USGS Landslide Information
On the Web
Northern California
El Niño
In light of the 1997-98 El Niño storms, the
U.S. Geological Survey (USGS), in conjunction with the California
Office of Emergency Services (OES) and the National Weather Service
(NWS), created a number of landslide hazard maps of the San Francisco
Bay Area, California. These maps can be viewed on-line. http://elnino.usgs.gov/elnino/landslides-sfbay/
Landslide Folio I
The San Francisco Bay Region Landslide Folio comprises
six separate but related reports keyed by letter to Open-file Report
97-745. These reports contain digital maps of topology, landslide
inventories, and rainfall thresholds, joined with information from
the OES and NWS. The data contained within these reports covers
the entire region, as well as by county. This information is useful
for response to possible slope failure within the San Francisco
Bay Area, California. http://wrgis.wr.usgs.gov/open-file/of97-745/
Landslide Folio II 
Along with the original file formats, Open-file Report
97-745 is now available in .PDF format. Therefore, it can be quickly
and easily downloaded and viewed with Adobe Acrobat® Reader.
For a complete listing of .PDFs, click on the link below.
http://sfslide.wr.usgs.gov/docs/wgmt/sfslide/folio.html
Landslide Inventory by County
Ever wanted to see what a geologist sees? Below is
a link to the online Digital Landslide Distribution Database. There
are landslide inventories for a number of regions within the San
Francisco Bay Area, California.
http://wrgis.wr.usgs.gov/wgmt/sfbay/ls-dist.html
What happened during the last
El Niño?
Heavy rainfall associated with a strong El Niño
caused over $150 million in landslide damage in the 10-county San
Francisco Bay region during the winter and spring of 1998. Scientists
from the USGS Landslide Hazards Program based in Reston, Virginia;
Golden, Colorado; and Menlo Park, California; and from the USGS
Geologic Mapping Program’s San Francisco Bay Mapping Team based
in Menlo Park, California, cooperated in the landslide-damage assessments.
These are their results.
http://greenwood.cr.usgs.gov/pub/mf-maps/mf-2325/
Other Landslide Information and Links
Additional sites contain links to online landslide
information. Below are a few links to sites dedicated to relaying
up-to-date information for those interested in landslide research,
policy and facts.
http://landslides.usgs.gov/index.html
http://landslides.cr.usgs.gov/html_files/nlicsun.html
http://sfslide.wr.usgs.gov/docs/wgmt/sfslide/link.html
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