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Fault Slip Distribution of the 1999 Mw7.1 Hector Mine, California, Earthquake, Estimated from Satellite Radar and GPS Measurements
 

Summary: Fault Slip Distribution of the 1999 Mw7.1 Hector Mine, California,
Earthquake, Estimated from Satellite Radar and GPS Measurements
Bulletin of the Seismological Society of America, Vol. 92, No. 4, pp. 1377-1389, May 2002
by Sigurj´on J´onsson,1 Howard Zebker, Paul Segall, and Falk Amelung
Abstract We use a combination of satellite radar and GPS data to estimate the slip
distribution of the 1999 Mw7.1 Hector Mine Earthquake, a right-lateral strike-slip earth-
quake that occurred on a northwest-southeast striking fault in the southern California
Mojave Desert. The data include synthetic aperture radar interferograms (InSAR) from
both ascending and descending orbits, radar amplitude image offset fields (SARIO) for
both ascending and descending azimuth directions, and campaign GPS observations from
55 stations provided by Agnew et al. (2002). We model the fault with nine segments
derived from the field-mapped fault rupture, the SARIO data, and aftershock locations.
We first estimate the dip of each fault segment, as well as a single constant strike-slip
component across each segment, resulting in an average dip of 83 to the northeast and
slip of up to 5.6 m. Then, we fix the optimal fault segment dip, discretize the fault seg-
ments into 1.5 km × 1.5 km patches, and solve for the variable slip distribution using a
nonnegative least-squares method that includes an appropriate degree of smoothing. Our
preferred solution has both right-lateral strike slip and reverse faulting. The estimated
geodetic moment is 5.93×1019 Nm (Mw7.1), similar to seismological estimates, indicating
that there are insignificant interseismic and postseismic deformation signals in the data.

  

Source: Amelung, Falk - Rosenstiel School of Marine and Atmospheric Sciences, University of Miami

 

Collections: Geosciences