Dynamics Research on Strong Shock Gestation in Sichuan-Yunnan and Its Adjacent Regions

Abstract eng:
To know the dynamic environment of seismogenic progress, we try to get the underground medium information by studying the physical characteristics of the lithosphere and upper mantle, such as the regional P-wave velocity structure, spatial distribution of S-wave attenuation, spatial distribution of Qc value of coda wave. And we try to get the underground dynamics information by studying the regional stress field which is partitioned in horizontal orientation and detached at vertical direction, as the crustal S-wave splitting, the seismic mechanism of middle and large earthquakes, the strain field of GPS, the anisotropy of Pn-wave, the upper mantle SKS splitting, and so on. Then, with the dynamic models, the coupling extent of different spheres has been analyzed. The results show, the most important dynamic environment of seismogenic progress in Sichuan-Yunnan and its adjacent regions is the lithosphere asymmetry at the structure, physical characteristics, dynamical operation, and so on, especially the flow trait of lower crust and the drag force of upper mantle acting on the crust.

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