中文版 | English
Title

The 2021 Mw 7.3 Madoi, China Earthquake: Transient Supershear Ruptures on a Presumed Immature Strike-Slip Fault

Author
Corresponding AuthorDun Wang; Lihua Fang; Shiqing Xu
Joint first authorChuang Cheng
Publication Years
2023-02-01
DOI
Source Title
ISSN
2169-9313
EISSN
2169-9356
Volume128Issue: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
Important Publications
NI Journal Papers
SUSTech Authorship
Corresponding
Funding Project
National Key R & D Program of China["2018YFC0603500","2021YFC3000702"] ; NSFC["41874062","41922025","42074048"]
WOS Research Area
Geochemistry & Geophysics
WOS Subject
Geochemistry & Geophysics
WOS Accession No
WOS:000933666600001
Publisher
ESI Research Field
GEOSCIENCES
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/479585
DepartmentDepartment 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 AffilicationDepartment 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).
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).
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).
Files in This Item:
There are no files associated with this item.
Related Services
Recommend this item
Bookmark
Usage statistics
Export to Endnote
Export to Excel
Export to Csv
Altmetrics Score
Google Scholar
Similar articles in Google Scholar
[Chuang Cheng]'s Articles
[Dun Wang]'s Articles
[Qiang Yao]'s Articles
Baidu Scholar
Similar articles in Baidu Scholar
[Chuang Cheng]'s Articles
[Dun Wang]'s Articles
[Qiang Yao]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Chuang Cheng]'s Articles
[Dun Wang]'s Articles
[Qiang Yao]'s Articles
Terms of Use
No data!
Social Bookmark/Share
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.