Distinct element analysis of overburden subjected to reverse oblique-slip fault
Distinct element analysis of overburden subjected to reverse oblique-slip fault
复制标题
逆斜滑断层覆盖层的离散元分析
DOI：
10.1016/j.jsg.2017.01.007
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发表时间：
2017
影响因子：
3.1
通讯作者：
Hisashi Taniyama
中科院分区：
文献类型：
--
作者：
小野寺周;笠原康平;松崎裕;鈴木基行;Hisashi Taniyama
利用离散单元法研究了逆冲滑动断层作用下的上覆岩层变形，并与1995年兵库县南部地震时野岛断层的剪切变形进行了比较。剪切变形主要发生在狭窄区域的覆盖层下盘侧，由逆断层分量引起。由于逆断层和走滑运动的应力导致的破坏面的发展与凸起的形状在横截面上和一个雁列模式在平面上。在本分析中获得的高增量应变区的宽度与观察到的剪切宽度一致;然而，观察到的剪切和模拟的剪切间隔和方向并不一致。模拟结果表明，在变形的早期阶段，在深部形成的短剪切合并形成更长的剪切，因为它们向表面传播。
The deformation of overburden subjected to a reverse oblique-slip fault was examined in this study using the distinct element method, and the results were compared with the shears measured at the Nojima fault during the 1995 Hyogoken Nanbu earthquake. Shear deformation was found to occur mainly on the footwall side of the overburden in a narrow zone and to be caused by the reverse fault component. The stress due to both the reverse fault and strike-slip movement led to the development of failure surfaces with a convex-upward shape in cross section and an en echelon pattern in plan view. The width of the zones of high incremental strain obtained in the present analysis was found to be in agreement with the observed width of the shears; however, the observed and simulated intervals and orientations of the shears did not agree. The simulation results suggest that short shears that form in the deep part in the early stages of the deformation join to form longer shears as they propagate toward the surface.