Abstract

During the East Anatolian earthquake with M_w = 7.8, which occurred on February 6, 2023 at 1:17 UTC, the 361 km long segment of the NE-trending East Anatolian active left-lateral fault zone (EAFZ) was activated. A left-lateral displacement took place at a distance of 318 km on formed seismic ruptures. Its maximum magnitude of 8.5 m is registered northward of the earthquake epicenter. To the northeast, the displacement of several meters is maintained over a significant length of the activated segment and is accompanied by uplift of the south-eastern side of the ruptured zone at up to 1.5 m. To the southwest of the maximum displacement area, the strike slip decreases from it at shorter distances compared to the northeastern part and the vertical component varies, although the southeastern side is mostly uplifted. In the terminal southwest, the strike slip is replaced by normal faults, gaping fractures, and other manifestations of transverse extension, which are accompanied by landslides and are mainly secondary seismic dislocations. Left lateral slip also occurred at the northern ends of the western and eastern branches of the Dead Sea Transform (DST), adjacent to the EAFZ from the south. Despite the fact that the energy distribution of numerous aftershocks along the EAFZ is generally proportional to the distribution of offsets on seismic ruptures, the slip on the EAFZ occurred during and immediately after the main shock. In the northern part of the DST, a significant decrease in the amount of energy released by strong earthquakes during the last centuries has been established. We consider that the tectonic stress accumulated in the northern part of the DST became the important geodynamic source of the East Anatolian 02.06.2023 earthquake.

中文翻译：

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东安纳托利亚的构造方面 2023 年 2 月 6 日土耳其地震*

摘要

在世界标准时间 2023 年 2 月 6 日 1:17 发生的M _w = 7.8 东安纳托利亚地震期间，北东向活动左旋断裂带 (EAFZ) 长 361 公里的一段被激活。在形成的地震破裂处，在距离318公里处发生了左旋位移。其最大震级为 8.5 m，位于地震震中以北。在东北部，激活段的相当大长度上保持了数米的位移，并伴随着破裂带东南侧隆起高达 1.5 m。在最大位移区的西南部，与东北部相比，走滑距离较其东北部更短，且垂直分量有所不同，但东南侧大部分隆起。在西南末端，走滑被正断层、张开断裂等横向伸展表现所取代，并伴有滑坡，主要是次生地震错动。左侧向滑移也发生在死海转变（DST）西支和东支的北端，从南面毗邻东亚自由区。尽管沿 EAFZ 的多次余震的能量分布通常与地震破裂偏移量的分布成正比，但 EAFZ 上的滑动发生在主震期间和主震之后。在夏令时北部地区，过去几个世纪中强地震释放的能量显着减少。我们认为DST北部积累的构造应力成为2023年6月2日东安纳托利亚地震的重要地球动力源。