SEISMIC RESPONCE OF A SHALLOW BASIN FROM EARTHQUAKE ON A BLIND ACTIVE FAULT BENEATH

Tao Xiaxin; Sun Xiaodan; Liu Haimin; Li Ping

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SEISMIC RESPONCE OF A SHALLOW BASIN FROM EARTHQUAKE ON A BLIND ACTIVE FAULT BENEATH

Tao Xiaxin,Sun Xiaodan * #,Liu Haimin,Li Ping

Harbin Institute of Technology

*Correspondence author

#Submitted by

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Funding: none

Opened online:14 June 2007

Accepted by: none

Citation: Tao Xiaxin,Sun Xiaodan,Liu Haimin.SEISMIC RESPONCE OF A SHALLOW BASIN FROM EARTHQUAKE ON A BLIND ACTIVE FAULT BENEATH[OL]. [14 June 2007] http://en.paper.edu.cn/en_releasepaper/content/13470

Many cities in the world are located in basins. Basin can amplify ground motion significantly by the soft sediment, buried rock topography and edge effect in it. Hundreds of papers have been published on this effect for decades. Seismic waves are adopted as inputs in the analysis. Near field ground motion is governed predominantly by earthquake source. A hybrid source model is introduced in this paper, which combines Asperity model and K square model to take into account the physical nature and ignorance on the slip distribution on the faulting plane. The ground motion in short period range is synthesized by a random method in which dynamic corner frequency is applied in each sub-source model. The ground motion in the basin is further calculated by means of 1D equivalent linearization procedure. Two steps are carried out for the long period motion. Firstly, the displacement field at the top of buried crystal base rock surface is calculated by analytical Green Function method. Then the ground motion at ground surface is calculated by 3D wave propagation finite element method with input from the first step. The two parts of ground motion are finally superposed. For illustration, the result of a shallow basin from an earthquake with magnitude 6 on the blind fault beneath is shown and the distribution pattern of the response motion is summarized.

Keywords:stochastic model；numerical Green function;equivalent linearization;shallow basin

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