Kinematic fault slip evolution source models of the 2008 M7.9 Wenchuan earthquake in China from SAR interferometry, GPS and teleseismic analysis and implications for Longmen Shan tectonics

摘要: The M_w 7.9 2008 Wenchuan earthquake ruptured about 280 km of faults in the Longmen Shan Sichuan province, China, at eastern edge Tibetan Plateau. We use teleseismic waveforms with geodetic data from Global Positioning System, synthetic aperture radar interferometry and image amplitude correlation to produce a source model this earthquake. describes evolution fault slip during constrains spatial distribution seismic constrain mostly time slip. find that started largely thrust motion on an imbricate system beneath central Shan, including Beichuan Fault Pengguan Fault, depth extending up 50 km northwest mountain front. ruptures continued northeast along more oblique (right-lateral thrust) proportion lateral increasing northern Shan. northernmost segment has much steeper dip, consistent nearly pure strike-slip motion. kinematic shows rupture propagated 2.5–3.0 km s^(−1), producing cascade subevents total duration 110 s. complex caused shortening uplift extremely steep which supports models where plateau is formed by thrusting over strong crust Basin.