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The Simulation Seismogram
详细信息   
摘要
In this paper,we use non-linear dynamic Finite Element Method(FEM)to obtain a simulation seismogram.Here,the dynamic FEM is a time-related simulation.Thus,dynanic FEM is quite different from the traditional FEM,and also different from the pseudo-dynamic simulation that is a set of static simulations at a series of time.Contrastingly,dynamic FEM takes every element’s(node’s)acceleration and its inertia into consideration.On the basis of theoretical seismogram,we proposed the concept of the simulation seismogram.Using non-linear dynamic FEM we got the simulated seismogram of a FEM model.With inversion steps and by comparing the simulation seismogram and the real seismogram,we approached the physics of the earth media and the physics of the focus of an earthquake.As an example,taking the Yanshan fault zone,Taihangshan Mountain Front fault zone,and Tan-Lu fault zone into consideration for the modeling,we built the FEM model for the crust of the north and middle of China.In addition,the model takes the coastline into consideration and the bottom of the crust is set to be the non-reflection boundary,which is equal to an infinitely continued media.When running the model,we applied an explosive load on the element where geographically matches to Tangshan City.As the model was running,we got three time-courses of stress at the elements matching to Lanzhou,Xi’an,and Shanghai Station,respectively.These time courses of stress are the simulated seismograms.By practicing the inversion methodology,we adjusted the physical parameters of the model.Compared to the theoretical seismogram,the simulation seismogram is more close to the physical reality.

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