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Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990; Station mt04


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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 [...]


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USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP_Mid_03.edi 17.18 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP_Mid_02.edi 17.18 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP_Mid_01.edi 17.17 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP_Low_04.edi 17.07 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP_Low_03.edi 17.07 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP_Low_02.edi 17.07 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP_Low_01.edi 17.08 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP_High_03.edi 29 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP_High_02.edi 29 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP_High_01.edi 29 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-CP.edi 51.34 KB text/plain
SJ0L4_4cp.txt 7.99 KB text/plain
SJ0L4_4cp.bin 5 KB application/octet-stream
SJ0L4_3cp.txt 7.96 KB text/plain
SJ0L4_3cp.bin 5 KB application/octet-stream
SJ0L4_2cp.txt 8.02 KB text/plain
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SJ0L4_28ts.txt 33.31 KB text/plain
SJ0L4_27ts.txt 34.06 KB text/plain
SJ0L4_26ts.txt 33.47 KB text/plain
SJ0L4_25ts.txt 33.39 KB text/plain
SJ0L4_1cp.txt 8.01 KB text/plain
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SJ0D4_9ts.txt 35.6 KB text/plain
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SJ0D4_8ts.txt 35.61 KB text/plain
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SJ0D4_7ts.txt 35.91 KB text/plain
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SJ0D4_6ts.txt 36.04 KB text/plain
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SJ0D4_5ts.txt 34.85 KB text/plain
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SJ0D4_4ts.txt 35.55 KB text/plain
SJ0D4_4ts.bin 13 KB application/octet-stream
SJ0D4_3ts.txt 35.73 KB text/plain
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SJ0D4_3cp.txt 8.71 KB text/plain
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SJ0D4_2ts.txt 36.38 KB text/plain
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SJ0D4_2cp.txt 8.67 KB text/plain
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SJ0D4_24ts.txt 33.7 KB text/plain
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SJ0D4_23ts.txt 33.87 KB text/plain
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SJ0D4_22ts.txt 34.17 KB text/plain
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SJ0D4_21ts.txt 33.88 KB text/plain
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SJ0D4_20ts.txt 33.1 KB text/plain
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SJ0D4_1ts.txt 35.16 KB text/plain
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SJ0D4_1cp.txt 8.67 KB text/plain
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SJ0D4_19ts.txt 33 KB text/plain
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SJ0D4_18ts.txt 33.79 KB text/plain
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SJ0D4_17ts.txt 34.17 KB text/plain
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SJ0D4_16ts.txt 33.33 KB text/plain
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SJ0D4_15ts.txt 33.15 KB text/plain
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SJ0D4_14ts.txt 34.96 KB text/plain
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SJ0D4_13ts.txt 33.98 KB text/plain
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SJ0D4_12ts.txt 34.88 KB text/plain
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SJ0D4_11ts.txt 37.01 KB text/plain
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SJ0D4_10ts.txt 36.15 KB text/plain
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SJ004_3cp.txt 20.47 KB text/plain
SJ004_2cp.txt 20.44 KB text/plain
SJ004_1cp.txt 20.44 KB text/plain
“Raster plot of the phase angle and apparent resitivity for the station.”
thumbnail 179.43 KB image/png
Loma_Prieta_1989_Data_Quality_site-04.csv 3.09 KB text/csv
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT04-TS_EDI.txt 1.98 KB text/plain 478.68 KB application/zip
Loma_Prieta_1989_site-04_Config.jpg thumbnail 1.14 MB image/jpeg
Loma_Prieta_1989_site-04_Log.jpg thumbnail 1.23 MB image/jpeg


The 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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