Coseismic Slip Distribution of the 24 January 2020 Mw 6.7 Doganyol Earthquake and in Relation to the Foreshock and Aftershock Activities
Coseismic Slip Distribution of the 24 January 2020 Mw 6.7 Doganyol Earthquake and in Relation to the Foreshock and Aftershock Activities
复制标题
2020年1月24日Mw 6.7 Doganyol地震的同震滑移分布及其与前震和余震活动的关系
DOI：
10.1785/0220200152
复制
发表时间：
2020-11
影响因子：
3.3
通讯作者：
Bai Qipeng
中科院分区：
文献类型：
--
作者：
Lin Xin;Hao Jinlai;Wang Dun;Chu Risheng;Zeng Xiangfang;Xie Jun;Zhang Baolong;Bai Qipeng
2020年1月24日（UTC），土耳其东部安纳托利亚断层以东发生破坏性的6.7级地震，造成多人伤亡和重大财产损失。本文用双折射宽频带体波和面波记录研究了这次地震的破裂过程。结果表明，本次地震为左旋走滑地震，破裂方向以南向为主。在14 km以上的浅层，主滑动斑沿走向分布沿着30 km，最大滑动量为1.2 m，总地震矩为1.69×1019 N·m。用我们的滑动模型预测的水平地表位移的东西分量范围从0.4m到-0.3m。预测的位移与卫星图像上的观测位移基本一致。我们重新定位了459次前震和早期余震，以探索前震和余震序列与同震滑动之间的关系。结果表明，早期余震的分布与同震滑动量之间存在显著的相关关系。主震可能已经充分释放了大滑移斑的应变能，因此，该滑移斑发生的早期余震较少。虽然我们注意到重新定位的前震和同震滑动之间的相似模式，以及前震的迁移，但由于不完整的重新定位前震目录，我们的数据集可能无法很好地解决相关性和迁移。基于滑动模型，计算了主震引起的周围断层上的库仑应力变化。结果表明，主震促进应力积累的北方和南端的Elazig-Matalya段，并可能重新激活锁定的断层段，导致在这些地区的高地震危险性。虽然这次地震并没有显著增加库仑应力变化，但马塔利亚-卡赫萨马拉斯-安塔基亚段的地震危险性应引起注意。
On 24 January 2020 (UTC), a destructive Mw 6.7 earthquake struck the east Anatolian fault of eastern Turkey after a series of foreshocks, causing many casualties and significant property damage. In this study, the rupture process of this earthquake is investigated with teleseismic broadband body-wave and surface-wave records. Results indicate that this earthquake is a left-lateral strike-slip event, and the rupture extends mainly to south. The main slip patch spreads ∼30 km along strike in the shallow above 14 km with a peak slip of ∼1.2 m, and the total seismic moment is 1.69×1019 N·m. The east–west component of horizontal surface displacement predicted with our slip model ranges from ∼0.4 to −0.3 m. The predicted displacements are consistent with the observed ones obtained from satellite images. We relocate 459 foreshocks and early aftershocks to explore the relationship between foreshock and aftershock sequences and coseismic slip. It is noted that there is an anticorrelation relationship between the distributions of early aftershocks and the coseismic slip. The strain energy in the large slip patch may have been sufficiently released by the mainshock; therefore, fewer early aftershocks occurred in that patch. Although we note a similar pattern between the relocated foreshock and coseismic slip, and a migration of foreshock, our dataset may not well resolve the correlation and migration due to the incomplete relocation foreshock catalog. Based on the slip model, we calculate the coulomb stress changes on the surrounding faults caused by the mainshock. The results reveal that the mainshock promoted stress accumulation on the northern and southern ends of the Elazig–Matalya segment and may reactivate the locked fault segment, leading to a high seismic risk in these regions. Although this earthquake does not significantly increase the coulomb stress change, the seismic risk of the Matalya–Kahraman Maras–Antakya segment should draw attention.