Determination and implications of the rock physical parameter in the Maergaichaka fault, Tibet, China, using remote sensing data

Synthetic aperture radar interferometry was used to study the Maergaichaka fault where Manyi earthquake occured on Nov. 8, 1997 in Tibet, China. With a more appropriate base line, we present the coseismic interferometric fringe. With the prior knowledge of strike-slip movements, the decomposition of the displacement vector in the direction of the fault strike indicates that the horizontal displacement amount to 5.03 meters near the epicenter of the Manyi earthquake, which is more consistent with the field observation (4.5 meters) than the previous work (Peltzer et al., 1999; Shan Xinjian et al., 2002). We also modeled the rock physical parameter using Okada elastic model of half space, which was characterized by a high Poisson ratio. The high Poisson ratio of the upper crust indicate the structural back grounding that it is more possible that the interior crustal shortening play an more important role in the development of Tibet plateau than the doubling the continental crust by replacement of the Tibetan upper mantle by underthrust of Indian continental crust