The 2021 M-w 7.4 Madoi Earthquake: An Archetype Bilateral Slip-Pulse Rupture Arrested at a Splay Fault

Chen, Kejie1; Avouac, Jean-Philippe2; Geng, Jianghui3; Liang, Cunren4; Zhang, Zhenguo1; Li, Zhicai5; Zhang, Shengpeng6,7

2022-01-28

10.1029/2021GL095243

GEOPHYSICAL RESEARCH LETTERS   影响因子和分区

0094-8276

1944-8007

We combine measurements of ground deformation from Synthetic Aperture Radar images, high-rate Global Navigation Satellite System and tele-seismic waveforms to study the rupture kinematics of the Madoi Earthquake, which occurred in eastern Tibet on 21 May 2021 and reached a moment magnitude M-w 7.4. The data show nearly pure left-lateral motion along a 170 km long rupture and a total duration of 36 s. The earthquake initiated near the middle of the main segment and evolved in a bilateral slip pulse rupture which propagated at a sub-Rayleigh speed of 2.6-2.8 km/s. In our model, slip is concentrated at depth of less than similar to 15 km and reaches a maximum of 4.2 m. The rupture arrested similar to 10 s after branching on the extensional splay faults at both extremities. The branching onto the splay faults and the eventual arrest of the rupture is used to provide constraints on the fault frictional properties.

Madoi Earthquake splay fault bilateral rupture high-rate Global Navigation Satellite System (HR-GNSS)

SCI ; EI

英语

ESI高被引

第一

National Natural Science Foundation of China[42074024] ; National Key Research and Development Program of China[2018YFC1503601]

Geology

Geosciences, Multidisciplinary

WOS:000751642800013

AMER GEOPHYSICAL UNION

20220511571377

Communication satellites ; Earthquakes ; Fault slips ; Space-based radar ; Synthetic aperture radar

Seismology:484 ; Earthquake Measurements and Analysis:484.1 ; Communication Satellites:655.2.1 ; Radar Systems and Equipment:716.2

GEOSCIENCES

Web of Science

1.Southern Univ Sci & Technol, Dept Earth & Space Sci, Shenzhen, Peoples R China
2.CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA
3.Wuhan Univ, GNSS Resarch Ctr, Wuhan, Peoples R China
4.Peking Univ, Sch Earth & Space Sci, Beijing, Peoples R China
5.China Univ Min & Technol Beijing, Sch Geosci & Surveying Engn, Beijing, Peoples R China
6.Qinghai Normal Univ, Sch Geog Sci, Xining, Peoples R China
7.Qinghai Basic Surveying & Mapping Inst, Xining, Peoples R China

Chen, Kejie,Avouac, Jean-Philippe,Geng, Jianghui,et al. The 2021 M-w 7.4 Madoi Earthquake: An Archetype Bilateral Slip-Pulse Rupture Arrested at a Splay Fault[J]. GEOPHYSICAL RESEARCH LETTERS,2022,49(2).

Chen, Kejie.,Avouac, Jean-Philippe.,Geng, Jianghui.,Liang, Cunren.,Zhang, Zhenguo.,...&Zhang, Shengpeng.(2022).The 2021 M-w 7.4 Madoi Earthquake: An Archetype Bilateral Slip-Pulse Rupture Arrested at a Splay Fault.GEOPHYSICAL RESEARCH LETTERS,49(2).

Chen, Kejie,et al."The 2021 M-w 7.4 Madoi Earthquake: An Archetype Bilateral Slip-Pulse Rupture Arrested at a Splay Fault".GEOPHYSICAL RESEARCH LETTERS 49.2(2022).