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

Chen, Kejie and Avouac, Jean-Philippe and Geng, Jianghui and Liang, Cunren and Zhang, Zhenguo and Li, Zhicai and 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). Art. No. e2021GL095243. ISSN 0094-8276. doi:10.1029/2021gl095243. https://resolver.caltech.edu/CaltechAUTHORS:20220120-890583000

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Abstract

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 ∼15 km and reaches a maximum of 4.2 m. The rupture arrested ∼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.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1029/2021GL095243DOIArticle
https://scihub.copernicus.eu/Related ItemOriginal Copernicus Sentinel-1 data
https://search.asf.alaska.edu/Related ItemAlaska Satellite Facility
https://ds.iris.edu/wilber3/find_stations/11417068Related ItemTeleseismic waveforms (IRIS)
https://doi.org/10.5281/zenodo.5090461DOISAR data
ORCID:
AuthorORCID
Chen, Kejie0000-0002-8878-1731
Avouac, Jean-Philippe0000-0002-3060-8442
Geng, Jianghui0000-0002-8776-5801
Liang, Cunren0000-0003-3938-426X
Zhang, Zhenguo0000-0002-0059-1766
Alternate Title:The 2021 Mw 7.4 Madoi Earthquake: An Archetype Bilateral Slip-Pulse Rupture Arrested at a Splay Fault
Additional Information:© 2022. American Geophysical Union. Issue Online: 19 January 2022. Version of Record online: 19 January 2022. Accepted manuscript online: 10 January 2022. Manuscript accepted: 28 December 2021. Manuscript revised: 17 December 2021. Manuscript received: 22 July 2021. This research was funded by the National Natural Science Foundation of China (Grant No. 42074024), the Young Talent Promotion Project of China Association for Science and Technology, and National Key Research and Development Program of China (2018YFC1503601). We have further benefited from fruitful discussions with Shiqing Xu, Lingling Ye, and Jing Liu. We also thank three anonymous reviewers and the Editor Germán Prieto for helpful reviews. Data Availability Statement: Original Copernicus Sentinel-1 data were acquired by the European Space Agency (https://scihub.copernicus.eu/) and downloaded from the Alaska Satellite Facility (https://search.asf.alaska.edu/#/). GNSS stations QHMD and QHMQ were operated by the Crustal Movement Observation Network of China, and other GNSS data were from the continuously operating reference stations network operated by the local government (Li et al., 2021). Teleseismic waveforms were obtained through the Data Management Center of the Incorporated Research Institutions for Seismology (https://ds.iris.edu/wilber3/find_stations/11417068). All of the links are last accessed 2021 June and the SAR data are stored at https://doi.org/10.5281/zenodo.5090461, and high-rate GNSS in Seismic Analysis Code (SAC) format is provided in the supplementary data set. The preferred slip model parameters are listed in Table S4 in Supporting Information S1. Most of the figures in this paper were prepared using Generic Mapping Tools (Wessel et al., 2013).
Group:Seismological Laboratory
Funders:
Funding AgencyGrant Number
National Natural Science Foundation of China42074024
Young Talent Promotion Project of China Association for Science and TechnologyUNSPECIFIED
National Key Research and Development Program of China2018YFC1503601
Subject Keywords:Madoi Earthquake; splay fault; bilateral rupture; high-rate Global Navigation Satellite System (HR-GNSS)
Issue or Number:2
DOI:10.1029/2021gl095243
Record Number:CaltechAUTHORS:20220120-890583000
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20220120-890583000
Official Citation:Chen, K., Avouac, J.-P., Geng, J., Liang, C., Zhang, Z., Li, Z., & Zhang, S. (2022). The 2021 Mw 7.4 Madoi Earthquake: An archetype bilateral slip-pulse rupture arrested at a splay fault. Geophysical Research Letters, 49, e2021GL095243. https://doi.org/10.1029/2021GL095243
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113025
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:21 Jan 2022 18:37
Last Modified:21 Jan 2022 18:37

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