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Transient Electromagnetic Surveys Collected for Delineation of Saline Groundwater in the Genesee Valley, New York, October-November 2016

Dates

Publication Date
Start Date
2016-10-26
End Date
2016-11-15

Citation

Johnson, C.D., White, E.A., Williams, J.H., and Kappel, W.M., 2017, Transient Electromagnetic Surveys Collected for Delineation of Saline Groundwater in the Genesee Valley, New York, October-November 2016: U.S. Geological Survey data release, https://doi.org/10.5066/F79C6VXX.

Summary

In late October and early November 2016, transient electromagnetic (TEM) data were acquired at two locations in Livingston County, in western New York, in order to characterize the subsurface resistivity structure in support of a U.S. Geological Survey groundwater investigation. The TEM data were collected as part of a pilot project to evaluate geophysical methods to characterize the valley-fill sediments, underlying bedrock, and salinity of the subsurface. TEM data were collected using an ABEM WalkTEM unit (acquisition software V 1.1.0) using a 100 by 100 meter square transmitter loop (Tx), a center-loop receiver (Rx) that is 0.5 by 0.5 square meters in size (with an effective area of 35 m^2), and dual currents of about 2 and 11 amperes [...]

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Attached Files

Click on title to download individual files attached to this item.

README.txt
“Readme file for USGS Data Release (index)”
2.27 KB
TEM_dictionary.zip
“Data dictionary for TEM terms in csv, xlsx, and pdf formats”
114.54 KB
TEM_output.zip
“For each TEM survey site, output data are provided in space-delimited ASCII form”
6.76 KB
TEM_raw_ASCII.zip
“TEM survey site raw data are provided in space-delimited and csv files”
6.61 KB
TEM_raw_BIN.zip
“TEM survey site raw data files (ending in gdb) in original binary format”
1.74 MB
Fig.1.jpg
“Location map of TEM surveys”
thumbnail 391.92 KB
Transient Electromagnetic Surveys Collected for Delineation of Saline Groundwater in the Genesee Valley NY Oct-Nov 2016.xml
Original FGDC Metadata

View
15.87 KB

Purpose

Surface geophysical methods can provide information for the characterization of the subsurface structure of the earth for aquifer investigations. Transient electromagnetic induction (TEM) surveys (also called time domain electromagnetic (TDEM) surveys) provide resistivity soundings of the subsurface, which can be related to lithology and hydrogeology. In the TEM method, electrical current is cycled through a wire in a transmitter loop (Tx), which in turn produces a static magnetic field. When the current is abruptly terminated, an instantaneous current is induced in the earth, and it moves downward and outward as the induced current decays with time. The decay is controlled by the resistivity of the earth. A receiver (Rx) at the center of the Tx loop measures the secondary magnetic field as a function of time (dB/dt). Decaying voltage measurements at the receiver are converted to apparent resistivity, which can be inverted to recover the depth-dependent resistivity structure of the earth.
Location map of TEM surveys
Location map of TEM surveys

Map

Communities

  • USGS New York Water Science Center

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Provenance

Additional Information

Identifiers

Type Scheme Key
DOI https://www.sciencebase.gov/vocab/category/item/identifier doi:10.5066/F79C6VXX

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