COMPLETE SET OF NEW DIGITAL REGIONAL GEOLOGIC MAPS AND MAP DATABASES FOR SAN FRANCISCO BAY REGION, CALIFORNIA

US Geological Survey geologists, in cooperation with colleagues at California Geological Survey and William Lettis and Associates, will publish in 2005 the final map in a complete set of new regional (scale 1:50,000 to 1:100,000) geologic maps of the nine county San Francisco Bay area, plus Santa Cruz County and parts of other surrounding counties. Each geologic map in the set also includes digital map database (GIS) files, some of which include additional detailed data not possible to display at regional scale. This set of geologic maps includes bedrock and Quaternary surficial deposits maps, and builds on a previous set of regional maps published in the 1970s and 80s with with much new fieldwork, a revised regional tectonostratigraphic framework, compilation of much recent mapping, and construction of the digital map databases. These maps and map databases form a basic data set for new landslide and earthquake hazards studies, palinspastic reconstruction of San Andreas Fault system offsets, 3-D geologic and seismic velocity mapping, basin hydrogeology, and preparation of a Quaternary fault map database for the San Francisco Bay region. All of the maps and databases are available on-line (http://sfgeo.wr.usgs.gov, http://consrv.ca.gov/cgs), and most are available for print on demand (http://rockyweb.cr.usgs.gov/mod/index.html). We are now working on bringing all of the component maps, along with recently completed high resolution mapping, together into a unified geologic map and map database.