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Parameter Tree:
EARTH SCIENCE SERVICES > ENVIRONMENTAL ADVISORIES > GEOLOGICAL ADVISORIES > LANDSLIDES
Definition:
A general term covering a wide variety of mass-movement landforms and processes
involving the downslope transport, under gravitational influence, of soil and
rock material en masse. Usually the displaced material move over a relatively
confined zone or surface of shear. The wide range of sites and structures, and
of material properties affecting resistance to shear, result in a great range
of landslide morephology, rates, patterns of movement, and scale. Landsliding
is usually preceded, accompanied, and followed by imperceptible creep along the
surface of sliding and/or within the slide mass. Terminology designating
landslide types generally refers to the landform as well as the process
responsible for it, e.g. rockfall, translational slide, block glide, avalanche,
mudflow, liquefaction slide and slump.


A Landslide Advisory may be included in other types of advisories such as ones
for earthquakes, volcanic activity, and floods. Landslide advisories may also
take the form of landslide susceptibility and probability maps.
Reference:
Jackson, Julia A. (1997) Glossary of Geology, 4th Edition. Alexandria,
VA: American Geological Institute, 769 p.


See http://www-socal.wr.usgs.gov/north/landslide.html as an example.

For contributing factors to landslides,see
http://landslides.usgs.gov/html_files/nlic/page5.html.

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