Seismogenic faulting of the sedimentary sequence and laterally variable material properties in the Zagros Mountains (Iran) revealed by the August 2014 Murmuri (E. Dehloran) earthquake sequence
Seismogenic faulting of the sedimentary sequence and laterally variable material properties in the Zagros Mountains (Iran) revealed by the August 2014 Murmuri (E. Dehloran) earthquake sequence
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DOI：
10.1093/gji/ggv365
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发表时间：
2015-11
影响因子：
2.8
通讯作者：
A. Copley;E. Karasözen;Behnam Oveisi-;J. Elliott;S. Samsonov;E. Nissen
中科院分区：
文献类型：
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作者：
A. Copley;E. Karasözen;Behnam Oveisi-;J. Elliott;S. Samsonov;E. Nissen
我们提出了2014年8月伊朗扎格罗斯山脉Murmuri（Dehloran）地震序列的震源模型。一次Mw6.2主震之后是一个包含5次Mw5.4以上地震的余震序列。P和SH波形模型表明，所有事件都有占主导地位的逆冲断层机制，并有质心深度，将它们放置在厚的沉积序列，结晶基底之上。结合我们估计的震源机制，相对搬迁的事件震源和地面位移模式观察到使用干涉合成孔径雷达意味着主震和最大的余震破裂不同的断层面，都有助于地表变形。断层面都在水平拉长补丁滑动，可能是由于流变分层限制了破裂的上倾和下倾范围。Murmuri主震的滑动矢量意味着洛雷斯坦弧下的滑脱比Dezful Embayment下的任何此类特征都要弱，这为扎格罗斯山脉山脉前缘的平面弯曲度提供了解释。
We present source models for the August 2014 Murmuri (Dehloran) earthquake sequence in the Zagros Mountains of Iran. An Mw6.2 mainshock was followed by an aftershock sequence containing five events of Mw ≥ 5.4. Models of P and SH waveforms show that all events had dominantly thrust-faulting mechanisms, and had centroid depths that place them within the thick sedimentary sequence, above the crystalline basement. The combination of our estimated focal mechanisms, relative relocations of the event hypocentres and the surface displacement patterns observed using InSAR imply that the mainshock and largest aftershock ruptured different fault planes and both contributed to the surface deformation. The fault planes both slipped in horizontally elongated patches, possibly due to rheological layering limiting the updip and downdip extent of rupture. The slip vector of the Murmuri mainshock implies that the decollement beneath the Lorestan Arc is weaker than any such feature beneath the Dezful Embayment, providing an explanation for the plan-view sinuosity of the range-front of the Zagros Mountains.