Maureen A.L. Walton Antoinette G. Papesh Samuel Y. Johnson James E. Conrad Daniel S. Brothers 20200430 polyline shapefile, kml data release DOI:10.5066/P91RYEZ4 Pacific Coastal and Marine Science Center, Santa Cruz, CA U.S. Geological Survey https://doi.org/10.5066/P91RYEZ4 https://www.sciencebase.gov/catalog/file/get/5d38b842e4b01d82ce8b9b56 A comprehensive map of Quaternary faults has been generated for offshore of California. The Quaternary fault map includes mapped geometries and attribute information for offshore fault systems located in California State and Federal waters. The polyline shapefile has been compiled from previously published mapping where relatively dense, high-resolution marine geophysical data exist. The data are also available in kml format and are accompanied by a pdf containing citations for the compiled source data. In the last decade, a number of new marine geophysical datasets collected by the U.S. Geological Survey (USGS), the Ocean Exploration Trust, and other organizations has led to substantially improved high-resolution mapping of the seafloor in areas including California's mainland State waters and the southern California continental borderland. Data include comprehensive multibeam bathymetry, seismic-reflection, and marine magnetic data in numerous offshore areas. Most of these data have been processed, merged, and released by the USGS in maps, data releases, and journal publications in support of the California Seafloor Mapping Program and the U.S. West Coast and Alaska Marine Geohazards Project. Improved data coverage has allowed researchers to better map offshore faults in areas previously unmapped or covered only by low-resolution data. Additionally, subsurface imaging and seafloor sampling has led to better understanding of fault kinematics and recency of deformation, which are critical for accurately assessing California's seismic and coastal hazards. The geographic information systems (GIS) shapefile presented here contains offshore fault geometries, locations, ages, slip rates, and relevant published reference information (please refer to the rest of the metadata for detailed attribute information and references). This compilation represents a significant update to previous national and regional fault datasets, which have been developed without the benefit of new high-resolution datasets. The geodatabase has been designed for easy ingestion by partners including the California Geological Survey and the USGS Quaternary Fault and Fold Database, and to be used to improve seismic hazards products, especially the USGS National Seismic Hazard Maps, the Uniform California Earthquake Rupture Forecast, and the Southern California Earthquake Center Community Fault Model. Other stakeholders include academic scientists, consultants, community planners and managers, the risk assessment community, and the general public. Additional information about the field activities from which these interpreted data were derived is available in the data sources. See the table of attributes included in the data for specific fault source information, and the associated PDF for a comprehensive list of sources used to compile this dataset. Any use of trade, product, or firm names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although this Federal Geographic Data Committee-compliant metadata file is intended to document the dataset in nonproprietary form, as well as in Esri format, this metadata file may include some Esri-specific terminology. 1982 2020 Published years of the compiled data. See PDF for comprehensive list of sources used to compile this dataset. Planned As needed -124.444403 -117.117080 40.276898 32.335489 USGS Metadata Identifier USGS:5d38b842e4b01d82ce8b9b56 ISO 19115 Topic Category geoscientificInformation oceans Data Categories for Marine Planning Distributions USGS Thesaurus scientific interpretation geospatial datasets earth characteristics sea-floor characteristics marine geophysics marine geology earthquakes hazards geologic processes oceanic lithosphere Marine Realms Information Bank (MRIB) keywords natural agents of coastal change geology geophysics geological features hazards and disasters earthquake effects earthquake prediction seismic methods geologic mapping oceanographic observations None U.S. Geological Survey USGS Coastal and Marine Hazards and Resources Program CMHRP Pacific Coastal and Marine Science Center PCMSC Geographic Names Information System (GNIS) United States of America State of California Pacific Ocean None USGS-authored or produced data and information are in the public domain from the U.S. Government and are freely redistributable with proper metadata and source attribution. Please recognize and acknowledge the U.S. Geological Survey as the originator(s) of the dataset and in products derived from these data. U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov https://www.sciencebase.gov/catalog/file/get/5d38b842e4b01d82ce8b9b56?name=qFaults_offshore_california_2020_map.png&allowOpen=true Map of qFaults Offshore 2020 coverage PNG California Geological Survey (CGS) Mac Pro, Late 2013, with macOS High Sierra, version 10.13.6 running Parallels Virtual Machine; ESRI ArcGIS 10.6; qFaults_Offshore_California_2019, dataset is 1.40 MB. This data and associated attributes have been compiled from a variety of publications. See the 'FLT_SOURCE' attribute within the shapefile, and the accompanying references PDF for details on where to find specific attribute accuracy information. No formal logical accuracy tests were conducted. Some pre-Quaternary fault geometries were included to reflect new research updating these faults from Quaternary to pre-Quaternary. This data and associated attributes have been compiled from a variety of publications. See the 'FLT_SOURCE' attribute within the shapefile, and the accompanying references PDF for details on where to find specific horizontal position accuracy information. Antoinette Papesh 2020 PDF online U.S. Geological Survey https://www.sciencebase.gov/catalog/file/get/5d38b842e4b01d82ce8b9b56?name=qFaults_offshore_california_2020_references.pdf Digital Resource 20200401 This accompanying reference PDF is as current as the shapefile. REF qFaults_offshore_california_2020_references.pdf is a comprehensive list of referenced sources for this fault dataset. Faults geometries offshore of central California were retrieved from publications listed in the accompanying references PDF (qFaults_offshore_california_2020_references.pdf). Faults offshore of central California were digitized in UTM 10, and then projected to WGS 1984 when incorporated into this dataset. See the 'FLT_SOURCE' attribute within the shapefile, and the accompanying references PDF for details on where to find information on specific sources used. 20200322 Antoinette Papesh U.S. Geological Survey Contractor mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7532 apapesh@usgs.gov Faults geometries located in the Continental Borderland offshore southern California were retrieved from the California Seafloor Mapping Program data series 781 (Golden, compiler, 2013), from publications listed in the accompanying references PDF. Faults offshore of southern California were digitized in UTM 11, and then projected to WGS 1984 when incorporated into this dataset. See the 'FLT_SOURCE' attribute within the shapefile, and the accompanying references PDF for details on where to find information on specific sources used. 20200322 Antoinette Papesh U.S. Geological Survey Contractor mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7532 apapesh@usgs.gov A KML file of the fault dataset was created using GIS software. See the 'FLT_SOURCE' attribute within the shapefile, and the accompanying references PDF for details on where to find information on specific sources used. 20200325 Antoinette Papesh U.S. Geological Survey Contractor mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-460-7532 apapesh@usgs.gov Edited metadata to add keywords section with USGS persistent identifier as theme keyword. No data were changed. 20201019 U.S. Geological Survey VeeAnn A. Cross Marine Geologist Mailing and Physical

384 Woods Hole Road

Woods Hole MA 02543-1598 508-548-8700 x2251 508-457-2310 vatnipp@usgs.gov Vector string 1093 0.0001 0.0001 Decimal degrees D_WGS_1984 WGS_1984 6378137.0 298.257223563 qFaults_Offshore_California polylines representing mapped faults U.S. Geological Survey FID internal feature number Esri Sequential unique whole numbers that are automatically generated. Shape feature geometry Esri feature type FAULT_NAME Name of the fault strand as commonly reported in peer-reviewed publications. U.S. Geological Survey and California Geological Survey Entry appended with 'fault'. If there is no specific name for the fault strand, this entry is populated with the fault zone name; entry appended with 'fault zone'. If there is no specific fault zone name, this entry is populated with 'unspecified'. FAULT_ZONE Name of the fault zone as commonly reported in peer-reviewed publications. U.S. Geological Survey and California Geological Survey Entry appended with 'fault zone'. If there is no specific fault zone name, this entry is populated with 'unspecified'. SECTION_NA Name of the section of the fault strand. U.S. Geological Survey and California Geological Survey Sections can be differentiated based on slip rate changes, strike changes, or name changes; sections are not meant to represent rupture segments or barriers. If there is no specific section name of the fault strand, this entry is left blank. OTHER_NAME other names commonly used in the literature for the fault strand U.S. Geological Survey If other names have been used for the fault strand, these other names are reported in this field. If no other names have been reported, this entry is left blank. FAULT_ID U.S. Geological Survey defined numerical fault identifier U.S. Geological Survey Values are taken from U.S. Geological Survey Quaternary Fault and Fold Database reference ID attribute where the fault zone matches. FLT_AGE age category of the fault U.S. Geological Survey and California Geological Survey HIS Historic. To be classified as 'historic', faults need to have strong and confident evidence of historic rupture on the fault. Strong and confident evidence includes evidence of rupture greater than magnitude 6, or surface rupture of an adjacent onshore strand. U.S. Geological Survey and California Geological Survey HOL Holocene or younger. Faults in this dataset less than 15 Ka are considered to be Holocene. U.S. Geological Survey and California Geological Survey LTQT Late Quaternary. Faults in this dataset greater than 15 Ka and less than 130 Ka are considered to be Late Quaternary. U.S. Geological Survey and California Geological Survey QT Quaternary. Use if age is known to be Quaternary but there are no other age constraints. U.S. Geological Survey and California Geological Survey PREQT pre-Quaternary. Use pre-Quaternary for faults that have been previously mapped as Quaternary, and new mapping shows them as pre-Quaternary. U.S. Geological Survey and California Geological Survey SLIP_RATE Categorization of net slip including horizontal and vertical components. Use the same slip rate for all strands of a fault zone unless a specific strand is superseded by a different slip rate value from the literature. If a slip rate spans multiple categories, use the category of the preferred value. Categories are used to account for uncertainty and variations in slip rates. Category values are in millimeters per year. California Geological Survey <0.2 Net slip is less than 0.2 millimeters per year. California Geological Survey 0.2-1.0 Net slip is between 0.2 and 1.0 millimeters per year. California Geological Survey 1-5 Net slip is between 1 and 5 millimeters per year. California Geological Survey >5 Net slip greater than 5 millimeters per year. California Geological Survey unspecified Unspecified slip rate. California Geological Survey SLIP_SENSE the sense of slip along the fault plane California Geological Survey Descriptors are D, S, R, N and unspecified for dextral, sinistral, reverse, normal, and unspecified, respectively. Two letters are included where the motion is oblique, with the dominant motion as the first letter. The same slip sense is used for all strands of a fault zone unless a specific strand is superseded by a different slip sense value from the literature. SHAPE_LENG length of fault strand Esri GIS calculated value of the length of the fault strand, reported in kilometers. MAPPED_SCA the scale of mapping or published map source U.S. Geological Survey Scale of published map source where available; if mapping was completed in GIS, least precise scale used for mapping is reported. LINE_TYPE the categorization of mapping accuracy based on data coverage and scale of mapping of the fault, can be used as a representation rule in the GIS file to indicate symbology U.S. Geological Survey and California Geological Survey Accurately Located defined where mapped scale is less than or equal to 1:50,000, see MAPPED_SCA attribute U.S. Geological Survey and California Geological Survey Approximately Located defined where mapped scale is greater than 1:50,000, see MAPPED_SCA attribute U.S. Geological Survey and California Geological Survey Inferred defined where data are sparse or faults are extrapolated U.S. Geological Survey and California Geological Survey unspecified data unspecified U.S. Geological Survey and California Geological Survey EXPRESSION brief description of constraining data U.S. Geological Survey brief description of constraining data types, approximate spacing, and resolution where applicable FLT_SOURCE citation information for fault strand geometry and attributes U.S. Geological Survey and California Geological Survey A list of citations of sources that were used to define fault geometry and attributes. See the accompanying references PDF (qFaults_offshore_california_ 2020_references.pdf) for a comprehensive list of references. Polyline shapefile and kml containing geometries and attributes of faults offshore of California. U.S. Geological Survey U.S. Geological Survey - ScienceBase Mailing and Physical

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 1-888-275-8747 sciencebase@usgs.gov These data are available in shapefile format (qFaults_Offshore_California_2019.shp and associated files) contained in a single zip file (qFaults_Offshore_California_2019.zip), along with CSDGM FGDC-compliant metadata, and a thumbnail map of the faults contained in the dataset, and a list of sourced references. 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 on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Shapefile ArcGIS 10.6 Esri polyline shapefile Zip file contains the interpreted polyline shapefile and the associated files. Winzip, 7-zip, or Winrar are free software that will open .zip files. 0.21 https://www.sciencebase.gov/catalog/file/get/5d38b842e4b01d82ce8b9b56?facet=qFaults_offshore_california_2020 https://doi.org/10.5066/P91RYEZ4 Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the zipped shapefile. The second link points to a landing page with shapefile and kml data, metadata, PDF of sourced references, and a thumbnail map of faults. KML ArcGIS 10.6 kml kml version of fault shapefile none 1.53 https://www.sciencebase.gov/catalog/file/get/5d38b842e4b01d82ce8b9b56?name=qFaults_offshore_california_2020.kml https://doi.org/10.5066/P91RYEZ4 Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the kml file. The second link points to a landing page with shapefile and kml data, metadata, PDF of sourced references, and a thumbnail map of faults. To download the data, it's recommended that you go to the website and take advantage of the large file handler. Portable Document Format n/a PDF PDF file containing citations for all sourced references none 0.037 https://www.sciencebase.gov/catalog/file/get/5d38b842e4b01d82ce8b9b56?name=qFaults_offshore_california_2020_references.pdf https://doi.org/10.5066/P91RYEZ4 Data can be downloaded using the Network_Resource_Name links. The first link is a direct link to download the PDF of sourced references. The second link points to a landing page with shapefile and kml data, metadata, PDF of sourced references, and a thumbnail map of faults. None. These data can be viewed with GIS software. 20201019 U.S. Geological Survey, Pacific Coastal and Marine Science Center PCMSC Science Data Coordinator mailing and physical

2885 Mission Street

Santa Cruz CA 95060 831-427-4747 pcmsc_data@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998