 SCIGN
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Southern California
Integrated GPS Network
SCIGN is an array of
Global Positioning System (GPS) stations distributed throughout
southern California with emphasis on the greater Los Angeles metropolitan
region. The major objectives of the SCIGN array are: to provide
regional coverage for estimating earthquake potential throughout
Southern California, to identify active blind thrust faults and
test models of compressional tectonics in the Los Angeles region,
to measure local variations in strain rate that might reveal the
mechanical properties of earthquake faults In the event of an earthquake,
to measure permanent crustal deformation not detectable by seismographs,
as well as the response of major faults to the regional change in
strain.
The USGS Pasadena office participates in the SCIGN project. The
group's operational role includes data acquisition and the operation
and maintenance of stations. Our group also has primary responsibility
for providing earthquake information from the SCIGN array in the
event of a large earthquake.
Crustal Motion Map
SCIGN data support ongoing enhancements to current and future versions
of a data product called the SCEC Crustal Motion Map. This is presented
in the tables and figures of this report, represents an ongoing
effort by the Tectonic Geodesy Disciplinary Committee of the Southern
California Earthquake Center (SCEC) to produce a unified horizontal
velocity field that shows the contemporary interseismic deformation
across southern California.
Hector Mine earthquake
high resolution imaging
High resolution topography along the October 16, 1999 Hector Mine
earthquake (Mw7.1) surface ruptures using Airborne Laser Swath Mapping.
In order to document the surface rupture associated with the Hector
Mine earthquake, in particular the maximum slip area and the deformed
surface of Lavic Lake, we acquired a high-resolution data set using
relatively new topographic mapping methods. A raster laser scan
of the main surface breaks along the entire rupture zone, as well
as along an unruptured portion of the Bullion fault, was performed.
The image of the ground surface produced by this method is extraordinarily
detailed, comparable to that obtained when geologists make particularly
detailed site maps for geomorphic or paleoseismological studies.
Plate Boundary
Observatory Initiative (Alternate
Website)
The Western North America Plate Boundary Observatory (PBO) is a
proposed facility for investigating active tectonic and magmatic
processes of the Pacific/Juan de Fuca - North American plate boundary
through measurements of crustal deformation. The study of plate
boundary deformation is a research area that deserves increased
attention from a broad spectrum of Earth scientists.
EarthScope Initiative
EarthScope is designed to expand the observational capabilities
of the Earth Sciences and bring real-time data to our desktops.
Integrated with new and existing geologic information, these data
will provide unprecedented opportunities to unravel the structure,
evolution, and dynamics of the North American continent, and to
better understand earthquakes and fault systems, volcanoes and magmatic
processes, and links between tectonics and surfical processes.
SCIGN Talks, Publications & Related
Information:
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