|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.|
|HOL||Holocene or younger. Faults in this dataset less than 15 Ka are considered to be Holocene.|
|LTQT||Late Quaternary. Faults in this dataset greater than 15 Ka and less than 130 Ka are considered to be Late Quaternary.|
|QT||Quaternary. Use if age is known to be Quaternary but there are no other age constraints.|
|PREQT||pre-Quaternary. Use pre-Quaternary for faults that have been previously mapped as Quaternary, and new mapping shows them as pre-Quaternary.|
|<0.2||Net slip is less than 0.2 millimeters per year.|
|0.2-1.0||Net slip is between 0.2 and 1.0 millimeters per year.|
|1-5||Net slip is between 1 and 5 millimeters per year.|
|>5||Net slip greater than 5 millimeters per year.|
|unspecified||Unspecified slip rate.|
|Accurately Located||defined where mapped scale is less than or equal to 1:50,000, see MAPPED_SCA attribute|
|Approximately Located||defined where mapped scale is greater than 1:50,000, see MAPPED_SCA attribute|
|Inferred||defined where data are sparse or faults are extrapolated|
California Geological Survey (CGS)
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.
Are there legal restrictions on access or use of the data?
Use_Constraints: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.
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.
|Data format:||Zip file contains the interpreted polyline shapefile and the associated files. in format Shapefile (version ArcGIS 10.6) Esri polyline shapefile Size: 0.21|
|Data format:||kml version of fault shapefile in format KML (version ArcGIS 10.6) kml Size: 1.53|
|Data format:||PDF file containing citations for all sourced references in format Portable Document Format (version n/a) PDF Size: 0.037|
These data can be viewed with GIS software.