbid water and fine-grained sediment from the mudboils, (2) land-surface subsidence caused by the removal of sediment from below the land surface, and (3) degradation of Onondaga Creek by turbidity, fine-sediment deposition, and chloride loading. Objectives To define the glacial stratigraphy and hydraulic-head... Categories: Data, Project; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Cooperative Research Units, Cooperative Water Program, GW or SW, GW or SW, GW or SW, All tags... Geophysics, Geophysics, Groundwater Monitoring, Groundwater Monitoring, Groundwater Monitoring, Groundwater and Streamflow Information, Groundwater and Streamflow Information, Hydrogeologic Characterization, Hydrogeologic Characterization, Hydrogeologic Characterization, Landslide Hazards, New York, Sediment, Sediment, Sediment, Tully Valley, Southern Onondaga County, USGS New York Water Science Center, WSC, Fewer tags Airborne radiometric flight line data, western Arkansas, 2022 Airborne radiometric data are provided here as part of the data release "Airborne magnetic and radiometric survey, western Arkansas, 2022." This website includes the processed radiometric data, with and without spectra, provided in ASCII .csv files and geoTIFF images showing the total count (K, U, Th), percent potassium (%K), equivalent uranium (eU), and equivalent thorium (eTh). Categories: Data; Types: Downloadable, GeoTIFF, Map Service, Raster; Tags: AASG, Arkansas, Association of State Geologists, Dardanelle, Dardanelle Lake, All tags... Earth MRI, Earth Mapping Resources Initiative, GGGSC, Garland, Geology, Geophysics, and Geochemistry Science Center, Johnson, Logan, MRP, Mineral Resources Program, NCGMP, National Cooperative Geologic Mapping Program, Ouachita National Forest, Petit Jean, Pope, Saline, Scott, U.S. Geological Survey, USA, USGS, United States, United States of America, Yell, aeromagnetic surveying, aeroradiometric surveying, airborne geophysical survey, critical minerals, economic geology, economy, geophysics, geoscientificInformation, geospatial datasets, potassium, structural geology, thorium, uranium, west-central Arkansas, western Arkansas, western Arkansas, Fewer tags Data for Frictional Properties and 3-D Stress Analysis of the Southern Alpine Fault, New Zealand (2013) New Zealand’s Alpine Fault (AF) ruptures quasi-periodically in large-magnitude earthquakes. Paleoseismological evidence suggests that about half of all recognized AF earthquakes terminated at the boundary between the Central and South Westland sections of the fault. There, fault geometry and the polarity of uplift change. The South Westland AF exhibits oblique-normal fault motion on a structure oriented 055/82SE that, for at least 35 km along strike, contains saponite-rich principal slip zone gouges. New hydrothermal friction experiments reveal that the saponite fault gouge is frictionally weak, exhibiting friction coefficients between =0.12 and =0.16 for a range of temperatures (T=25–210 C) and effective normal... Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Geophysics, New Zealand, Structural Geology, USGS Science Data Catalog (SDC), earthquake hazard, All tags... frictional strength, stress state, Fewer tags Airborne Geophysical Surveys over the Eastern Adirondacks, New York State Airborne geophysical surveys were conducted in the eastern Adirondacks from Dec. 7, 2015 - Dec. 21, 2015, by Goldak Airborne Surveys. The area was flown along a draped surface with a nominal survey height above ground of 200 meters. The flight line spacing was 250 meters for traverse lines and 2500 meters for control lines. Here we present downloadable magnetic and radiometric (gamma spectrometry) data from those surveys as image (Geotiff) and flight line data (csv format). Background The Eastern Adirondacks region was known for iron mining in the 1800's and 1900's but it also contains deposits of rare earth minerals. Rare earth minerals are used in advanced technology such as in cell phones, rechargeable batteries... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Adirondack Mountains, CGGSC, Crustal Geophysics and Geochemistry Science Center, Essex County, Geophysics, All tags... MRP, Mineral Resources, Mineral Resources Program, New York, Remote Sensing, USGS Science Data Catalog (SDC), United States, aeromagnetic maps, aeromagnetic surveying, aeroradiometric surveying, airborne magnetics, economy, geologic mapping, geologic maps, geoscientificInformation, magnetic anomaly maps, magnetic field (earth), magnetics, mineral resources, mineral resources, subsurface imaging, subsurface maps, Fewer tags Principal facts of gravity data in the southern San Luis Basin, northern New Mexico Gravity data were collected from 2006 through 2015 to assist in mapping subsurface geology in the southern San Luis Basin, northern New Mexico. This data release provides principal facts for 566 new gravity stations that were acquired to fill in gaps in the existing public gravity data coverage. Categories: Data; Types: Citation, Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Geophysics, Questa, Rio Arriba County, Taos, Taos County, All tags... Tres Piedras, USGS Science Data Catalog (SDC), bouguer anomaly, free-air anomaly, geoscientificInformation, gravimeter measurement, gravitational field (earth), isostatic anomaly, Fewer tags Airborne magnetic and radiometric survey, southeast Missouri and western Illinois, 2018-2019 This publication provides digital flight line data for a high-resolution horizontal magnetic gradient and radiometric survey over an area of southeast Missouri and western Illinois. The survey represents the first airborne geophysical survey conducted as part of the U.S. Geological Survey (USGS) Earth Mapping Resource Initiative (Earth MRI) effort (Day, 2019). Earth MRI is a cooperative effort between the USGS, the Association of American State Geologists, and other Federal, State, and private sector organizations to improve our knowledge of the geologic framework of the United States. Data for this survey were collected by Terraquest, Ltd. under contract with the USGS using a fixed wing aircraft with magnetometers... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Earth Mapping Resources Initiative, EarthMRI, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Illinois, All tags... Ironton, MRP, Mineral Resources Program, Missouri, USGS Science Data Catalog (SDC), aeromagnetic surveying, aeroradiometric surveying, airborne geophysical survey, economy, geophysics, geoscientificInformation, geospatial datasets, horizontal magnetic gradiometry, none, potassium, thorium, uranium, Fewer tags Audiomagnetotelluric sounding data, stations 1-9, Taos Plateau Volcanic Field, New Mexico, 2009 This dataset includes the audio-magnetotelluric (AMT) sounding data collected in 2009 in and near the San Luis Basin, New Mexico. The U.S. Geological Survey conducted a series of multidisciplinary studies, including AMT surveys, in the San Luis Basin to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits comprising the principal groundwater aquifers of the Rio Grande rift. The shallow unconfined and the deeper confined Santa Fe Group aquifers in the San Luis Basin are the main sources of municipal water for the region. The population of the San Luis Basin region is growing rapidly and water shortfalls could have serious consequences. Future growth and land management... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: AMT, Cerro, Cerro De La Olla, GGGSC, GPS measurement, All tags... Geology, Geophysics, and Geochemistry Science Center, Geophysics, Guadalupe Mountain, Hydrogeology, MRP, MT, Mineral Resources Program, New Mexico, No Agua Peaks, Questa, Rio Grande, Rio Grande Basin, Rio Grande rift, San Luis Basin, Sangre de Cristo Mountains, Santa Fe Group, Taos County, Taos Plateau Volcanic Field, USGS Science Data Catalog (SDC), Water Resources, apparent resistivity, aquifer, audiomagnetotelluric, deformation (geologic), electromagnetic surveying, geologic framework, geophysics, geoscientificInformation, groundwater, hydrogeology, impedance, impedance phase, impedance strike, magnetic field (earth), magnetic surveying, magnetotelluric surveying, regional fluid flow, sedimentary deposits, sedimentation, sounding, tipper, Fewer tags Compilation of Geologic and Seismic Velocity Characteristics at Advanced National Seismic System Strong Motion Accelerometer Sites Near-surface site characteristics are critical for accurately modeling ground motion, which in turn influences seismic hazard analysis and design of critical infrastructure. Currently, there are many strong motion accelerometers within the Advanced National Seismic System (ANSS) that are missing this information. We use a Geographic Information Systems (GIS) based framework to intersect the site coordinates of approximately 5,500 ANSS accelerometers located throughout the United States and its territories with geology and velocity information. We consider: (1) surficial geology from digitized geologic maps (Horton, 2017; Wilson et al., 2015; Sherrod et al., 2007; Bawiec, 1999; Saucedo, 2005; Bedrossian et al., 2012;... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: ANSS, Alabama, American Samoa, Arizona, Arkansas, All tags... California, Colorado, Connecticut, Delaware, Florida, Geography, Geophysics, Georgia, Guam, Idaho, Illinois, Indiana, Information Sciences, Iowa, Kansas, Kentucky, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nebraska, Nevada, New Hampshire, New Jersey, New Mexico, New York, North Carolina, North Dakota, Ohio, Oklahoma, Oregon, Pennsylvania, Puerto Rico, Remote Sensing, Rhode Island, Seismic site characteristics, Seismology, Soil Sciences, South Carolina, South Dakota, Strong Motion, Structural Geology, Tennesee, Texas, USGS Science Data Catalog (SDC), United States, Utah, Vermont, Virginia, Vs30, Washington, West Virginia, Wisconsin, Wyoming, earthquake seismology, seismic stations, vs30 measurements, vs30 proxy, Fewer tags Crustal architecture of the transtensional Warm Springs Valley fault zone, northern Walker Lane This data release contains field data for two P-wave seismic reflection profiles acquired across the Warm Springs Valley fault zone, part of the Northern Walker Lane, NV. The dataset consists of high-resolution seismic reflection field records in .segy format, shot coordinates in .csv format, and observers’ logs in .pdf format. The high-resolution seismic profiles are approximately 4 km long. The northern profile (Warm Springs Line 1) is oblique to a prominent fault bounded ridge. The southern profile (Warm Springs Line 2) crosses the northern end of Warm Springs Valley and is nearly co-located with COCORP profile NV-08. To obtain the seismic profiles, we used a 230 kg accelerated weight drop source and a nominal... Categories: Data; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service; Tags: Fault, Geophysics, Hazards, Nevada, Seismic, All tags... USGS Science Data Catalog (SDC), Walker Lane, Warm Springs Valley, Fewer tags Magnetotelluric data from northern Harrat Rahat, Saudi Arabia, 2016 This dataset consists of 122 magnetotelluric (MT) soundings collected in 2016 in the northern Harrat Rahat, located near the holy city of Al-Madinah Al-Munawarah in Saudi Arabia. These data were collected as part of a joint project between the U.S. Geological Survey and the Saudi Geological Survey examining the volcanic hazard associated with the harrat. Imaging the 3-D electrical resistivity structure of the crust and upper mantle beneath the harrat will help in understanding the magmatic system at depth. Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Earth magnetic field, Electromagnetic surveying, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Geophysics, All tags... Geophysics, GeoscientificInformation, MT, Saudi Arabia, USGS Science Data Catalog (SDC), VHP, Volcano Hazards Program, Volcanology, apparent resistivity, conductivity, impedance, magnetotellurics, phase, time series, tipper, Fewer tags 1 2 3 4 5 ... 20 »