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2008 UNAVCO Science Workshop
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Abstract Information
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Abstract Title Walker Lane Tectonic Deformation and Fault Slip Rates Constrained by GPS Data
Abstract Author William C. Hammond, Geoff Blewitt, Corné Kreemer, Hans-Peter Plag
Abstract Text In
the western Great Basin, the Walker Lane accommodates ~10 mm/yr of
relative motion across a 100-200 km wide zone between the Basin and
Range Province and the Sierra Nevada/Great Valley microplate. Inside
this zone, complex patterns of intracontinental crustal strain result
in the presence of numerous seismogenic faults that create earthquake
hazards for the nearby Reno/Carson/Tahoe and Las Vegas metropolitan
areas.
To precisely describe and quantify these motions, the
Nevada Geodetic Laboratory began in early 2004 to directly measure
these crustal motions by making semi-continuous and episodic GPS
measurements in the Walker Lane and southern Nevada. The Mobile Array
of GPS for Nevada Transtension (MAGNET) and the Nevada Earthquake
Response Network (NEARNET) have grown geographically to extend from
east of Las Vegas, Nevada, northward and westward through eastern
California, the Reno/Carson/Tahoe areas, into northeast California,
nearly to the Oregon border. These measurements complement the GPS
coverage of the Plate Boundary Observatory by providing a more
geographically complete network with 20 km average station spacing,
sampled with instrumentation similar to that used by PBO. The combined
scope and precision of the MAGNET/PBO measurements will provide an
unprecedented synoptic view of crustal deformation for this part of the
plate boundary, and allow for more precise geodetic estimation of fault
slip rates.
This GPS dataset has grown, and analytical
procedures have improved, to the point where we can now provide precise
deformation rates inside a subset of the network that lies in
west-central Nevada. We have integrated these data with those of the
more sparsely distributed continuous and USGS tripod-based campaign
data, to develop strain rate maps and block models to estimate slip
rates on faults. We will present recent developments of our network,
processing and interpretation paying particular attention to the status
of PBO stations within the study area, evaluating their performance and
data quality.
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