Co-seismic P-wave velocity changes of 2023 Türkiye Earthquake Doublet

IF 1.2 4区地球科学 Q3 Earth and Planetary Sciences

Earthquake Science Pub Date : 2025-04-24 DOI:10.1016/j.eqs.2025.01.004

Xiaotian Xue , Shunping Pei , Zhi Wang , Hanlin Liu , Wei Liu , Lei Li , Jiawei Li , Qian Hua

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引用次数: 0

Abstract

On February 6, 2023, the Türkiye Earthquake Doublet, consisting of two major earthquakes with magnitudes of M_W7.8 and M_W7.5, respectively, occurred within 9 h and devastated the Kahramanmaraş province in southwest Turkey. The geodynamic background of this area is exceedingly complicated owing to the combined action of the Anatolian Plate and the neighboring Eurasian, African, and Arabian plates, which contain many faults, the most prominent of which is the East Anatolian Fault Zone (EAFZ). These two earthquakes occurred on the Pazarcık Segment (PAZ.S) of the EAFZ and the Çardak Fault (CAR. F). The investigation of co-seismic changes in the velocity structure of the subterranean medium inside the focus area is critical for our understanding of earthquake ruptures. We chose <styled-content style-type="number">51572</styled-content> travel times before the earthquake doublet from January 1, 2014, to February 5, 2023, and <styled-content style-type="number">88371</styled-content> travel times after the earthquakes from February 6 to March 5, 2023, and utilized time-lapse tomography to derive the co-seismic changes in P-wave velocity. The results demonstrated that the P-wave velocity decreased around the center zone, with considerable surface displacement from the two earthquakes caused by rock breakup and stress release. The P-wave velocity increased in two areas: east of the Pazarcik Earthquake, where the Bozova Fault is located, and west of the Elbistan Earthquake. We believe that these two locations are compression zones generated by the strike-slip surface displacement. Similarly, the decrease in velocity in the areas adjacent to the Malatya Fault (MAL.F) and between the Amanos Segment (AM.S) of the EAFZ and the Savur Fault (SA.F) shows that these two locations were exposed to tension as a result of the co-seismic horizontal displacement on the surface. This study showed that in addition to the area close to the epicenter, the large earthquake can affect the velocity structure of faults far away from the main shock.

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2023年 rkiye地震偶波同震纵波速度变化

2023年2月6日，土耳其西南部kahramanmaraku省在9小时内发生两次地震，分别为MW7.8级和MW7.5级。由于安纳托利亚板块与邻近的欧亚、非洲和阿拉伯板块的共同作用，该地区的地球动力学背景极其复杂，这些板块包含许多断裂，其中最突出的是东安纳托利亚断裂带（EAFZ）。这两次地震发生在EAFZ的Pazarcık段（PAZ.S）和Çardak断层（CAR）。F).研究震源区内地下介质速度结构的同震变化对我们理解地震破裂至关重要。我们选择了<；style -content style-type="number">51572<；地震前的旅行时间从2014年1月1日到2023年2月5日，> style- content style-type="number">88371</style -content>；2023年2月6日至3月5日地震后的旅行时间，并利用时移断层扫描获得纵波速度的同震变化。结果表明：在震源中心区附近，纵波速度减小，岩石破碎和应力释放引起的地表位移较大；纵波速度在两个区域有所增加：波佐娃断层所在的帕扎尔西克地震的东部和伊尔比斯坦地震的西部。我们认为这两个位置是由走滑地表位移产生的压缩带。同样，马拉蒂亚断层（Malatya Fault， MAL.F）附近以及EAFZ的Amanos段（AM.S）和Savur断层（SA.F）之间的速度下降表明，这两个位置由于地表同震水平位移而暴露在张力之下。本研究表明，大地震除了会影响靠近震中的区域外，还会影响远离主震的断层速度结构。

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来源期刊

Earthquake Science GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.10

自引率

8.30%

发文量

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.