The Study of Interseismic Ground Deformation near Strike-slip Faults
Date Issued
2006
Date
2006
Author(s)
Chang, Tseng-Ti
DOI
zh-TW
Abstract
Taiwan is located in the circum-pacific seismic zone, which is a typical convergence plate. Due to the convergence mechanism, there are many folds and faults in Taiwan. The discontinous nature of faults allows them to be trated as large cracks in brittle material. Thus, linear elastic fracture mechanics can be applied to evaluate the stresses and the associated ground surface displacement resulting from fault movement. This research simulated the ground surface deformation before the strike-slip faults propagated via physical model and verified by the numerical analysis.
The material of physical model in this research is jelly, which property is linear elastic and able to accept the large deformation. It accorded with the purpose of simulating the deforamtion before cracks propagated. Moreover, to better understand this deformation process, we monitor the displacement field in scaled tectonic model experiments using high-resolution optical image correlation techniques ( stereoscopic particle imaging velocimetry, SPIV ) .After the processing of Stero PIV, it generated the vertical ground surface displacement near crack. In the numerical model, we adopted the finite element method (ABAQUS) to verify the results of physical model.
In this research, we considered three mode of strike-slip faults that influence the ground deformation near faults, such as fault mode, blind fault mode and multiple faults mode. In the fault mode, we considered the influence of dip angle; In the blind fault mode, we consider the depth of overburden; In the multiple faults mode, we considered the geometry of two cracks.
Subjects
平移斷層
物理模型
數值模擬
震間變形
立體視覺質點影像速度儀
Strike-slip faults
Physical model
Numerical analysis
Interseismic deformation
Stereoscopic particle image velocimetry
Type
thesis
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