Brian D. Rodriguez 20161121 1 ASCII and Binary Digital Data Denver, CO U.S. Geological Survey http://dx.doi.org/10.5066/F7SJ1HPT Willims, Jackie M. Rodriguez, Brian, D. 2007 PDF Open File Report 2007-1291 Denver, CO US Geologial Survey http://pubs.usgs.gov/of/2007/1291/ This dataset includes the magnetotelluric (MT) sounding data collected in 2006 in the Southern San Luis Valley, Colorado. The U.S. Geological Survey conducted a series of multidisciplinary studies, including MT surveys, in the San Luis Valley to improve understanding of the hydrogeology of the Santa Fe Group and the nature of the sedimentary deposits comprising the principal groundwater aquifers of the Rio Grande rift. The shallow unconfined and the deeper confined Santa Fe Group aquifers in the San Luis Basin are the main sources of municipal water for the region. The population of the San Luis Valley region is growing rapidly and water shortfalls could have serious consequences. Future growth and land management in the region depend on accurate assessment and protection of the region's groundwater resources. The purpose of this data release is provide MT station locations and data to the public. Detailed geologic mapping, high-resolution airborne magnetic surveys, gravity surveys, an electromagnetic survey, called magnetotellurics (MT), and hydrologic and lithologic data are being used to better understand the aquifer systems. The primary goal of the MT survey is to map changes in electrical resistivity with depth that are related to differences in rock type. Aquifer properties can be characterized by these variations in rock types. This data product contains magnetotelluric (MT) transfer functions (TFs), which define the frequency dependent linear relations between components of electromagnetic (EM) field variations measured at a single site. Two sorts of TF are provided for most sites. All of the TFs provide input data for subsequent MT inversion and interpretation. They are estimated from the raw EM time series by (a) Fourier transforming data in a series of short overlapping time windows, and (b) applying robust regression methods to the resulting sequence of Fourier coefficients. For remote reference estimates data from a second site are used for noise cancellation, and to reduce bias due to noise in the predicting magnetic channels. Apparent resistivities and phases, which can be computed from the off-diagonal components of the impedance tensors, are frequently used in 2D interpretations. The EMTF data product includes estimates of the TFs for a range of periods (which may vary, depending on instrumentation and deployment time), as well as estimation error covariances. For more information on the processing description for these data visit http://pubs.usgs.gov/of/2007/1291/pdf/OF07-1291_508.pdf/. For more information on Magnetotelluric Transfer Functions please visit the Incorporated Research Institutions For Seismology (IRIS) Data Services Products. For more information on the EDI data format: Wight, D.E., 1988, MT/EMAP Data Interchange Standard, Technical standards committee report, Society of Exploration Geophysicists, isbn=9780931830617, http://www.seg.org/documents/10161/77915/seg_mt_emap_1987.pdf. This report can be downloaded for free from the Society of Exploration Geophysics (SEG) Technical Standards website, http://seg.org/Publications/SEG-Technical-Standards. This metadata documents the full suite of MT data for this site and includes the files below. Their contents are described in the entity and attribute section of the metadata: BF4-9820.RSP BF4-9821.RSP BF7-0001.RSP EF-9608X.RSP EF-9608Y.RSP SL12M1.TS1 SL12M1.TS2 SL12M1.TS3 SL12M1.TS4 SL12M2.TS2 SL12M2.TS3 SL12M3.TS2 SL12M3.TS3 SL12M4.TS2 SL12M4.TS3 SL12M5.TS2 SL12M6.TS2 SL12N1.TS1 SL12N1.TS2 SL12N1.TS3 SL12N2.TS2 SL12N2.TS3 SL12N3.TS2 SL12N3.TS3 SL12N4.TS2 SL12N4.TS3 USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_High_01.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_High_02.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_01.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_02.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_03.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_04.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_05.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_06.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_07.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_08.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_01.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_02.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_03.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_04.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_05.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_06.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_07.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_08.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_09.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_10.txt USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_xLow_01.txt 20060808 20060808 ground condition Complete Not planned -105.4918825 -105.4918825 37.366544891 37.366544891 ISO 19115 Topic Category geoscientificinformation None impedance tipper apparent resistivity impedance phase impedance strike MT magnetotelluric sounding USGS Thesaurus Magnetic field (earth) Geophysics GPS measurement Electromagnetic surveying Magnetic surveying USGS Metadata Identifier USGS:57e41d46e4b0908250060e97 USGS Geographic Names Information System (GNIS) Rocky Mountains San Luis Valley Colorado Costilla County Please see 'Distribution Info' for details. There is no guarantee concerning the accuracy of the data. Any user who modifies the data is obligated to describe the types of modifications they perform. Data have been checked to ensure the accuracy. If any errors are detected, please notify the originating office. The U.S. Geological Survey strongly recommends that careful attention be paid to the metadata file associated with these data. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer. USGS - Crustal Geophysics and Geochemistry Science Center Brian D. Rodriguez Research Geophysicist Physical

Mail Stop 964, West 6th Ave. & Kipling St., DFC Bldg. 20

Denver CO 80225-0046 US 303-236-1361 brod@usgs.gov Data collected by Brian D. Rodriguez and Jackie M. Williams of the Crustal Geophysics and Geochemistry Science Center. This project was funded by US Geological Survey (USGS) Minerals Resources Program (MRP), USGS National Cooperative Geologic Mapping Program in cooperation with the US Bureau of Land Management (BLM). MS-DOS version 6.22 Drenth, B.J. Grauch, V.J.S. Rodriguez, B.D. 2013 PDF The Geological Society of America Special Paper 494 Boulder, CO Geological Society of America http://specialpapers.gsapubs.org/content/494/75.full.pdf+html MS-DOS version 6.22 Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Spatial locations were determined from hand-held global positioning system (GPS) devices. In general, the GPS units used by field scientists recorded sample locations to within 100 feet (30 meters) of the true location. The locations were verified using a geographic information system (GIS) and digital topographic maps. Elevations were determined from USGS, The National Map, Bulk Point Query Service based on the USGS 3DEP (3D elevation program) 1/3 arc-second layer (10-meter). Vertical accuracy was not assessed for this specific dataset. The overall absolute vertical accuracy of the seamless DEMs within the conterminous United States (2013), expressed as the root mean square error (RMSE) of 25,310 reference points, was 1.55 meters (USGS, 2014 - http://dx.doi.org/10.3133/ofr20141008). The vertical accuracy varies across the U.S. as a result of differences in source DEM quality, terrain relief, land cover, and other factors. Acquire multiple high frequency time series files (TS1 file extension) and convert to intermediate spectra cross power files (BP1 file extension) 20060808 Acquire multiple mid frequency time series files (TS2 file extension) and convert to intermediate spectra cross power files (BP2 file extension) 20060808 Acquire multiple low frequency time series files (TS3 file extension) and convert to intermediate spectra cross power files (BP3 file extension) 20060808 Combine mulitiple frequency band (high, mid, low) BP cross power files into a single cross power file (AVG file extension) 20061006 Convert cross power AVG file to spectra edi file 20151113 Rotate data and convert spectra edi file to GeotoolsMT Transfer Function dump file 20151113 Mine AVG, spectra edi, and dump file to create Transfer Function edi file 20160902 Point Entity point 1 0.0196481178 0.0409100603 Decimal degrees NAD27 CONUS Clarke 1866 6378206.4 294.9786982 Text File BF4-9820.RSP System Calibration File Electromagnetic Instruments (EMI) Freq Frequency - Hz U.S. Geological Survey Frequency - Hz Amp Amplitude - Volts/Gamma U.S. Geological Survey Amplitude - Volts/Gamma Phz Phase - Degrees U.S. Geological Survey Phase - Degrees Text File BF4-9821.RSP System Calibration File Electromagnetic Instruments (EMI) Freq Frequency - Hz U.S. Geological Survey Frequency - Hz Amp Amplitude - Volts/Gamma U.S. Geological Survey Amplitude - Volts/Gamma Phz Phase - Degrees U.S. Geological Survey Phase - Degrees Text File BF7-0001.RSP System Calibration File Electromagnetic Instruments (EMI) Freq Frequency - Hz U.S. Geological Survey Frequency - Hz Amp Amplitude - Volts/Gamma U.S. Geological Survey Amplitude - Volts/Gamma Phz Phase - Degrees U.S. Geological Survey Phase - Degrees Text File EF-9608X.RSP System Calibration File listing 4 columns of amplitude and phase for each of the 4 possible instrument gains (10dB, 20dB, 30dB, 40dB) Electromagnetic Instruments (EMI) Freq Frequency - Hz U.S. Geological Survey Frequency - Hz Amp Amplitude - unitless. Amplitude is unique for each gain (10dB, 20dB, 30dB, 40dB). U.S. Geological Survey Amplitude - unitless Phz Phase - Degrees. Phase is unique for each sgain (10dB, 20dB, 30dB, 40dB). U.S. Geological Survey Phase - Degrees Text File EF-9608Y.RSP System Calibration File listing 4 columns of amplitude and phase for each of the 4 possible instrument gains (10dB, 20dB, 30dB, 40dB). Electromagnetic Instruments (EMI) Freq Frequency - Hz U.S. Geological Survey Frequency - Hz Amp Amplitude - unitless. Amplitude is unique for each gain (10dB, 20dB, 30dB, 40dB). U.S. Geological Survey Amplitude - unitless Phz Phase - Degrees. Phase is unique for each sgain (10dB, 20dB, 30dB, 40dB). U.S. Geological Survey Phase - Degrees Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12.edi Transfer Function EDI File U.S. Geological Survey FREQ Data block containing a set of frequencies in hertz (Hz.) It defines the frequency set for succeeding data within that data section which are functions of frequency. U.S. Geological Survey Data block containing a set of frequencies in hertz (Hz.) It defines the frequency set for succeeding data within that data section which are functions of frequency. ZROT Data block containing a set of rotation angles in degrees used for impedances. U.S. Geological Survey Data block containing a set of rotation angles in degrees used for impedances. ZXXR Real component of impedance Zxx in ohm-m (Ex / Hx) U.S. Geological Survey Real component of impedance Zxx in ohm-m (Ex / Hx) ZXXI Imaginary component of impedance Zxx in ohm-m (Ex / Hx) U.S. Geological Survey Imaginary component of impedance Zxx in ohm-m (Ex / Hx) ZXX.VAR Variance of real and imaginary impedance of Zxx in ohm-m U.S. Geological Survey Variance of real and imaginary impedance of Zxx in ohm-m ZXYR Real component of impedance Zxy in ohm-m (Ex / Hy ) U.S. Geological Survey Real component of impedance Zxy in ohm-m (Ex / Hy ) ZXYI Imaginary component of impedance Zxy in ohm-m (Ex / Hy ) U.S. Geological Survey Imaginary component of impedance Zxy in ohm-m (Ex / Hy ) ZXY.VAR Variance of real and imaginary impedance of Zxy in ohm-m U.S. Geological Survey Variance of real and imaginary impedance of Zxy in ohm-m ZYXR Real component of impedance Zyx in ohm-m (Ey / Hx ) U.S. Geological Survey Real component of impedance Zyx in ohm-m (Ey / Hx ) ZYXI Imaginary component of impedance Zyx in ohm-m (Ey / Hx ) U.S. Geological Survey Imaginary component of impedance Zyx in ohm-m (Ey / Hx ) ZYX.VAR Variance of real and imaginary impedance of Zyx in ohm-m U.S. Geological Survey Variance of real and imaginary impedance of Zyx in ohm-m ZYYR Real component of impedance Zyy in ohm-m ( Ey / Hy ) U.S. Geological Survey Real component of impedance Zyy in ohm-m ( Ey / Hy ) ZYYI Imaginary component of impedance Zyy in ohm-m (Ey / Hy ) U.S. Geological Survey Imaginary component of impedance Zyy in ohm-m (Ey / Hy ) ZYY.VAR Variance of real and imaginary impedance of Zyy in ohm-m U.S. Geological Survey Variance of real and imaginary impedance of Zyy in ohm-m TXR.EXP Real part of complex tipper component Tx. U.S. Geological Survey Real part of complex tipper component Tx. TXI.EXP Imaginary part of complex tipper component Tx. U.S. Geological Survey Imaginary part of complex tipper component Tx. TXVAR.EXP Variance of complex tipper component Tx. U.S. Geological Survey Variance of complex tipper component Tx. TYR.EXP Real part of complex tipper component Ty. U.S. Geological Survey Real part of complex tipper component Ty. TYI.EXP Imaginary part of complex tipper component Ty. U.S. Geological Survey Imaginary part of complex tipper component Ty. TYVAR.EXP Variance of complex tipper component Ty. U.S. Geological Survey Variance of complex tipper component Ty. RHOROT Data block containing a set of rotation angles in degrees used for apparent resistivities. U.S. Geological Survey Data block containing a set of rotation angles in degrees used for apparent resistivities. RHOXX Magnitude of apparent resistivity (ohm-m) computed from Zxx U.S. Geological Survey Magnitude of apparent resistivity (ohm-m) computed from Zxx PHSXX Phase angle of apparent resistivity (deg) computed from Zxx U.S. Geological Survey Phase angle of apparent resistivity (deg) computed from Zxx RHOXX.ERR Log10 error bar (in decades) associated with Rhoxx U.S. Geological Survey Log10 error bar (in decades) associated with Rhoxx PHSXX.ERR Error bar (in degrees) associated with Phsxx U.S. Geological Survey Error bar (in degrees) associated with Phsxx RHOXY Magnitude of apparent resistivity (ohm-m) computed from Zxy U.S. Geological Survey Magnitude of apparent resistivity (ohm-m) computed from Zxy PHSXY Phase angle of apparent resistivity (deg) computed from Zxy U.S. Geological Survey Phase angle of apparent resistivity (deg) computed from Zxy RHOXY.ERR Log10 error bar (in decades) associated with Rhoxy U.S. Geological Survey Log10 error bar (in decades) associated with Rhoxy PHSXY.ERR Error bar (in degrees) associated with Phsxy U.S. Geological Survey Error bar (in degrees) associated with Phsxy RHOYX Magnitude of apparent resistivity (ohm-m) computed from Zyx U.S. Geological Survey Magnitude of apparent resistivity (ohm-m) computed from Zyx PHSYX Phase angle of apparent resistivity (deg) computed from Zyx U.S. Geological Survey Phase angle of apparent resistivity (deg) computed from Zyx RHOYX.ERR Log10 error bar (in decades) associated with Rhoyx U.S. Geological Survey Log10 error bar (in decades) associated with Rhoyx PHSYX.ERR Error bar (in degrees) associated with Phsyx U.S. Geological Survey Error bar (in degrees) associated with Phsyx RHOYY Magnitude of apparent resistivity (ohm-m) computed from Zyy U.S. Geological Survey Magnitude of apparent resistivity (ohm-m) computed from Zyy PHSYY Phase angle of apparent resistivity (deg) computed from Zyy U.S. Geological Survey Phase angle of apparent resistivity (deg) computed from Zyy RHOYY.ERR Log10 error bar (in decades) associated with Rhoyy U.S. Geological Survey Log10 error bar (in decades) associated with Rhoyy PHSYY.ERR Error bar (in degrees) associated with Phsyy U.S. Geological Survey Error bar (in degrees) associated with Phsyy TIPMAG Magnitude of total tipper U.S. Geological Survey Magnitude of total tipper TIPPHS Phase angle (deg) of total tipper U.S. Geological Survey Phase angle (deg) of total tipper TIPMAG.ERR Error bar associated with TIPMAG U.S. Geological Survey Error bar associated with TIPMAG TIPPHS.ERR Error bar (in degrees) associated with TIPPHS U.S. Geological Survey Error bar (in degrees) associated with TIPPHS ZSTRIKE Impedance strike angle (deg) computed from the impedance tensor Z U.S. Geological Survey Impedance strike angle (deg) computed from the impedance tensor Z ZSKEW Impedance skew computed from the impedance tensor Z U.S. Geological Survey Impedance skew computed from the impedance tensor Z TSTRIKE Tipper strike angle (deg) computed from the tipper tensor T U.S. Geological Survey Tipper strike angle (deg) computed from the tipper tensor T COH Ordinary coherency between any two measurements as a function of freq. U.S. Geological Survey Ordinary coherency between any two measurements as a function of freq. EPREDCOH Multiple coherency relationship between an E measurement, and a predicted E measurement derived from two H measurements and a tensor impedance Z. U.S. Geological Survey Multiple coherency relationship between an E measurement, and a predicted E measurement derived from two H measurements and a tensor impedance Z. SIGAMP Signal amplitude (or power) spectra for a measurement as a function of frequency. U.S. Geological Survey Signal amplitude (or power) spectra for a measurement as a function of frequency. SIGNOISE Signal-to-noise ratio for a measurement as a function of frequency. U.S. Geological Survey Signal-to-noise ratio for a measurement as a function of frequency. Binary File SL12M1.TS1 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M1.TS2 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M1.TS3 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M1.TS4 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M2.TS2 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M2.TS3 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M3.TS2 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M3.TS3 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M4.TS2 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M4.TS3 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M5.TS2 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12M6.TS2 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12N1.TS1 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12N1.TS2 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12N1.TS3 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12N2.TS2 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12N2.TS3 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12N3.TS2 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12N3.TS3 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12N4.TS2 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Binary File SL12N4.TS3 Raw Time Series Binary Data File. The header information for this file contains field notes including survey identifier, personnel, date/time, weather, indication of a remote MT site, additional comments and sensor configuration for the electric and magnetic field channels. U.S. Geological Survey Data Value Binary Data Value U.S. Geological Survey Binary Data Value Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_High_01.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_High_02.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_01.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_02.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_03.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_04.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_05.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_06.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_07.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Low_08.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_01.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_02.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_03.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_04.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_05.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_06.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_07.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_08.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_09.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_Mid_10.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2006-MT12-TS_xLow_01.txt Header file in ASCII text format for raw binary time series files U.S. Geological Survey Header Information Header description and settings for time series binary content U.S. Geological Survey Header description and settings for time series binary content MT/EMAP Data Interchange Standard, Revision 1.0, Dec 1987, David E. Wight. This standard was never published in Geophysics. For more information on the EDI data format: Wight, D.E., 1988, MT/EMAP Data Interchange Standard, Technical standards committee report, Society of Exploration Geophysicists, isbn=9780931830617, http://www.seg.org/documents/10161/77915/seg_mt_emap_1987.pdf. U.S. Geological Survey - ScienceBase U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. MT / EMAP Data Interchange Standard Electrical Data Interchange (EDI) Standard. 10.2.2 None 999 http://dx.doi.org/10.5066/F7SJ1HPT None. No fees are applicable for obtaining the data set. 20200929 Philip Brown U.S. Geological Survey, Southwest Region Geophysicist Physical

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