Snake River Plain Geothermal Play Fairway Analysis Project MT Data camas_plots.zip

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. Images of the MT responses (basically plotting what is in the EDI file)

Data and Resources

Metadata Source

Additional Info

Field Value
Citation Date 2018-05-06T00:00:00-06:00

Harvest Information

Original ID f0000002-58cc-4372-a567-000000001103
Index Date 2019-02-07T19:04:37-07:00
Original Format ISO-USGIN
Original Version 1.2

Author

Name Jared Peacock
Position primary contact
Organization United States Geological Survey
Email jpeacock@usgs.gov

Geographic Extent

North Bound 44.00190129289
South Bound 42.325776601648
East Bound -111.48740234375
West Bound -116.72138671875