中文版 | English
Title

Overall subshear but locally supershear rupture of the 2021 Mw 7.4 Maduo earthquake from high-rate GNSS waveforms and three-dimensional InSAR deformation

Author
Corresponding AuthorChen,Kejie
Publication Years
2022-09-20
DOI
Source Title
ISSN
0040-1951
EISSN
1879-3266
Volume839
Abstract
An M 7.4 left-lateral earthquake hit Maduo County in Qinghai province, China, on 21 May 2021. In this paper, we combined the 1-Hz global navigation satellite system (GNSS) displacement waveforms, GNSS static offsets and the three-dimensional (3D) co-seismic deformation field from the interferometric synthetic radar (InSAR) measurements to estimate the source kinematics of this event. Our results reveal that there was about 160 km of surface ruptures with varying strike angles, and the earthquake propagated bilaterally, with the bulk of the slip formed to the southeast of the epicenter. Substantial slip occurred to a depth of ~6 km, and the estimated maximum slip was ~5 m. The source time function presents a ~ 35-s total duration with two peaks, and the total geodetic seismic moment is 1.61 × 10 Nm (equivalent to M 7.4). The near-field high-rate GNSS waveforms inversion results indicate that this earthquake is an overall subshear but locally supershear rupture event. The preferred average rupture velocity is 2.8 km/s while the velocities to the southeast and northwest of epicenter are 3.8 and 2.2 km/s, respectively. Supershear enhanced ground motion and simulation using the 3D curvilinear grid finite-difference method shows the acceleration caused by the earthquake exceeded the building code limits for bridges that collapsed due to strong ground shaking. Furthermore, this earthquake increased the stress level of the Maqin–Maqu segment of the East Kunlun Fault, and was also responsible for an off-fault aftershock sequence at the northwest end of the earthquake rupture.
Keywords
URL[Source Record]
Indexed By
SCI ; EI
Language
English
SUSTech Authorship
First ; Corresponding
Funding Project
National Natural Science Foundation of China[42074024];National Natural Science Foundation of China[U1901602];
WOS Research Area
Geochemistry & Geophysics
WOS Subject
Geochemistry & Geophysics
WOS Accession No
WOS:000860273300003
Publisher
EI Accession Number
20223512646412
EI Keywords
Codes (symbols) ; Faulting ; Finite difference method ; Global positioning system ; Synthetic aperture radar
ESI Classification Code
Earthquake Measurements and Analysis:484.1 ; Radar Systems and Equipment:716.2 ; Data Processing and Image Processing:723.2 ; Numerical Methods:921.6
ESI Research Field
GEOSCIENCES
Scopus EID
2-s2.0-85136563648
Data Source
Scopus
Citation statistics
Cited Times [WOS]:9
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/395052
DepartmentDepartment of Earth and Space Sciences
Affiliation
Department of Earth and Space Sciences,Southern University of Science and Technology,Shenzhen,518055,China
First Author AffilicationDepartment of Earth and Space Sciences
Corresponding Author AffilicationDepartment of Earth and Space Sciences
First Author's First AffilicationDepartment of Earth and Space Sciences
Recommended Citation
GB/T 7714
Lyu,Mingzhe,Chen,Kejie,Xue,Changhu,et al. Overall subshear but locally supershear rupture of the 2021 Mw 7.4 Maduo earthquake from high-rate GNSS waveforms and three-dimensional InSAR deformation[J]. TECTONOPHYSICS,2022,839.
APA
Lyu,Mingzhe,Chen,Kejie,Xue,Changhu,Zang,Nan,Zhang,Wei,&Wei,Guoguang.(2022).Overall subshear but locally supershear rupture of the 2021 Mw 7.4 Maduo earthquake from high-rate GNSS waveforms and three-dimensional InSAR deformation.TECTONOPHYSICS,839.
MLA
Lyu,Mingzhe,et al."Overall subshear but locally supershear rupture of the 2021 Mw 7.4 Maduo earthquake from high-rate GNSS waveforms and three-dimensional InSAR deformation".TECTONOPHYSICS 839(2022).
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