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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) Shapefile (2) Contacts Stephanie R James U.S. Geological Survey Neal J Pastick Stephanie R James U.S. Geological Survey - ScienceBase More... Categories Data (2) Tag Types Theme (2) Place (2) Tag Schemes None (2) USGS Thesaurus (2) Geographic Names Information System (GNIS) (2) ISO 19115 Topic Category (2) View Results as: JSON ATOM CSV

Alaska permafrost characterization: Electrical Resistivity Tomography Data & Models from 2019 Electrical resistivity tomography (ERT) measurements were collected by the U.S. Geological Survey (USGS) at two sites in Interior Alaska in September 2019 for the purposes of imaging permafrost structure and quantifying variations in subsurface moisture content in relation to thaw features. First, ERT data were collected at Big Trail Lake, a thermokarst lake outside of Fairbanks, Alaska, to quantify permafrost characteristics beneath the lake and across its shorelines. Three 222 m ERT survey lines were collected perpendicular to the North, East, and South shorelines, and two 110 m lines were collected parallel to the southeast and northeast shorelines. Models of electrical resistivity produced from these data revealed... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Active layer thickness, Alaska, Big Trail Lake, Bonanza Creek Experimental Forest, Disturbance, All tags... Electrical Resistivity Tomography, Fairbanks North Star, Fire, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Hydrologic processes, Land Change Science Program, Permafrost, U.S. Geological Survey, USGS, electrical resistivity, environment, fires, geoscientificInformation, hydrologic processes, permafrost, soil moisture, Fewer tags Alaska permafrost characterization: Borehole Nuclear Magnetic Resonance Data & Models from 2019-2020 Borehole nuclear magnetic resonance (NMR) data were collected by the U.S. Geological Survey (USGS) at Big Trail Lake, a thermokarst lake outside of Fairbanks, Alaska, to quantify unfrozen water content and soil properties at select sites in and around the lake edge. In September 2019, NMR data were collected within two 2.3 m deep boreholes adjacent to the East and North perpendicular electrical resistivity survey lines. Manual permafrost-probe measurements of thaw depths were also collected. These two boreholes were logged a second time in late March 2020. Additional one-time NMR measurements of liquid water content were collected in September 2019 within the lakebed sediments (0-25 cm depth) in approximately 2.5... Categories: Data; Types: Downloadable, Map Service, OGC WFS Layer, OGC WMS Layer, Shapefile; Tags: Active layer thickness, Alaska, Big Trail Lake, Borehole nuclear magnetic resonance, Disturbance, All tags... Fairbanks North Star, GGGSC, Geology, Geophysics, and Geochemistry Science Center, Hydrologic processes, Land Change Science Program, Permafrost, U.S. Geological Survey, USGS, environment, fires, geoscientificInformation, hydrologic processes, permafrost, soil moisture, Fewer tags