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首页> 外文期刊>Earth, planets and space: EPS >A normal-faulting seismic sequence triggered by the 2011 off the Pacific coast of Tohoku Earthquake: Wholesale stress regime changes in the upper plate
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A normal-faulting seismic sequence triggered by the 2011 off the Pacific coast of Tohoku Earthquake: Wholesale stress regime changes in the upper plate

机译：2011年东北太平洋太平洋沿岸触发的正断层地震序列：上板块的整体应力状态变化

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摘要

We here show relocated hypocenters within a seismic sequence with normal faults in the northern part of Ibaraki Prefecture, triggered after the M 9.0 2011 off the Pacific coast of Tohoku Earthquake. Depth-sections of the hypocenters from the center of the northern Ibaraki region to the north show an earthquake alignment dipping westwards at 40° to 50° at depths shallower than 10 km. On the other hand, hypocenters from the center to the south show a cross-cutting geometry consisting of conjugate westward- and eastward-dipping planes at the same depths. The dip angles of the hypocenter alignments are roughly consistent with the nodal planes of focal mechanisms of large normal earthquakes, and exhibit optimal-orientations in terms of the frictional failure criterion. Furthermore, comparison of the focal mechanisms recorded before and after the 2011 Tohoku Earthquake suggests that the stress field abruptly changed from horizontal compression to extension in the study area. The most plausible explanation of the drastic stress changes is a significant reduction in trench-normal compressive stress compared with reduction in trench-parallel stress accompanying large horizontal extensional deformation within the overlying plate.
机译：我们在这里显示了在茨城县北部具有正常断层的地震序列中重新定位的震源，该震源是在东北太平洋太平洋地震2011年9.0级之后触发的。从茨城北部地区的中心到北部的震源的深度剖面显示，地震线向西倾斜40°至50°，深度小于10 km。另一方面，从中心到南方的震源显示出横切的几何形状，该几何形状由在相同深度的共轭向西和向东倾斜平面组成。震源准线的倾角与大地震的震源机制的节面大致相符，并且根据摩擦破坏准则表现出最佳的方位。此外，对2011年东北地震前后记录的震源机制进行比较，结果表明研究区域的应力场从水平压缩突然扩展为延伸。关于急剧应力变化的最合理的解释是，与伴随上覆板大的水平延伸变形而引起的平行沟槽应力的减小相比，沟槽法向压缩应力的显着减小。

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