Brian D. Rodriguez Philip J. Brown Michaela R. Johnson Ricardo McClees-Funinan A. Shafer Powell Kyle D. Enns 20220802 magnetotelluric data Additional information about Originators: Rodriguez, B.D., https://orcid.org/0000-0002-2263-611X; Brown, P.J., https://orcid.org/0000-0002-2415-7462; Johnson, M.R., https://orcid.org/0000-0001-6133-0247; McClees-Funinan, R., https://orcid.org/0000-0002-3254-1843; Powell, A.S., https://orcid.org/0000-0002-9622-0061; Enns, K.D., https://orcid.org/0000-0001-7675-697X Suggested Citation: Rodriguez, B.D., Brown, P.B., 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. https://doi.org/10.5066/P9DIJHDK Martyn Unsworth Gary Egbert John Booker 19990110 publication Journal of Geophysical Research: Solid Earth vol. 104, issue B1 n/a American Geophysical Union (AGU) ppg. 1131-1150 https://doi.org/10.1029/98JB01755 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. 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. Each station in the overall survey was taken at a single point. While the MT files are not in vector format all measurements are referenced to the location of the station. There were 10 site locations surveyed for this particular study. At the time of data collection surveyors received oral permission from landowners of each site to conduct magnetotelluric surveys on the land. The landowners from 1989 may or may not have changed. Potential site locations that did not receive oral permission from landowners were not surveyed and alternate sites were pursued instead. This adjustment affected the spatial distribution of the survey station locations. The site location points plotted in the shapefile are considered estimates, see horizontal accuracy report below for more details. References relevant to this release include: Wight, D., 1991, MT/EMAP Data Interchange Standard, The Society of Exploration Geophysicists. http://www.seg.org/documents/10161/77915/seg_mt_emap_1987.pdf. This child item includes the files Loma_Prieta_1989_Data_Quality_site-06.csv, Loma_Prieta_1989_site-06_Config.jpg, Loma_Prieta_1989_site-06_Log.jpg, mt06.png, SJ006_1cp.bin, SJ006_1cp.txt, SJ006_2cp.bin, SJ006_2cp.txt, SJ0D6_10ts.bin, SJ0D6_10ts.txt, SJ0D6_11ts.bin, SJ0D6_11ts.txt, SJ0D6_12ts.bin, SJ0D6_12ts.txt, SJ0D6_13ts.bin, SJ0D6_13ts.txt, SJ0D6_14ts.bin, SJ0D6_14ts.txt, SJ0D6_15ts.bin, SJ0D6_15ts.txt, SJ0D6_16ts.bin, SJ0D6_16ts.txt, SJ0D6_17ts.bin, SJ0D6_17ts.txt, SJ0D6_18ts.bin, SJ0D6_18ts.txt, SJ0D6_19ts.bin, SJ0D6_19ts.txt, SJ0D6_1cp.bin, SJ0D6_1cp.txt, SJ0D6_1ts.bin, SJ0D6_1ts.txt, SJ0D6_20ts.bin, SJ0D6_20ts.txt, SJ0D6_2cp.bin, SJ0D6_2cp.txt, SJ0D6_2ts.bin, SJ0D6_2ts.txt, SJ0D6_3ts.bin, SJ0D6_3ts.txt, SJ0D6_4ts.bin, SJ0D6_4ts.txt, SJ0D6_5ts.bin, SJ0D6_5ts.txt, SJ0D6_6ts.bin, SJ0D6_6ts.txt, SJ0D6_7ts.bin, SJ0D6_7ts.txt, SJ0D6_8ts.bin, SJ0D6_8ts.txt, SJ0D6_9ts.bin, SJ0D6_9ts.txt, SJ0L6_1cp.bin, SJ0L6_1cp.txt, SJ0L6_21ts.bin, SJ0L6_21ts.txt, SJ0L6_22ts.bin, SJ0L6_22ts.txt, SJ0L6_2cp.bin, SJ0L6_2cp.txt, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Low_1.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Low_2.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_1.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_2.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_3.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_4.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_5.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_6.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_7.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_8.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_9.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_10.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_11.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_12.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_13.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_14.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_15.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_16.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_17.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_18.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_19.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_20.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_High_01.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_High_02.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_Low_01.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_Low_02.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_Mid_01.edi, USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_Mid_02.edi 19890504 19890504 ground condition Complete Not planned -121.83769 -121.83769 37.04964 37.04964 USGS Thesaurus geophysics electromagnetic surveying faulting (geologic) magnetotelluric surveying ISO 19115 Topic Category geoscientificInformation None Electrical Data Interchange EDI San Andreas Fault System Searchable Product Depository SPUD legacy data magnetotelluric sounding Types OGC WMS Service Map Service OGC WFS Layer OGC WMS Layer USGS Metadata Identifier USGS:607f5d15d34e8564d680a48c Geographic Names Information System (GNIS) California Monterey County Loma Prieta San Andreas Fault Fresno County None. Please see 'Distribution Info' for details. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. U.S. Geological Survey Brian D Rodriguez Research Geophysicist Mailing

Mail Stop 973, W 6th Ave and Kipling St

Denver CO 80225-0046 USA 303-236-1361 brod@usgs.gov The Science Analytics and Synthesis (SAS) team is USGS Community for Data Integration (CDI) funded and operated out of the Fort Collins Science Center and Great Lakes Science Center. Windows 10 OS used for all preservation work Python 3.6 with Jupyter Notebook IDE used for software development Martyn Unsworth Gary Egbert John Booker 19990110 publication Journal of Geophysical Research: Solid Earth vol. 104, issue B1 n/a Wiley-Blackwell ppg. 1131-1150 https://dx.doi.org/10.1029/98JB01755 Kyle D. Enns Ricardo McClees-Funinan Anthony L. Everette Tara M. Bell Brian D. Rodriguez Michaela R. Johnson A. Shafer Powell 2020 application/service https://doi.org/10.5066/F71Z43P9 Upon acquisition, researchers ensured all binary and ASCII files were successfully transferred. For each file format there were both time series and cross power data for the 10 survey sites. In order to ensure the data could open in a text editor, 10% of files from each site were opened in Notepad. During this review process, the data reviewer conducted quality checks, which consisted of comparing original field-data plots with post-transfer data plots. No formal logical accuracy tests were conducted. 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. Accuracy of site locations are considered estimates as the coordinates were obtained from a scanned copy of the San Jose and Monterey, California 1:100,000 maps where the station locations were hand annotated during data collection, and from map sketches and notes on field logs (see PDF file found in the Child item station folders), and from operator memory using modern digital topographic software (DeLorme Xmap 7; see Modern digital topographic software used below) along with the 1:100,000 maps and field logs to pinpoint the station location. Modern digital topographic software used: DeLorme Xmap 7.0.0 Professional, build 15: 581.318897 running on Windows 7 Professional Service Pack 1, 32-bit operating system. 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 - https://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 (USGS National Elevation Dataset). Dean B. Gesch Michael J. Oimoen Gayla A. Evans 2014 publication n/a US Geological Survey https://dx.doi.org/10.3133/ofr20141008 Digital and/or Hardcopy 2014 publication date USGS National Elevation Dataset USGS Open-File Report DATA COLLECTION: Multiple high, mid, and low frequency time series (.TS and .S file extension) were each recorded with a USGS-built MT data acquisition instrument employing orthogonal horizontal USGS-built induction magnetic coils and Tinker & Rasor copper-copper sulfate porous pot electrodes. The original USGS MT truck system code, Magnetotelluric_Original-Code_Truck-to-Binary.txt (see Binary Data ScienceBase page at https://doi.org/10.5066/F7ZK5FW3 for more details) HP Workstation BASIC-based, recording software used is MTR02B, version 2.1 (June 6, 1986). The collected time series were stored on a portable field-rugged HP Workstation computer and then converted to intermediate spectra cross power files using fast Fourier transform (FFT) techniques and least-squares, cross-spectral analysis to solve for a tensor transfer function. True remote reference stations were not used, although local remote reference sensors were employed and every attempt was made to avoid manmade noise sources or were assumed to be minimal at the site. The time series and spectra cross power files were downloaded from the portable computer to 3.5" floppy disks during data collection. The time series files and the cross power files are only known to be readable by the original USGS HP-BASIC Workstation software. 1989 DATA CONVERSION: Converted original cross power file to spectra EDI file using Python code developed by the SAS team. (This code converts ASCII time series and cross power files to EDI format. The conversion code and supplemental resources are available on the code repository located here: https://doi.org/10.5066/F71Z43P9. The EDI files can be used in magnetotelluric modelling software. 20201007 DATA RECONCILIATION: Combine multiple frequency band cross power EDI files into a single cross power EDI file (EDI file extension) using EMI's MTR95, version 2.5.2, software that spans all frequencies sampled during data collection. The GGGSC team used an older commercial software package called GeotoolsMT to view the MT plots from the combined cross power EDI files to compare against the original MT field plots to verify that the conversion code worked correctly. Another commercial interpretation software the team also knows to import EDI files is called WinGLink. 20201008 Break up all data by station for release to science base. Give appropriate extensions to individual files. 20210211 Make Adobe Acrobat PDF log files Section 508 Compliant. 20210419 Point Entity point 1 0.0001 0.0001 Decimal degrees North American Datum 1927 (NAD27) Clarke 1866 6378206.4 294.9798 National Geodetic Vertical Datum of 1929 (NGVD 29) 1.0 Meter Attribute values Loma_Prieta_1989_Data_Quality_site-06.csv Comma Separated Variable (CSV) file containing MT station quality control information used to extract the appropriate the time-series data used in creation the EDI files. Producer Defined TS_Binary_File The string value name of the original binary time-series (TS) data file saved for preservation. For high band time-series data, n/a means time-series filename does not apply since software used during data collection did not store the individual time-series data files. U.S. Geological Survey time-series binary file name TS_Ascii_File Created ASCII time-series file name converted from original binary file. This time-series ASCII file is then converted to the time-series EDI format file for input into data processing software. For high band time-series data, n/a means time-series filename does not apply since software used during data collection did not store the individual time-series data files. U.S. Geological Survey time-series ASCII file name TS_Rating The string value time-series data quality rating. U.S. Geological Survey 1 excellent quality U.S. Geological Survey 2 good quality U.S. Geological Survey 3 moderate quality U.S. Geological Survey 4 poor quality U.S. Geological Survey 5 run aborted U.S. Geological Survey unknown quality value not known U.S. Geological Survey TS_Good_From The starting time in decimal seconds of useable time-series data for data processing purposes. For high, mid, or low band data, n/a means coherencies were less than the good data threshold of 0.75 for the corresponding high, mid, or low band shortest time periods. U.S. Geological Survey 0.171 0.171 seconds TS_Good_To The ending time in decimal seconds of useable time-series data for data processing purposes. For high, mid, or low band data, n/a means coherencies were less than the good data threshold of 0.75 for the corresponding high, mid, or low band longest time periods. U.S. Geological Survey 0.00234 0.00234 seconds TS_Run_# An integer value indicating the time-series data collection run number. For high band time-series data, n/a means time-series run number does not apply since software used in the field did not store the individual time-series data files. U.S. Geological Survey 1.0 8.0 none Comments time-series or cross-power comments U.S. Geological Survey Time-series or cross-power frequency band run (high, mid, or low) name. High band data for this survey includes frequencies from 2.44165041504 to 237.816750425 hertz. Mid band data includes frequencies from 0.0468750750001 to 3.42188047501 hertz. Low band data includes frequencies from 0.0023437498125 to 0.171093736313 hertz. CP_Binary_File The string value name of the original binary cross-power (CP) data file saved for preservation. U.S. Geological Survey Cross-power binary file name CP_Ascii_File Created ASCII cross-power file name converted from original binary file. This cross-power ASCII file is then converted to the spectra EDI format file for input into modeling software. U.S. Geological Survey Created ASCII cross-power file name CP_Rating The string value cross-power data quality rating. U.S. Geological Survey 1 excellent quality U.S. Geological Survey 2 good quality U.S. Geological Survey 3 moderate quality U.S. Geological Survey 4 poor quality U.S. Geological Survey 5 run aborted U.S. Geological Survey unknown quality value not known U.S. Geological Survey CP_Good_From The starting time in decimal seconds of useable cross-power data for data processing purposes. For high, mid, or low band data, n/a means coherencies were less than the good data threshold of 0.75 for the corresponding high, mid, or low band shortest time periods. U.S. Geological Survey 0.0469 6.35 seconds CP_Good_To The ending time in decimal seconds of useable cross-power data for data processing purposes. For high, mid, or low band data, n/a means coherencies were less than the good data threshold of 0.75 for the corresponding high, mid, or low band longest time periods. U.S. Geological Survey 0.00234 87.9 seconds CP_Run_# An integer value indicating the cross-power data collection run number. U.S. Geological Survey 1.0 3.0 none Note Notation column reserved for when an original time-series or cross-power file was not rescued from original field data disk. If Note column is blank, it means the corresponding original time-series or cross-power file was rescued from original field data disk. U.S. Geological Survey Comments written as a string of text USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_Mid_02.edi, ASCII text formatted EDI file for the Cross-Power Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_Mid_01.edi, ASCII text formatted EDI file for the Cross-Power Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_Low_02.edi, ASCII text formatted EDI file for the Cross-Power Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_Low_01.edi, ASCII text formatted EDI file for the Cross-Power Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_High_02.edi, ASCII text formatted EDI file for the Cross-Power Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP_High_01.edi, ASCII text formatted EDI file for the Cross-Power Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-CP.edi, ASCII text formatted EDI file for the Cross-Power Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_20.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_19.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_18.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_17.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_16.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_15.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_14.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_13.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_12.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_11.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_10.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_9.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_8.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_7.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_6.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_5.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_4.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_3.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_2.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Mid_1.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Low_2.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c USA-California-San_Andreas_Fault-Loma_Prieta-1989-MT06-TS_Low_1.edi, ASCII text formatted EDI file for the Time-Series Data. EDI is a common modern format for magnetotelluric modelling, created using Python-based software developed by the SAS team. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0L6_2cp.txt, ASCII text file (converted from original binary) containing cross-power data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0L6_2cp.bin, binary file of cross-power data (original data file) used to create EDI file after its conversion from binary to ASCII and saved as a cross-power text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0L6_22ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0L6_22ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0L6_21ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0L6_21ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0L6_1cp.txt, ASCII text file (converted from original binary) containing cross-power data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0L6_1cp.bin, binary file of cross-power data (original data file) used to create EDI file after its conversion from binary to ASCII and saved as a cross-power text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_9ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_9ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_8ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_8ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_7ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_7ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_6ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_6ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_5ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_5ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_4ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_4ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_3ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_3ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_2ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_2ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_2cp.txt, ASCII text file (converted from original binary) containing cross-power data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_2cp.bin, binary file of cross-power data (original data file) used to create EDI file after its conversion from binary to ASCII and saved as a cross-power text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_20ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_20ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_1ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_1ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_1cp.txt, ASCII text file (converted from original binary) containing cross-power data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_1cp.bin, binary file of cross-power data (original data file) used to create EDI file after its conversion from binary to ASCII and saved as a cross-power text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_19ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_19ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_18ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_18ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_17ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_17ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_16ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_16ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_15ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_15ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_14ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_14ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_13ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_13ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_12ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_12ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_11ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_11ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_10ts.txt, ASCII text file (converted from original binary) containing time-series data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ0D6_10ts.bin, binary file of time-series data (original data file) used to create time-series EDI file after its conversion from binary to ASCII and saved as a time-series text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ006_2cp.txt, ASCII text file (converted from original binary) containing cross-power data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ006_2cp.bin, binary file of cross-power data (original data file) used to create EDI file after its conversion from binary to ASCII and saved as a cross-power text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ006_1cp.txt, ASCII text file (converted from original binary) containing cross-power data used to create the EDI file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c SJ006_1cp.bin, binary file of cross-power data (original data file) used to create EDI file after its conversion from binary to ASCII and saved as a cross-power text file. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c mt06.png, Portable Network Graphic (PNG) raster plot of the phase angle and apparent resistivity for the station. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c Loma_Prieta_1989_site-06_Config.jpg, Scanned image file of the field configuration sheet for this MT station. These information are also captured in the header information of the corresponding edi files except for handwritten notes on weather and handdrawn maps of local site access. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c Loma_Prieta_1989_site-06_Log.jpg, Scanned image file of the field log sheet for this MT station. These information are also captured in the header information of the corresponding edi files except for handwritten notes on data collection operational problems and fixes. https://www.sciencebase.gov/catalog/item/607f5d15d34e8564d680a48c 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 USGS ScienceBase Catalog Number:607f5d15d34e8564d680a48c 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 for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P9DIJHDK none 20220802 Philip Brown U.S. Geological Survey Geophysicist Mailing

Mail Stop 973, W 6th Ave and Kipling St

Denver CO 80225-0046 USA 303-236-1310 pbrown@usgs.gov Brown, P.J., http://orcid.org/0000-0002-2415-7462 Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998