Constraints on the Geometry and Frictional Properties of the Main Himalayan Thrust Using Coseismic, Postseismic, and Interseismic Deformation in Nepal

摘要: The geometry and frictional properties of a fault system are key parameters required to understand its seismic behavior. Main Himalayan Thrust in Nepal is the type example continental megathrust forms part which accommodates significant fraction India‐Eurasia convergence. Despite extensive study this zone shortening, remains controversial. Here, we use interseismic, coseismic, postseismic geodetic data investigate proposed downdip geometries. We interseismic coseismic from previous studies, acquired before during 2015 urn:x-wiley:jgrb:media:jgrb53987:jgrb53987-math-0001 7.8 Gorkha earthquake. then supplement these by processing our own deformation data, following find that kinematic modeling alone cannot easily distinguish between previously therefore develop mechanical joint coseismic‐postseismic slip inversion simultaneously solves for distribution rate‐strengthening friction parameters. run using geometries they all capable explaining majority data. values rate parameter, urn:x-wiley:jgrb:media:jgrb53987:jgrb53987-math-0002, rate‐and‐state law 0.8 urn:x-wiley:jgrb:media:jgrb53987:jgrb53987-math-0003, depending on used. These agreement with results laboratory studies those inferred other earthquakes. suggest limitations earthquake cycle geodesy partly explain continued controversy over role various faults Himalaya.