Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990; Station mt02

Dates

Publication Date: 2022-08-02
Start Date: 1989-05-02
End Date: 1989-05-02

Citation

Rodriguez, B.D., Brown, P.J., Johnson, M.R., McClees-Funinan, R., Powell, A.S., and Enns, K.D., 2022, Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990: U.S. Geological Survey data release, https://doi.org/10.5066/P9DIJHDK.

Summary

The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Science Analytics and Synthesis (SAS) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Loma Prieta, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989 and 1994. The magnetotelluric data selected for this preservation project were collected in 1989 and 1990 using USGS portable truck mounted systems that measure the distribution of electrical conductivity beneath the surface of the earth. Truck mounted systems of this era output data to 3.5” discs, from which data were recovered and transformed to binary [...]

Summary

The U.S. Geological Survey (USGS) Geology, Geophysics and Geochemistry Science Center (GGGSC) collaborated with the USGS Science Analytics and Synthesis (SAS) team to preserve and release a subset of magnetotelluric data from the San Andreas Fault in Loma Prieta, California. The San Andreas Fault data were collected by the Branch of Geophysics, a precursor to the now GGGSC, between 1989 and 1994. The magnetotelluric data selected for this preservation project were collected in 1989 and 1990 using USGS portable truck mounted systems that measure the distribution of electrical conductivity beneath the surface of the earth. Truck mounted systems of this era output data to 3.5” discs, from which data were recovered and transformed to binary or ASCII formats using proprietary software. This USGS data release includes the original binary and ASCII data files and derivative EDI files (Wight, 1988), a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team.

References Cited
Wight, D.E., 1988, MT/EMAP Data Interchange Standard, Technical standards committee report, Society of Exploration Geophysicists, isbn=9780931830617, https://www.seg.org/Portals/0/SEG/News%20and%20Resources/Technical%20Standards/seg_mt_emap_1987.pdf.

Contacts

Point of Contact :: Brian D Rodriguez
Originator :: Brian D Rodriguez, Philip J Brown II, Michaela R Johnson, Ricardo McClees-Funinan, A. Shafer Powell, Kyle D Enns
Metadata Contact :: Philip J Brown II, GS GGGSC DM Team
Publisher :: U.S. Geological Survey
USGS Mission Area :: Energy and Minerals
USGS Program :: Mineral Resources Program
SDC Owner :: Geology, Geophysics, and Geochemistry Science Center
Distributor :: U.S. Geological Survey - ScienceBase

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Magnetotelluric-Data-from-the-San-Andreas-Fault_Loma_Prieta-CA_1989-1990_Project_Station-mt02-Metadata.xml Original FGDC Metadata	View	36.25 KB	application/fgdc+xml
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT02-CP_Low_03.edi		17.08 KB	text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT02-CP_Low_02.edi		17.08 KB	text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT02-CP_Low_01.edi		17.08 KB	text/plain
SJ002L_3cp.txt		7.6 KB	text/plain
SJ002L_3cp.bin		5 KB	application/octet-stream
SJ002L_2cp.txt		7.58 KB	text/plain
SJ002L_2cp.bin		5 KB	application/octet-stream
SJ002L_1cp.txt		7.58 KB	text/plain
SJ002L_1cp.bin		5 KB	application/octet-stream
SJ002L3ts.txt		34.21 KB	text/plain
SJ002L3ts.bin		13 KB	application/octet-stream
SJ002L2ts.txt		34.22 KB	text/plain
SJ002L2ts.bin		13 KB	application/octet-stream
SJ002L1ts.txt		34.33 KB	text/plain
SJ002L1ts.bin		13 KB	application/octet-stream
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT02-TS_Low_1.edi		70.97 KB	text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT02-TS_Low_2.edi		70.96 KB	text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT02-TS_Low_3.edi		70.96 KB	text/plain
Loma_Prieta_1989_Data_Quality_site-02.csv		452 Bytes	text/csv
Loma_Prieta_1989_site-02_Config.jpg		1.07 MB	image/jpeg
Loma_Prieta_1989_site-02_Log.jpg		1.38 MB	image/jpeg

Related External Resources

Type: Citation

DAR_Magnetotelluric: Software to Process and Preserve Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989 (Version 1)	https://doi.org/10.5066/F71Z43P9

Type: Related Primary Publication

Unsworth, M., Egbert, G., and Booker, J., 1999, High-resolution electromagnetic imaging of the San Andreas Fault in central California: Journal of Geophysical Research: Solid Earth, v. 104, no. B1, p. 1131–1150, https://doi.org/10.1029/98JB01755.	https://doi.org/10.1029/98JB01755

Purpose

These magnetotelluric data that were previously locked in an inaccessible format are now readily available as a result of open-source software. The released information could help increase understanding of the San Andreas Fault system, which runs the length of California, as well as fault systems elsewhere. Seismic activity can pose potential hazards and great risk to communities in surrounding areas. Using the framework developed in this preservation effort to make more magnetotelluric data available will deepen our knowledge of fault systems and in turn benefit public welfare.

Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990; Station mt02

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