Description: The USGS Earthquake Hazards, Quaternary Fault and Fold Database of the United States, was symbolized to match the California Geological Survey - 2010 Fault Activity Map of California(http://www.consrv.ca.gov/cgs/cgs_history/Pages/2010_faultmap.aspx)
The map shows the locations of most known faults that can be portrayed at 1:750,000 scale and indicates the latest age when displacements took place, according to available data. The displacements may have been associated with earthquakes or may have been the result of gradual creep along the fault surface. Faults exhibiting creep or triggered creep are identified on the map with appropriate symbols. The faults are color-coded and designated into one of four categories: historic (red), Holocene (orange), late Quaternary (green), undivided Quaternary (purple).
Copyright Text: USGS Earthquake Hazards Program (http://earthquake.usgs.gov/) and California Department of Conservation (http://www.conservation.ca.gov/cgs/rghm/ap/Pages/Index.aspx)
Unique Value Renderer: Field 1: AGE Field 2: null Field 3: null Field Delimiter: , Default Symbol:
N/A
Default Label: null UniqueValueInfos:
Value: <150 Label: Displacement in the last 200 years Description: Fault along which historic (last 200 years) displacement has occurred and is associated with one or more
of the following:
(a) a recorded earthquake with surface rupture. (Also included are some well-defined surface breakscaused by ground shaking during earthquakes, e.g. extensive ground breakage, not on the White Wolf
fault, caused by the Arvin-Tehachapi earthquake of 1952). The date of the associated earthquake is
indicated. Where repeated surface ruptures on the same fault have occurred, only the date of the latest
movement may be indicated, especially if earlier reports are not well documented as to location of ground
breaks.
(b) fault creep slippage - slow ground displacement usually without accompanying earthquakes.
Description: The USGS Earthquake Hazards, Quaternary Fault and Fold Database of the United States, was symbolized to match the California Geological Survey - 2010 Fault Activity Map of California(http://www.consrv.ca.gov/cgs/cgs_history/Pages/2010_faultmap.aspx)
The map shows the locations of most known faults that can be portrayed at 1:750,000 scale and indicates the latest age when displacements took place, according to available data. The displacements may have been associated with earthquakes or may have been the result of gradual creep along the fault surface. Faults exhibiting creep or triggered creep are identified on the map with appropriate symbols. The faults are color-coded and designated into one of four categories: historic (red), Holocene (orange), late Quaternary (green), undivided Quaternary (purple).
Copyright Text: USGS Earthquake Hazards Program (http://earthquake.usgs.gov/) and California Department of Conservation (http://www.conservation.ca.gov/cgs/rghm/ap/Pages/Index.aspx)
Unique Value Renderer: Field 1: AGE Field 2: null Field 3: null Field Delimiter: ; Default Symbol:
N/A
Default Label: null UniqueValueInfos:
Value: <15,000 Label: Displacement in the last 11,700 years Description: Holocene fault displacement (during past 11,700 years) without historic record. Geomorphic evidence for
Holocene faulting includes sag ponds, scarps showing little erosion, or the following features in Holocene
age deposits: offset stream courses, linear scarps, shutter ridges, and triangular faceted spurs. Recency
of faulting offshore is based on the interpreted age of the youngest strata displaced by faulting. Symbol:
Description: The USGS Earthquake Hazards, Quaternary Fault and Fold Database of the United States, was symbolized to match the California Geological Survey - 2010 Fault Activity Map of California(http://www.consrv.ca.gov/cgs/cgs_history/Pages/2010_faultmap.aspx)
The map shows the locations of most known faults that can be portrayed at 1:750,000 scale and indicates the latest age when displacements took place, according to available data. The displacements may have been associated with earthquakes or may have been the result of gradual creep along the fault surface. Faults exhibiting creep or triggered creep are identified on the map with appropriate symbols. The faults are color-coded and designated into one of four categories: historic (red), Holocene (orange), late Quaternary (green), undivided Quaternary (purple).
Copyright Text: USGS Earthquake Hazards Program (http://earthquake.usgs.gov/) and California Department of Conservation (http://www.conservation.ca.gov/cgs/rghm/ap/Pages/Index.aspx)
Unique Value Renderer: Field 1: AGE Field 2: null Field 3: null Field Delimiter: ; Default Symbol:
N/A
Default Label: null UniqueValueInfos:
Value: <130,000 Label: Displacement in the last 700,000 years Description: Late Quaternary fault displacement (during past 700,000 years). Geomorphic evidence similar to that
described for Holocene faults except features are less distinct. Faulting may be younger, but lack of
younger overlying deposits precludes more accurate age classification. Symbol:
Description: The USGS Earthquake Hazards, Quaternary Fault and Fold Database of the United States, was symbolized to match the California Geological Survey - 2010 Fault Activity Map of California(http://www.consrv.ca.gov/cgs/cgs_history/Pages/2010_faultmap.aspx)
The map shows the locations of most known faults that can be portrayed at 1:750,000 scale and indicates the latest age when displacements took place, according to available data. The displacements may have been associated with earthquakes or may have been the result of gradual creep along the fault surface. Faults exhibiting creep or triggered creep are identified on the map with appropriate symbols. The faults are color-coded and designated into one of four categories: historic (red), Holocene (orange), late Quaternary (green), undivided Quaternary (purple).
Copyright Text: USGS Earthquake Hazards Program (http://earthquake.usgs.gov/) and California Department of Conservation (http://www.conservation.ca.gov/cgs/rghm/ap/Pages/Index.aspx)
Unique Value Renderer: Field 1: AGE Field 2: null Field 3: null Field Delimiter: ; Default Symbol:
N/A
Default Label: null UniqueValueInfos:
Value: <1,600,000 Label: Dispalcement undifferentiated Description: Quaternary fault (age undifferentiated). Most faults of this category show evidence of displacement sometime
during the past 1.6 million years; possible exceptions are faults which displace rocks of undifferentiated
Plio-Pleistocene age. Unnumbered Quaternary faults were based on Fault Map of California, 1975.
See Bulletin 201, Appendix D for source data. Symbol:
Name: Earthquake Fault Zone of Required Investigation
Display Field: FAULT_ZONE
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: The Alquist-Priolo Earthquake Fault Zoning Act was passed in 1972 to mitigate the hazard of surface faulting to structures for human occupancy. This state law was a direct result of the 1971 San Fernando Earthquake, which was associated with extensive surface fault ruptures that damaged numerous homes, commercial buildings, and other structures. Surface rupture is the most easily avoided seismic hazard.
Copyright Text: California Department of Conservation (http://www.conservation.ca.gov/cgs/rghm/ap/Pages/Index.aspx)
Label: Within Zone Description: Region within which a fault investigation must be conducted as a condition for a permit to construct certain buildings pursuant to California Public Resources Code section 2621 et seq.
Name: Earthquake Fault Zone of Required Investigation
Display Field: FAULT_ZONE
Type: Feature Layer
Geometry Type: esriGeometryPolygon
Description: The Alquist-Priolo Earthquake Fault Zoning Act was passed in 1972 to mitigate the hazard of surface faulting to structures for human occupancy. This state law was a direct result of the 1971 San Fernando Earthquake, which was associated with extensive surface fault ruptures that damaged numerous homes, commercial buildings, and other structures. Surface rupture is the most easily avoided seismic hazard.
Copyright Text: California Department of Conservation (http://www.conservation.ca.gov/cgs/rghm/ap/Pages/Index.aspx)
Label: Within Zone (out of scale range) Description: Region within which a fault investigation must be conducted as a condition for a permit to construct certain buildings pursuant to California Public Resources Code section 2621 et seq.