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Filters Date Range Past year (0) Past month (0) Past week (0) Past day (0) Custom range... To   Search Extensions Shapefile (2) Types Downloadable (2) Map Service (2) OGC WFS Layer (2) Shapefile (2) Contacts Benjamin R. Bloss Geology, Geophysics, and Geochemistry Science Center Energy and Minerals U.S. Geological Survey David V Fitterman More... Tag Types Theme (2) Place (2) Harvest Set (2) USGS Scientific Topic Keyword (1) Tag Schemes None (2) USGS Thesaurus (2) Geographic Names Information System (GNIS) (1) SEG dictionary (1) USGS Geographic Names Information System (GNIS) (1) ISO 19115 Topic Category (2) View Results as: JSON ATOM CSV

Ground-based time-domain electromagnetic data and resistivity models for the Mississippi Alluvial Plain Project The Mississippi Alluvial Plain (MAP) Project contains several geologic units which act as important aquifers. We collected several sets of time-domain electromagnetic (TEM) data consisting of two higher-density surveys and six regional-scale transects. The higher density surveys were collected to compare and contrast to other geophysical data not included in this data release, such as airborne electromagnetic, magnetic resonance sounding, and towed time-domain electromagnetic surveys . The transects, which were collected over the span of three years, cross the MAP study area from east-to-west, with about 100 km line spacing, and cover an area of nearly 100,000 square-kilometer. Each transect spans a distance of... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Arkansas, Electromagnetic sounding, GPS measurement, Geology, Geophysics, and Geochemistry Science Center, Geophysics, All tags... Hydrogeology, Louisiana, MAP, Mississippi, Mississippi Alluvial Plain regional water availability, Mississippi alluvial plain, Missouri, TDEM, TEM, TEM, Tennessee, USGS Science Data Catalog (SDC), electromagnetic surveying, geophysics, geoscientificinformation, groundwater and surface-water interaction, hydrology, resistivity, time-domain electromagnetic sounding, time-domain electromagnetics, transient electromagnetic sounding, Fewer tags Transient Electromagnetic Sounding Data Collected in the San Luis Valley, Colorado near the Great Sand Dunes National Park and Preserve and the Alamosa National Wildlife Refuge (Field Seasons 2007, 2009, and 2011) Transient electromagnetic (TEM) soundings were made in the San Luis Valley, Colorado, to map the location of a blue clay unit as well as to investigate the presence of suspected faults. A total of 147 soundings were made near and in Great Sand Dunes National Park and Preserve, and an additional 6 soundings were made near Hansen Bluff on the eastern edge of the Alamosa National Wildlife Refuge. The blue clay is a significant hydrologic feature in the area that separates an unconfined surface aquifer from a deeper confined aquifer. Knowledge of its location is important to regional hydrological models. Previous analysis of well logs has shown that the blue clay has a resistivity of 10 ohm-meters or less, which is... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Alamosa County, Alamosa National Wildlife Refuge, Colorado, Great Sand Dunes National Park, Great Sand Dunes National Preserve, All tags... Saguache County, San Luis Valley, TEM, USGS Science Data Catalog (SDC), aquifer, clay, clay deposits, electromagnetic surveying, fault detection, faulting (geologic), geophysics, geoscientificInformation, groundwater, subsurface mapping, subsurface maps, transient electromagnetic sounding, Fewer tags