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A three-dimensional temporary seismic transmission array was arranged in a 50×60 km2 region around Jiashi strong earthquake swarm to receive seismic waves generated by 8 fires from different azimuths. With the inversion method without model blocks and using P and S reflections from Moho at critical distances, the 3-D images of P, S velocity perturbation and ratio vp/vs perturbation of the upper...
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