Brian D. Rodriguez
20170630
Magnetotelluric sounding data, station 29, San Luis Valley, Colorado, 2007
1
ASCII and Binary Digital Data
Denver, CO
U.S. Geological Survey
https://doi.org/10.5066/F77942VF
Willims, Jackie M.
Rodriguez, Brian, D.
2007
Magnetotelluric Data, San Luis Valley, Colorado
PDF
Open File Report
2007-1405
Denver, CO
US Geologial Survey
http://pubs.usgs.gov/of/2007/1405/
This dataset includes the magnetotelluric (MT) sounding data collected in 2007 in and near the 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/2007/1405/pdf/of2007-1405.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
SL29M1.TS1
SL29M1.TS2
SL29M1.TS3
SL29M2.TS2
SL29M2.TS3
SL29M3.TS2
SL29M3.TS3
SL29M4.TS2
USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2007-MT29.edi
USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2007-MT29-TS_High_01.txt
USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2007-MT29-TS_Low_01.txt
USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2007-MT29-TS_Low_02.txt
USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2007-MT29-TS_Low_03.txt
USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2007-MT29-TS_Mid_01.txt
USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2007-MT29-TS_Mid_02.txt
USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2007-MT29-TS_Mid_03.txt
USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2007-MT29-TS_Mid_04.txt
20070714
20070714
ground condition
Not planned
-105.636897167
-105.636897167
37.760388333
37.760388333
ISO 19115 Topic Category
geoscientificinformation
None
impedance
tipper
apparent resistivity
impedance phase
impedance strike
MT
magnetotelluric
sounding
Crustal Geophysics and Geochemistry Science Center
CGGSC
Mineral Resources Program
MRP
USGS Thesaurus
Magnetic field (earth)
Geophysics
GPS measurement
Electromagnetic surveying
Magnetic surveying
groundwater
aquifer
hydrogeology
USGS Metadata Identifier
USGS:5841df36e4b04fc80e518cf5
USGS Geographic Names Information System (GNIS)
Rocky Mountains
San Luis Valley
Colorado
Saguache 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
Geophysical constraints on Rio Grande rift structure in the central San Luis Basin, Colorado and New Mexico, in, Hudson, M.R., and Grauch, V.J.S., eds., New Perspectives on Rio Grande Rift Basins: From Tectonics to Groundwater
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)
20070714
Acquire multiple mid frequency time series files (TS2 file extension) and convert to intermediate spectra cross power files (BP2 file extension)
20070714
Acquire multiple low frequency time series files (TS3 file extension) and convert to intermediate spectra cross power files (BP3 file extension)
20070714
Combine mulitiple frequency band (high, mid, low) BP cross power files into a single cross power file (AVG file extension)
20070924
Convert cross power AVG file to spectra edi file
20151113
Rotate data and convert spectra edi file to GeotoolsMT Transfer Function dump file
20151112
Mine AVG, spectra edi, and dump file to create Transfer Function edi file
20161121
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-2007-MT29.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 SL29M1.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 SL29M1.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 SL29M1.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 SL29M2.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 SL29M2.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 SL29M3.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 SL29M3.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 SL29M4.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
Text File USA-Colorado-Rio_Grande_Rift-San_Luis_Basin-2007-MT29-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-2007-MT29-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-2007-MT29-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-2007-MT29-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-2007-MT29-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-2007-MT29-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-2007-MT29-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-2007-MT29-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
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
Denver Federal Center, Building 810, Mail Stop 302
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
54.6KB
http://www.seg.org/documents/10161/77915/seg_mt_emap_1987.pdf
None. No fees are applicable for obtaining the data set.
20220912
Philip Brown
U.S. Geological Survey, Southwest Region
Geophysicist
Physical
Mail Stop 964, West 6th Ave. and Kipling St., DFC Bldg. 20
Denver
CO
80225-0046
US
303-236-1310
pbrown@usgs.gov
FGDC Content Standard for Digital Geospatial Metadata
FGDC-STD-001-1998