Title | The 2021 Mw 7.3 Madoi, China Earthquake: Transient Supershear Ruptures on a Presumed Immature Strike-Slip Fault |
Author | |
Corresponding Author | Dun Wang; Lihua Fang; Shiqing Xu |
Joint first author | Chuang Cheng |
Publication Years | 2023-02-01
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DOI | |
Source Title | |
ISSN | 2169-9313
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EISSN | 2169-9356
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Volume | 128Issue:2 |
Abstract | We used seismic data recorded at local and teleseismic distances to analyze the May 22, 2021 Mw 7.3 Madoi, China earthquake sequence, which occurred along a low-slip-rate (0.3-1.0 mm/yr) and small-cumulative-displacement (4-5 km) fault & mdash;the Kunlun Mountain Pass-Jiangcuo Fault (KMPJF). We first restored the clipped waveforms recorded at local distances, and obtained more accurate phase arrivals for relocating the earthquake sequence. The relocated earthquakes illuminate a similar to 170 km-long complex northwest-southeast (NW-SE) striking ruptured fault with apparent bifurcated ends at both tips and variations in dip angles along strike. We further performed backprojection analyses to image the rupture process of the mainshock using seismic data recorded at four teleseismic arrays (Europe, Australia and Southeast Asia, Japan, and Alaska). The results show that the earthquake propagated bilaterally in the NW and SE directions with maximum rupture speeds of similar to 4.0 km/s. This observation was further refined by multiple array backprojections onto the fault that was determined by the fine relocations of the earthquake sequence. Synthetic and realistic tests validated the resolutions of the backprojection analyses (within 5-20 km). The fast supershear rupture speeds were only transient but exhibited spatial correlation with the geometric complexities of the KMPJF. This suggests that the transient supershear ruptures are due to the varying geometry of the KMPJF, which is likely an immature fault. Our results suggest that the potential for supershear ruptures along immature strike-slip faults should be emphasized in earthquake hazard assessment. |
Keywords | |
URL | [Source Record] |
Indexed By | |
Language | English
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Important Publications | NI Journal Papers
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SUSTech Authorship | Corresponding
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Funding Project | National Key R & D Program of China["2018YFC0603500","2021YFC3000702"]
; NSFC["41874062","41922025","42074048"]
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WOS Research Area | Geochemistry & Geophysics
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WOS Subject | Geochemistry & Geophysics
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WOS Accession No | WOS:000933666600001
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Publisher | |
ESI Research Field | GEOSCIENCES
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Data Source | Web of Science
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Citation statistics |
Cited Times [WOS]:0
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Document Type | Journal Article |
Identifier | http://kc.sustech.edu.cn/handle/2SGJ60CL/479585 |
Department | Department of Earth and Space Sciences |
Affiliation | 1.Badong National Observation and Research Station of Geohazards, School of Earth Sciences, China University of Geosciences, Wuhan, China 2.Institute of Geophysics, China Earthquake Administration, Beijing, China 3.Department of Earth and Space Sciences, Southern University of Science and Technology, Shenzhen, China |
Corresponding Author Affilication | Department of Earth and Space Sciences |
Recommended Citation GB/T 7714 |
Chuang Cheng,Dun Wang,Qiang Yao,et al. The 2021 Mw 7.3 Madoi, China Earthquake: Transient Supershear Ruptures on a Presumed Immature Strike-Slip Fault[J]. JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,2023,128(2).
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APA |
Chuang Cheng.,Dun Wang.,Qiang Yao.,Lihua Fang.,Shiqing Xu.,...&Xiaolin Huang.(2023).The 2021 Mw 7.3 Madoi, China Earthquake: Transient Supershear Ruptures on a Presumed Immature Strike-Slip Fault.JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH,128(2).
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MLA |
Chuang Cheng,et al."The 2021 Mw 7.3 Madoi, China Earthquake: Transient Supershear Ruptures on a Presumed Immature Strike-Slip Fault".JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 128.2(2023).
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