CO-SEISMIC DISPLACEMENT OF 24-MARCH-2011 M_W=6.8 MONG HPAYAK (TAR LAY) EARTHQUAKE, MYANMAR

摘要

The 2011 M_W=6.8 Mong Hpayak earthquake occurredon the western segment of the Nam Ma fault, one ofmany left-lateral faults in the borderregion of Myanmar,Laos and Thailand. SAR images are probably the onlyavailable geodetic data for studying the co-seismicmotion of this earthquake. Two-pass DInSARprocessing of both ascending and descending ALOSPALSAR images reveals surface displacement patternof nearly pure strike-slip fault. These InSAR results aremodelled as elastic repsonse to slip on a planar fault andthen downsampled for the inversion to solve for faultparameters. The co-seismic displacements predicted bythe resulted fault model agrees well with InSARobservations. We then calculate the distribution ofCoulomb stress change in nearby active faults and it isrevealed that sections of nearby faults in northernThailand have increasing stress. This information wouldhelp re-evaluate the likelihood of future earthquake inthis fault zone.