Geophysical logs on file with the U.S. Geological Survey were inventoried as part of the Memphis-Shelby County Seismic Hazards Mapping project. The geophysical logs can be used to provide subsurface geological and geotechnical data. The results of the inventory are presented below and are provided for the internal use of the Seismic Hazards Mapping team.
More than 900 geophysical logs are available for more than 800 wells or boreholes in Shelby County. About 90% of the geophysical logs are natural gamma or electric logs. Other logs available include caliper, temperature, sonic, neutron, gamma-gamma, and induction. Data tables presented for this inventory include a site-identification number, county number, latitude, longitude, land-surface elevation, hole depth, well depth, log type, and top and bottom of the log interval. The county number consists of SH for Shelby County, a letter code for the 7-1/2-minute quadrangle, and a sequential number. The letter codes for the quadrangle are shown on the map below and listed on the summary table. Land-surface elevations for most of the wells are based on plotting well locations and determining elevations from the map. Latitude and longitude are presented in degrees, minutes, and seconds.
Data tables for the individual quadrangles can be accessed by clicking on that quadrangle in the map below. Data tables, in HTML or Excel format, are also available for all of Shelby County; connecting to or downloading these tables may be slow due to their large size.
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| USGS | USGS Branch of Geophysical Applications and Support |
Center for Earthquake Research and Information |
Tennessee Division of Geology |
Page design and layout by Kim Waltenbaugh