{ED2E6A58-CA92-4907-8DF4-4319BB72E0D9}2003082707454200FALSE20040126103714002004012610371400Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 8.3.0.800enThe Alquist-Priolo Earthquake Fault Zoning Act addresses the hazard of surface fault rupture, which occurs when the movement on a fault deep within the earth breaks through to the surface. Not all earthquakes result in surface rupture. The earthquake must be large enough (generally greater than magnitude 5) in order to reach the surface. By definition, blind thrust faults that cause earthquakes, such as the Northridge Earthquake of 1994, do not break the ground surface and thus are not shown on Alquist-Priolo maps. The Act was passed in 1972 -- a direct result of the 1971 San Fernando Earthquake, which caused extensive surface fault rupture that damaged numerous homes, commercial buildings, and other structures. Surface fault rupture -- generally the most easily avoided seismic hazard -- causes about five percent of the damage resulting from earthquakes. Ground shaking and related effects such as liquefaction and landslides account for 95 percent of the damage. Each Alquist-Priolo map covers about 60 square miles, but the actual zones generally are about 1,000 feet wide. Before development can take place in those zones, the developer must perform a geologic investigation. Typically, a developer hires a state-licensed geologist to determine whether the project area is underlain by active faults (those that have caused ground displacement in the last 11,000 years). The developer submits the geologic report to the local planning department, which must agree with the report’s findings before the development can proceed. Structures for human occupancy generally are set back 50 feet from active faults. There have been 27 earthquakes associated with surface faulting in California since the first Alquist-Priolo maps were issued, most recently the magnitude 7.1 Hector Mine quake last October. The last six of those occurred mainly within established A-P zones. Seven of those 27 quakes had surface displacement of greater than a foot. The main benefits are accessibility, cost and ease of storage," Department of Conservation Director Darryl Young said of the digitized maps. "A paper copy generally costs up to $7 per map. In this format, all of the maps for Northern and Eastern or Central California are available on one CD for $30, and users can print out whatever portion they need. You can move from county to county and map to map by clicking an arrow. It's as user-friendly as possible." In addition to studying and mapping earthquakes and other geologic phenomena, the Department of Conservation maps and classifies areas containing mineral deposits; ensures the reclamation of land used for mining; promotes beverage container recycling; regulates oil, gas and geothermal wells; and administers agricultural and open-space land conservation programsCalifornia Department of Conservation2001fault.txthttp://www.consrv.ca.gov/CGS/geologic_hazards/regulatory_hazard_zones/ap_cd_htm.htmpublication date2001CompleteAs needed-120.375304-117.62309335.87522034.732426EarthquakeFaultFault ZonesHazardsMEAR315CaliforniaCopyright protectedCopyright protectedText FileCarol Dahmen Mark Oldfield Don DrysdaleCALIFORNIA DEPARTMENT OF CONSERVATION mailing and physical address

801 K Street, MS 12-31

SacramentoCA95814 USA(916) 323-1886(916) 445-3334shmp@consrv.ca.gov CALIFORNIA DEPARTMENT OF CONSERVATION Microsoft Windows 2000 Version 5.1 (Build 2600) Service Pack 1; ESRI ArcCatalog 8.3.0.800fault.txtenFGDC Content Standards for Digital Geospatial MetadataFGDC-STD-001-1998local timeCarol Dahmen Mark Oldfield Don Drysdale CALIFORNIA DEPARTMENT OF CONSERVATION mailing and physical addressSacramento CA95814

801 K Street, MS 12-31

USA (916) 323-1886(916) 445-3334shmp@consrv.ca.gov 20040126http://www.esri.com/metadata/esriprof80.htmlESRI Metadata ProfileISO 19115 Geographic Information - MetadataDIS_ESRI1.0datasetDownloadable Datahttp://www.consrv.ca.gov/CGS/geologic_hazards/regulatory_hazard_zones/ap_cd_htm.htm002Text File20040126