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摘要
Based on the Yoshimitsu Okada and Steketee' s dislocation model and present achievements of scientific researches on Wenchuan earthquake, we theoretically compute the distribution of deformation (strain) fields from the focal depth to ground surface in the region near the Longmenshan faults belt. Through the vector synthesis and coordinate transformation method, we expand Okada's single static dislocation model to the research of Longmenshan faults belt, specially the deformation fields caused by the slide motion of middle and north part of central segment and middle part of foreland segment of Longmenshan fault belt in Wenchuan earthquake. The research shows the spatial distribution features of level and vertical components of deformation fields. Through the simulation, we find that the vertical component of strain field is greater in magnitude but smaller in scope at the focus than that on the ground surface, the strain component along the strike direction increases gradually in both magnitude and influencing scope from focal depth to ground surface, and the variation of strain component perpendicular to the fault strike is similar to that of the vertical component. The large deformation near the focus perhaps stems from the plasticity. Moreover, our simulation also shows the variation of strain field with the distance to the fault outcrop. The simulation result on the ground surface agrees with the present scientific research. At last, by comparing with InSAR observation data, the deformation direction obtained by simulation agrees with the observation data.
- 出版日期2011-7
- 单位中国地震局
