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The document discusses seismicity in the Tibetan Plateau region resulting from the collision between the Indian and Eurasian tectonic plates. It describes how approximately half the plate convergence occurs along locked faults in the Himalayas, while the rest is accommodated by extension in the Tibetan Plateau as the thickened crust spreads under its own weight. Large earthquakes reflect movement on the Himalayan frontal thrust faults, while normal faulting earthquakes in the plateau and strike-slip quakes further north result from the eastward extrusion of crustal material. Seismicity data indicate a weak and hot lower-middle crust in the northern plateau, with earthquakes generally occurring above 30km depth, in contrast to sh