Abstract We investigate a fault model for the shallow, strong (Mw6.6) tsunamigenic earthquake of 20 July 2017 with source area in the east Aegean Sea between Bodrum peninsula (Turkey) and Kos Isl. (Greece). Fault plane solutions are consistent with the regional active tectonics indicating normal faulting striking about E–W. A relocated hypocenter of the main shock was obtained and the rupture time-space history for two alternative fault solutions dipping either to the south or to north was approached by inverting P-waves recorded at teleseismic (30°–90°) distances. In both fault solutions the seismic moment calculated corresponds to magnitude Mw = 6.6 while the earthquake had total rupture duration of less than 10 s. The maximum co-seismic slip was close to the hypocenter ∼1.6 m and ∼2.2 m for the south and north dipping faults, respectively. Close to the surface co-seismic slip of ∼0.3 m was calculated. Our analysis of Sentinel satellite InSAR images showed ground deformation fringes indicating ∼13 cm vertical displacement change between the North and South coasts of the Karaada islet. This result is in line with our preference of the south dipping fault, supported primarily by GPS displacements, regional tectonics, aftershock activity and tsunami observations, although results of InSAR inversion fit equally well both solutions.

中文翻译：

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2017 年 7 月 20 日东爱琴海博德鲁姆-科斯海啸地震（Mw6.6）的断层模型

摘要 我们研究了 2017 年 7 月 20 日发生在爱琴海东部博德鲁姆半岛（土耳其）和科斯群岛之间的浅层强（Mw6.6）海啸地震的断层模型。（希腊）。断层面解与区域活动构造一致，表明正常断层发生在东西向。获得了主震的重新定位的震源，并通过在远震（30°–90°）距离记录的反相 P 波来接近两个备选断层解的破裂时空历史，该解向南或向北倾斜。在两个断层解中，计算出的地震矩对应于震级 Mw = 6.6，而地震的总破裂持续时间小于 10 秒。对于南倾断层和北倾断层，最大同震滑动分别靠近震源~1.6 m 和~2.2 m。计算出接近地表的同震滑移约 0.3 m。我们对 Sentinel 卫星 InSAR 图像的分析显示，地面变形条纹表明卡拉达岛南北海岸之间的垂直位移变化约为 13 厘米。这一结果符合我们对南倾断层的偏好，主要由 GPS 位移、区域构造、余震活动和海啸观测支持，尽管 InSAR 反演的结果同样适合这两种解决方案。