PRELIMINARY RESULTS OF POST-SEISMIC DISPLACEMENT OF 2011 Mw 6.8 TARLAY EARTHQUAKE, MYANMAR USING TIME-SERIES INSAR TECHNIQUES

摘要

The co-seismic motion of Mw = 6.8 Tarlay earthquake of March 24 th, 2011 in Myanmar can be detected by InSAR over the upper-northern part of Thailand. Of especially interest is Mae Chan fault in Chiang Rai province which is located approximately 50 kilometers from the epicenter. A previous study using 2-pass DInSAR with ALOS-PALSAR images for both ascending and descending orbits, reveals rupture of more than 20 kilometers with approximately 1.2 meters offset in left-lateral sense and the re-distribution of stress may promote failure on certain segments of Mae Chan fault. This study aims to monitoring the characteristics of post-seismic deformation of Tarlay earthquake with also attention on stress change on Mae Chan fault. The study area is covered with dense vegetation and accessing to the study area is very difficult, so InSAR time-series technique is an attractive technique to measure surface deformation. Radarsat-2 data acquired from June 2011 to May 2012 have been processed by PSInSAR and Small Baseline techniques. The initial results with mean LOS deformations reveal the potential of Radarsat-2 data to estimate the surface deformation which occurred around Mae Chan fault. Further study will be performed on longer time-series Radarsat-2 data and modeling of post-seismic motion.