图尔基耶 2023 年 MW7.8 和 MW7.6 地震的共震变形和断层滑移分布

IF 1.2 4区 地球科学 Q3 Earth and Planetary Sciences
Weikang Li , Lijiang Zhao , Kai Tan , Xiaofei Lu , Caihong Zhang , Chengtao Li , Shuaishuai Han
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引用次数: 0

摘要

2023 年 2 月 6 日,土耳其中南部的帕扎尔奇克镇发生了瞬间震级为 7.8 级的破坏性地震,9 小时后,附近的埃尔比斯坦市又发生了瞬间震级为 7.6 级的强烈地震。为了研究此次地震造成的地表变形特征以及断层破裂的影响,本研究利用土耳其国家固定全球导航卫星系统(GNSS)网络的数据,计算了 56 个台站的静态共震变形和 15 个台站的动态位移波形。在距震中 36 公里的 ANTE 站观测到 MW7.8 卡赫拉曼马拉什地震的最大静态共震位移为 0.38 米,在距震中 5 公里的 EKZ1 站观测到 MW7.6 埃尔比斯坦地震的最大动态共震位移为 4.4 米。利用全球导航卫星系统的共震变形作为约束条件,对两次地震的破裂-滑动分布进行了反演。结果表明,卡赫拉曼马拉什地震的断裂段非常明显,并暴露在地面上,导致东安纳托利亚断层的阿马诺斯和帕扎尔奇克断裂段出现明显的断裂滑移。Pazarcik 断层段的最大滑移量为 10.7 米,断裂发生在 0-15 千米深处。在卡达克断层区域,埃尔比斯坦地震在 0-12 千米深处造成了明显的断裂,最大滑移量达到 11.6 米。卡赫拉曼马拉什地震沿卡达克断层段断裂造成的库仑应力变化约为 2 巴,库仑应力增加的区域与随后发生的 MW7.6 地震的断裂区域相对应。因此,MW7.8 地震很可能触发或促进了 MW7.6 地震。根据 MW7.8 和 MW7.6 事件的累积应力影响,东安纳托利亚断层西南段,特别是阿曼诺斯断层段,经历了超过 2 巴的库仑断裂应力变化,值得进一步关注,以评估其未来的地震灾害风险。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Coseismic deformation and fault slip distribution of the 2023 MW7.8 and MW7.6 earthquakes in Türkiye

On February 6, 2023, a devastating earthquake with a moment magnitude of MW7.8 struck the town of Pazarcik in south-central Türkiye, followed by another powerful earthquake with a moment magnitude of MW7.6 that struck the nearby city of Elbistan 9 h later. To study the characteristics of surface deformation caused by this event and the influence of fault rupture, this study calculated the static coseismic deformation of 56 stations and dynamic displacement waveforms of 15 stations using data from the Turkish national fixed global navigation satellite system (GNSS) network. A maximum static coseismic displacement of 0.38 m for the MW7.8 Kahramanmaras earthquake was observed at station ANTE, 36 km from the epicenter, and a maximum dynamic coseismic displacement of 4.4 m for the MW7.6 Elbistan earthquake was observed at station EKZ1, 5 km from the epicenter. The rupture-slip distributions of the two earthquakes were inverted using GNSS coseismic deformation as a constraint. The results showed that the Kahramanmaras earthquake rupture segment was distinct and exposed on the ground, resulting in significant rupture slip along the Amanos and Pazarcik fault segments of the East Anatolian Fault. The maximum slip in the Pazarcik fault segment was 10.7 m, and rupture occurred at depths of 0–15 km. In the Cardak fault region, the Elbistan earthquake caused significant ruptures at depths of 0–12 km, with the largest amount of slip reaching 11.6 m. The Coulomb stress change caused by the Kahramanmaras earthquake rupture along the Cardak fault segment was approximately 2 bars, and the area of increased Coulomb stress corresponded to the subsequent rupture region of the MW7.6 earthquake. Thus, it is likely that the MW7.8 earthquake triggered or promoted the MW7.6 earthquake. Based on the cumulative stress impact of the MW7.8 and MW7.6 events, the southwestern segment of the East Anatolian Fault, specifically the Amanos fault segment, experienced a Coulomb rupture stress change exceeding 2 bars, warranting further attention to assess its future seismic hazard risk.

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来源期刊
Earthquake Science
Earthquake Science GEOCHEMISTRY & GEOPHYSICS-
CiteScore
1.10
自引率
8.30%
发文量
42
审稿时长
3 months
期刊介绍: Earthquake Science (EQS) aims to publish high-quality, original, peer-reviewed articles on earthquake-related research subjects. It is an English international journal sponsored by the Seismological Society of China and the Institute of Geophysics, China Earthquake Administration. The topics include, but not limited to, the following ● Seismic sources of all kinds. ● Earth structure at all scales. ● Seismotectonics. ● New methods and theoretical seismology. ● Strong ground motion. ● Seismic phenomena of all kinds. ● Seismic hazards, earthquake forecasting and prediction. ● Seismic instrumentation. ● Significant recent or past seismic events. ● Documentation of recent seismic events or important observations. ● Descriptions of field deployments, new methods, and available software tools. The types of manuscripts include the following. There is no length requirement, except for the Short Notes. 【Articles】 Original contributions that have not been published elsewhere. 【Short Notes】 Short papers of recent events or topics that warrant rapid peer reviews and publications. Limited to 4 publication pages. 【Rapid Communications】 Significant contributions that warrant rapid peer reviews and publications. 【Review Articles】Review articles are by invitation only. Please contact the editorial office and editors for possible proposals. 【Toolboxes】 Descriptions of novel numerical methods and associated computer codes. 【Data Products】 Documentation of datasets of various kinds that are interested to the community and available for open access (field data, processed data, synthetic data, or models). 【Opinions】Views on important topics and future directions in earthquake science. 【Comments and Replies】Commentaries on a recently published EQS paper is welcome. The authors of the paper commented will be invited to reply. Both the Comment and the Reply are subject to peer review.
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