Possible Costs Associated with Investigating and Mitigating Some Geologic Hazards in Rural Parts of San Mateo County, California

Hazard maps were derived by integrating slope data and previous geologic, landslide and debris flow mapping. The digital database, which is found at &geopubs.wr.usgs.gov/open-file/of00-127& includes 43 plotfiles for slope maps, Digital Orthophoto Quadrangle maps, Digital Raster Graphic topographic base maps, geologic maps, deep-seated landslide inventory maps, deep-seated landslide susceptibility maps, and debris flow inventory and susceptibility maps.

Twelve ARC export files of supporting digital data are included in the database, and other data have been published previously and are available at other USGS websites named in an accompanying pamphlet (of00-127_2. ps, of00-127_2.pdf, of00-127_2.txt). As explained in the pamphlet, a geohazard website included in the publication facilitates interactive use of the hazard information in this database. All data layers are in Universal Transverse Mercator (UTM) projection, zone 10.

The scale of the source maps limits the spatial resolution (scale) of the database to 1:24,000. An explanatory pamphlet (of00-127_2.ps, of00-127_2.pdf, of00-127_2.txt) accompanies the digital database. An interactive website for landslide hazards landslides.usgs.gov/ is provided for the study area.

People can use the website to locate their property, overlay deep-seated landslide hazard maps and determine the possible costs associated with investigating them. Information is provided for investigating and mitigating several other kinds of geologic hazards, but the data are not interactive.