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Geology of the Lassen volcanic area
The
geology of the Lassen volcanic area
presents a record of sedimentation and volcanic activity in the area in and around
Lassen Volcanic National Park
in
Northern California
, U.S. The park is located in the southernmost part of the
Cascade Mountain Range
in the
Pacific Northwest
region of the United States. Pacific Oceanic
tectonic plates
have plunged below the
North American Plate
in this part of North America for hundreds of millions of years. Heat from these
subducting
plates has fed scores of
volcanoes
in
California
,
Oregon
,
Washington
and
British Columbia
over at least the past 30 million years (see
Geology of the Pacific Northwest
) and is also responsible for activities in the Lassen volcanic area.
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