Abstract On February 21, 2007, a moderate-sized (Mw 5.7) earthquake struck the town of Sivrice (Elazig, Turkey) located within the East Anatolian Fault (EAF) zone that forms the boundary between the Arabian and Anatolian plates. The earthquake source parameters of the mainshock reported by different agencies are significantly different. In the mean time, the relation of this earthquake to the EAF has not been fully explored. In this study, we combine remotely sensed Synthetic Aperture Radar data obtained from ENVISAT ASAR images (European Space Agency) with relocated seismicity to map the observed surface displacement field, resolve the earthquake source parameters and determine the fault plane geometry. We calculated coseismic interferograms from both ascending and descending orbits and modeled them by elastic dislocations on rectangular fault surfaces using a downhill simplex simulated annealing algorithm. InSAR analysis and seismicity distribution reveal that the earthquake took place on the Adiyaman fault (AF), a major southern splay of the EAF. The ruptured part of the AF has a listric geometry with an oblique normal slip (rake − 73 ± 21 ° ), and a strike of N42 ° E. The computed coseismic slip is 64 ± 18 cm with a moment magnitude of Mw 5.9. The resolved fault plane has a steep dip (greater than 80 ° ) near the surface and mildly dipping at depths between 3.6 and 8.5 km (dip 63 ± 4 ° ). The kinematics of the faulting is supported by the observed transtensional left-lateral strike-slip regime in the region of tectonic depression of Hazar Lake.

中文翻译：

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通过 Mw 5.7 2007 Sivrice 地震重新激活 Adıyaman 断层（土耳其）：InSAR 观测到的阿拉伯-安纳托利亚板块边界内的斜列正断层

摘要 2007 年 2 月 21 日，一场中等规模（Mw 5.7）地震袭击了位于东安纳托利亚断层（EAF）带内的 Sivrice（土耳其埃拉泽）镇，该带形成了阿拉伯和安纳托利亚板块之间的边界。不同机构报告的主震震源参数有明显差异。同时，这次地震与EAF的关系还没有得到充分的探讨。在这项研究中，我们将从 ENVISAT ASAR 图像（欧洲航天局）获得的遥感合成孔径雷达数据与重新定位的地震活动相结合，以绘制观测到的地表位移场，解析震源参数并确定断层面的几何形状。我们计算了上升和下降轨道的同震干涉图，并使用下坡单纯形模拟退火算法通过矩形断层表面上的弹性位错对其进行建模。InSAR 分析和地震活动分布表明，地震发生在阿德亚曼断层（AF）上，这是 EAF 南部的一个主要分支。AF 的破裂部分具有倾斜的法向滑动（前角 - 73 ± 21 ° ）和 N42 ° E 的走向。计算出的同震滑动为 64 ± 18 cm，力矩为 Mw 5.9。已解析的断层平面在地表附近有一个陡峭的倾角（大于 80°），在 3.6 至 8.5 公里的深度（倾角 63±4°）有轻微的倾角。