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The California Geological Survey (CGS)
has developed the Landslide Inventory
Map Series to provide additional
information to geotechnical
professionals, local government
personnel, as well as property owners
and developers who use
Seismic Hazard Zone Maps.
Earthquake-induced landslide zones of
required investigation include
inventories of known landslides, but
previously these inventories were only
available as small-scale plates in
seismic hazard zone reports.
Landslide
inventory maps show locations and
characteristics of landslides that have
moved in the past but generally do not
indicate the mechanism(s) that triggered
them. The geologic, terrain and
climatic conditions that led to past
slope failures often provide clues to
the locations and conditions of future
slope failures. Therefore, inventory maps provide
useful information about the potential
for future landsliding. In addition,
recognizing the type and recency of
landsliding can also facilitate the scope
and design of site-specific geotechnical
investigations and guide slope
remediation strategies.
Inventory maps are prepared primarily by
geomorphic analysis of aerial
photographs and secondarily by field
reconnaissance, interpretation of
topographic map contours and review of
previous mapping. Landslides shown on
the Landslide Inventory Map Series were
compiled at a scale of 1:24,000 on the
U.S. Geological Survey topographic map
and several key characteristics are
shown through cartographic symbology.
Each map in this series contains an
explanation of the map symbology as well
as a brief description of the geology
and landslide occurrences in the map
area.
These landslide inventory maps are the
first of many to be released in the San
Francisco Bay and Southern
California regions. This series
is a new addition to the list of
publications that CGS currently
distributes. If you would like to
purchase a printed Landslide
Inventory Map you may do so by
contacting CGS
Publications.
How to download maps
To download a Landslide Inventory Map
move your curser over a named quadrangle inside the
colored region of the map and click on
the quadrangle.
Alternatively, you can also download a
map using an alphabetized list that is located at the end of
the
page. All maps are in an Adobe
Acrobat (PDF) file and you will need
Adobe Acrobat Reader to view them.
Download Adobe Acrobat Reader.
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