Cascading multi-segment rupture process of the 2023 Turkish earthquake doublet on a complex fault system revealed by teleseismic P wave back projection method

IF 1.2 4区地球科学 Q3 Earth and Planetary Sciences Earthquake Science Pub Date : 2024-02-29 DOI:10.1016/j.eqs.2024.01.017

Bonan Cao , Zengxi Ge

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Abstract

In this study, the vertical components of broadband teleseismic P wave data recorded by China Earthquake Network are used to image the rupture processes of the February 6th, 2023 Turkish earthquake doublet via back projection analysis. Data in two frequency bands (0.5–2 Hz and 1–3 Hz) are used in the imaging processes. The results show that the rupture of the first event extends about 200 km to the northeast and about 150 km to the southwest, lasting ∼90 s in total. The southwestern rupture is triggered by the northeastern rupture, demonstrating a sequential bidirectional unilateral rupture pattern. The rupture of the second event extends approximately 80 km in both northeast and west directions, lasting ∼35 s in total and demonstrates a typical bilateral rupture feature. The cascading ruptures on both sides also reflect the occurrence of selective rupture behaviors on bifurcated faults. In addition, we observe super-shear ruptures on certain fault sections with relatively straight fault structures and sparse aftershocks.

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远震 P 波反向投影法揭示 2023 年土耳其双联地震在复杂断层系统上的级联多段破裂过程

本研究利用中国地震台网记录的宽带远震 P 波数据的垂直分量，通过反投影分析，对 2023 年 2 月 6 日土耳其双联地震的破裂过程进行成像。在成像过程中使用了两个频段（0.5-2 Hz 和 1-3 Hz）的数据。结果显示，第一个事件的断裂向东北方向延伸了约 200 公里，向西南方延伸了约 150 公里，总持续时间为 90 秒。西南方向的断裂是由东北方向的断裂引发的，显示出一种连续的双向单侧断裂模式。第二个事件的断裂向东北和西两个方向延伸了约 80 公里，总持续时间为 35 秒，表现出典型的双边断裂特征。两侧的级联破裂也反映了分叉断层的选择性破裂行为。此外，我们还在某些断层结构相对平直、余震稀疏的断层段上观测到超剪切破裂。

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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.