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Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990; Station mt08


Publication Date


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,


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 [...]


Attached Files

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USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT08-CP_Mid_03.edi 17.18 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT08-CP_Mid_02.edi 17.18 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT08-CP_Mid_01.edi 17.17 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT08-CP_Low_02.edi 17.08 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT08-CP_Low_01.edi 17.08 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT08-CP_High_02.edi 29 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT08-CP_High_01.edi 29 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT08-CP.edi 53.24 KB text/plain
SJL08_2cp.txt 8.38 KB text/plain
SJL08_2cp.bin 5 KB application/octet-stream
SJL08_26ts.txt 33.12 KB text/plain
SJL08_26ts.bin 13 KB application/octet-stream
SJL08_25ts.txt 32.42 KB text/plain
SJL08_25ts.bin 13 KB application/octet-stream
SJL08_1cp.txt 8.34 KB text/plain
SJL08_1cp.bin 5 KB application/octet-stream
SJD08_9ts.txt 35 KB text/plain
SJD08_9ts.bin 13 KB application/octet-stream
SJD08_8ts.txt 35.01 KB text/plain
SJD08_8ts.bin 13 KB application/octet-stream
SJD08_7ts.txt 35.36 KB text/plain
SJD08_7ts.bin 13 KB application/octet-stream
SJD08_6ts.txt 35.94 KB text/plain
SJD08_6ts.bin 13 KB application/octet-stream
SJD08_5ts.txt 34.53 KB text/plain
SJD08_5ts.bin 13 KB application/octet-stream
SJD08_4ts.txt 35.44 KB text/plain
SJD08_4ts.bin 13 KB application/octet-stream
SJD08_3ts.txt 34.75 KB text/plain
SJD08_3ts.bin 13 KB application/octet-stream
SJD08_3cp.txt 9.06 KB text/plain
SJD08_3cp.bin 5 KB application/octet-stream
SJD08_2ts.txt 35.01 KB text/plain
SJD08_2ts.bin 13 KB application/octet-stream
SJD08_2cp.txt 9 KB text/plain
SJD08_2cp.bin 5 KB application/octet-stream
SJD08_24ts.txt 35.68 KB text/plain
SJD08_24ts.bin 13 KB application/octet-stream
SJD08_23ts.txt 35.5 KB text/plain
SJD08_23ts.bin 13 KB application/octet-stream
SJD08_22ts.txt 35.84 KB text/plain
SJD08_22ts.bin 13 KB application/octet-stream
SJD08_21ts.txt 36.81 KB text/plain
SJD08_21ts.bin 13 KB application/octet-stream
SJD08_20ts.txt 35.43 KB text/plain
SJD08_20ts.bin 13 KB application/octet-stream
SJD08_1ts.txt 34.88 KB text/plain
SJD08_1ts.bin 13 KB application/octet-stream
SJD08_1cp.txt 9.05 KB text/plain
SJD08_1cp.bin 5 KB application/octet-stream
SJD08_19ts.txt 35.85 KB text/plain
SJD08_19ts.bin 13 KB application/octet-stream
SJD08_18ts.txt 35.09 KB text/plain
SJD08_18ts.bin 13 KB application/octet-stream
SJD08_17ts.txt 34.95 KB text/plain
SJD08_17ts.bin 13 KB application/octet-stream
SJD08_16ts.txt 36.17 KB text/plain
SJD08_16ts.bin 13 KB application/octet-stream
SJD08_15ts.txt 35.17 KB text/plain
SJD08_15ts.bin 13 KB application/octet-stream
SJD08_14ts.txt 36.45 KB text/plain
SJD08_14ts.bin 13 KB application/octet-stream
SJD08_13ts.txt 36.7 KB text/plain
SJD08_13ts.bin 13 KB application/octet-stream
SJD08_12ts.txt 35.71 KB text/plain
SJD08_12ts.bin 13 KB application/octet-stream
SJD08_11ts.txt 35.63 KB text/plain
SJD08_11ts.bin 13 KB application/octet-stream
SJD08_10ts.txt 35.69 KB text/plain
SJD08_10ts.bin 13 KB application/octet-stream
“Raster plot of the phase angle and apparent resitivity for the station.”
thumbnail 172.52 KB image/png
MSP03_2cp.bin 10.75 KB application/octet-stream
MSP03_1cp.bin 10.75 KB application/octet-stream
Loma_Prieta_1989_Data_Quality_site-08.csv 2.81 KB text/csv
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT08-TS_EDI.TXT 1.85 KB text/plain 456.47 KB application/zip
Loma_Prieta_1989_site-08_Config.jpg thumbnail 1.49 MB image/jpeg
Loma_Prieta_1989_site-08_Log.jpg thumbnail 1.53 MB image/jpeg


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.

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