Static deformation of a uniform half-space due to a long dip-slip fault
Static deformation of a uniform half-space due to a long dip-slip fault
复制标题
长倾角滑断层引起的均匀半空间静态变形
DOI：
10.1111/j.1365-246x.1992.tb00108.x
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发表时间：
1992
影响因子：
2.8
通讯作者：
Sarva Jit Singh
中科院分区：
文献类型：
--
作者：
S. Rani;Sarva Jit Singh
摘要本文对由倾斜滑移线源引起的均质、各向同性、完全弹性半空间任意点的位移和应力的封闭表达式进行了积分，得到了有限宽长倾斜滑移断层引起的弹性残余场。结果是有效的任意倾角的故障和介质内的任意接收器的位置。通过数值模拟，研究了位移场和应力场随距断层距离的变化规律。获得了一条长倾滑断层周围的应力场等值线图。由于断层作用而发生的永久性地表变形可以通过地震前后进行的大地测量来测量。利用这些观测值，可以利用文中给出的理论表达式反演断层参数（倾角、滑动、宽度、深度）。诊断震源性质的观测数据的特征是：数据的不对称性;各种变形分量的大小;以及这些分量随距离的下降率。这种不对称性主要取决于断层的倾角、滑动的大小和断层深度的下降速率。
SUMMARY Closed-form expressions for the displacements and stresses at an arbitrary point of a homogeneous, isotropic, perfectly elastic half-space caused by a dip-slip line source obtained earlier are integrated analytically to derive the elastic residual field due to a long dip-slip fault of finite width. The results are valid for an arbitrary dip of the fault and for arbitrary receiver locations inside the medium. The variation of the displacement and stress field with the distance from the fault is studied numerically. Contour maps showing the stress field around a long dip-slip fault are obtained. Permanent surface deformations which occur as a result of faulting can be measured from geodetic surveys carried out before and after an earthquake. These observations can be used to obtain the fault parameters (dip, slip, width, depth) by inversion, using the theoretical expressions given in the paper. The features of the observational data which are diagnostic of the source properties are: the asymmetry of the data; the magnitude of various components of deformation; and the rate of fall of these components with distance. The asymmetry depends mainly on the dip, the magnitude on the slip and the rate of fall on the depth of the fault.