Estimating Crustal Deformation with a Combination of GPS and InSAR Measurements
Reporter: Chiu Chi-Yu
Abstract
The widespread use of space geodesy technique has produced numerous, high-quality surface deformation data, and these geodetic data can provide importance constraints on fault geometry and slip distribution. For inverting source geometry more efficiently from deformation data, we have applied a Monte Carlo optimization technique (i.e. simulated annealing), that involves an element of randomness that permits them to escape local minima and ultimately converges to the global minimum of misfit space [Cervelli et al., 2001].
Jonsson [2002] use a combination of GPS and InSAR measurements to estimate the crustal deformation of the 1999 M w 7.1 Hector Mine Earthquake, a right-lateral strike-slip event occurred on a northwest-southeast trending fault, with up to 5 m observed surface offset in the southern California. The final optimal solution of fault parameters obtained by joint inversion of GPS and InSAR data includes: (1) average dip is 83 ° to northeast, (2) this event has both right-lateral strike-slip and reverse faulting, and (3) the maximum strike-slip and dip-slip are 6.0 and 1.6 m at a depth of 6 km on the northwestern branch of the Hector Mine rupture, just northwest of the epicenter [Jonsson et al., 2002].
References
P. Cervelli, M. H. Murray, P. Segall, Y. Aoki, and T. Kato, Estimating source parameters from deformation data, with an application to the March 1997 earthquake swarm off the Izu Peninsula, Japan, J. Geophys. Res. , 106 , 11217-11238, 2001
S. Jonsson, H. Zebker, P. Segall, and F. Amelung, Fault slip distribution of 1999 M w 7.1 Hector Mine earthquake, California, estimated from satellite radar and GPS measurements, Bull. Seism. Soc. Am. , 92 , 1377-1389, 2002
S. Jonsson, Modeling volcano and earthquake deformation from satellite radar interferometric observations, Ph.D. thesis, Stanford University, 2002