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

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

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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.

2023 Turkish earthquake doubletback projection methodcascading segmented rupture processcoseismic triggeringsuper-shear ruptures

Bonan Cao、Zengxi Ge

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Department of Geophysics, School of Earth and Space Sciences, Peking University, Beijing 100871, China

Hebei Hongshan National Geophysical Observatory for Thick Sediments and Seismic Hazards, Peking University, Beijing 100871, China

National Key R&D Program of ChinaNational Scientific Foundation of ChinaNational Scientific Foundation of China

2022YFF08006014193010341774047

2024

10.1016/j.eqs.2024.01.017

地震学报(英文版)
中国地震学会

地震学报(英文版)

影响因子：0.255
ISSN：1000-9116
年,卷(期)：2024.37(2)
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