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Magnetotelluric Data from the San Andreas Fault, Loma Prieta CA, 1989-1990; Station mt09


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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-MT09-CP_Mid_02.edi 17.18 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-CP_Mid_01.edi 17.17 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-CP_Low_04.edi 17.08 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-CP_Low_03.edi 17.08 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-CP_Low_02.edi 17.08 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-CP_Low_01.edi 17.08 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-CP_High_02.edi 28.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-CP_High_01.edi 28.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-CP.edi 51.7 KB text/plain
SJL09_4cp.txt 8.25 KB text/plain
SJL09_4cp.bin 5 KB application/octet-stream
SJL09_3cp.txt 8.26 KB text/plain
SJL09_3cp.bin 5 KB application/octet-stream
SJL09_2cp.txt 8.19 KB text/plain
SJL09_2cp.bin 5 KB application/octet-stream
SJL09_20ts.txt 32.78 KB text/plain
SJL09_20ts.bin 13 KB application/octet-stream
SJL09_1cp.txt 8.21 KB text/plain
SJL09_1cp.bin 5 KB application/octet-stream
SJL09_19ts.txt 33.2 KB text/plain
SJL09_19ts.bin 13 KB application/octet-stream
SJL09_18ts.txt 32.35 KB text/plain
SJL09_18ts.bin 13 KB application/octet-stream
SJL09_17ts.txt 32.14 KB text/plain
SJL09_17ts.bin 13 KB application/octet-stream
SJD09_9ts.txt 35.09 KB text/plain
SJD09_9ts.bin 13 KB application/octet-stream
SJD09_8ts.txt 34.23 KB text/plain
SJD09_8ts.bin 13 KB application/octet-stream
SJD09_7ts.txt 33.94 KB text/plain
SJD09_7ts.bin 13 KB application/octet-stream
SJD09_6ts.txt 33.11 KB text/plain
SJD09_6ts.bin 13 KB application/octet-stream
SJD09_5ts.txt 33.53 KB text/plain
SJD09_5ts.bin 13 KB application/octet-stream
SJD09_4ts.txt 34.37 KB text/plain
SJD09_4ts.bin 13 KB application/octet-stream
SJD09_3ts.txt 34.11 KB text/plain
SJD09_3ts.bin 13 KB application/octet-stream
SJD09_2ts.txt 34.89 KB text/plain
SJD09_2ts.bin 13 KB application/octet-stream
SJD09_2cp.txt 8.75 KB text/plain
SJD09_2cp.bin 5 KB application/octet-stream
SJD09_1ts.txt 34.27 KB text/plain
SJD09_1ts.bin 13 KB application/octet-stream
SJD09_1cp.txt 8.8 KB text/plain
SJD09_1cp.bin 5 KB application/octet-stream
SJD09_16ts.txt 35.19 KB text/plain
SJD09_16ts.bin 13 KB application/octet-stream
SJD09_15ts.txt 35.05 KB text/plain
SJD09_15ts.bin 13 KB application/octet-stream
SJD09_14ts.txt 34.9 KB text/plain
SJD09_14ts.bin 13 KB application/octet-stream
SJD09_13ts.txt 34.66 KB text/plain
SJD09_13ts.bin 13 KB application/octet-stream
SJD09_12ts.txt 34.73 KB text/plain
SJD09_12ts.bin 13 KB application/octet-stream
SJD09_11ts.txt 34.97 KB text/plain
SJD09_11ts.bin 13 KB application/octet-stream
SJD09_10ts.txt 34.5 KB text/plain
SJD09_10ts.bin 13 KB application/octet-stream
SJ09_2cp.txt 20.93 KB text/plain
SJ09_2cp.bin 10.75 KB application/octet-stream
SJ09_1cp.txt 20.94 KB text/plain
SJ09_1cp.bin 10.75 KB application/octet-stream
“Raster plot of the phase angle and apparent resitivity for the station.”
thumbnail 160.4 KB image/png
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_9.edi 70.98 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_10.edi 70.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_11.edi 70.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_12.edi 70.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_13.edi 70.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_14.edi 70.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_15.edi 70.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_16.edi 70.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Low_1.edi 70.98 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Low_2.edi 70.98 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Low_3.edi 70.98 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Low_4.edi 70.98 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_1.edi 70.98 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_2.edi 70.98 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_3.edi 70.98 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_4.edi 70.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_5.edi 70.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_6.edi 70.98 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_7.edi 70.99 KB text/plain
USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT09-TS_Mid_8.edi 70.99 KB text/plain
Loma_Prieta_1989_Data_Quality_site-09.csv 2.22 KB text/csv
Loma_Prieta_1989_site-09_Config.jpg thumbnail 1.77 MB image/jpeg
Loma_Prieta_1989_site-09_Log.jpg thumbnail 1.42 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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