Snake River Plain Geothermal Play Fairway Analysis Project MT Data

Abstract

MT is measured in the field by using induction coils to measure the time-varying magnetic source for frequencies between 1000-0.001~Hz, and electric dipoles to measure the Earth's electrical response. Because the magnetic source field is polarized, orthogonal directions of the fields need to be measured to get a complete description of the fields. In all measurements collected for this project, induction coils and electric dipoles were aligned with geomagnetic north and east. MT data were collected at 22 stations with a ZEN 32-bit data logger developed by Zonge International, magnetic fields were measured with ANT-4 induction coils, and electric fields where measured with Ag-AgCl reference electrodes from Borin on 50~m dipoles. The data was collected on a repeating schedule of 10~min at 4096~samples/s and 7 hours and 50 minutes at 256 samples/s over a 20-24 hour period. To convert time series data into the frequency domain and get estimations of the impedance tensor, the processing code BIRRP was used (Chave & Thompson 2004). Simultaneous measurements were used as remote references to reduce noise and bias in the data.

Chave, A. D., & Thomson, D. J. 2004. Bounded inuence magnetotelluric response function estimation. Geophys. J. Int., 157, 988-1006.

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Additional Info

DOE Project Name: Geothermal Play Fairway Analysis of the Snake River Plain, Idaho
DOE Project Number: EE0006733
DOE Project Lead: Eric Hass
DOI: 10.15121/1493809
Last Updated: a year ago
May
2018
Data from May, 2018
Submitted Dec 10, 2018

Contact

United States Geological Survey


Status

Publicly accessible License 

Authors

Jared Peacock
United States Geological Survey
John Shervais
Utah State University
Jonathan Glen
United States Geological Survey

Keywords

geothermal, energy, Snake River Plain, PFA, play fairway analysis, Idaho, Camas, Prairie, magnetotellurics, MT, data, resistivity, conductivity, electrical, geophysics, geophysical, SRP

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