The complexity of the Tibetan lithospheric deformation is evident from extensive seismicity and diversefocal mechanism solutions.Here we investigate the focal depths and fault plane solutions of moderateearthquakes in the Tibetan region by teleseismic waveform modeling and a multi-scale double-differenceearthquake relocation method.Shallow earthquakes are widespread across the whole study region. In the central Tibet, earthquakes arerestricted to the upper crust and originate dominantly by strike-slip faulting, in agreement with low velocitylayers and strong Sn attenuation zones observed previously in the lower crust. In the northern and southernTibet, where the Asian and Indian plate subduct beneath the central Tibet, earthquakes appear to be distributedthroughout the thickness of the crust and exhibit dominantly reverse faulting (Bai et al., 2015a).
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