Fault Kinematics of the 2022 Delingha Mw 5.6 and Mw 5.7 Earthquakes Revealed by InSAR Observations

Between January and April 2022, three moderate earthquakes (Mw 5.6 on 23 January, Mw 5.7 on 25 March, and Mw 5.1 on 15 April) struck the Hala Lake area of Delingha, Qinghai, China. Their seismogenic faults are poorly mapped, resulting in an unclear understanding of their kinematics and regional seis...

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Published in:Remote sensing (Basel, Switzerland) Vol. 16; no. 22; p. 4237
Main Authors: Wang, Xuening, Wu, Donglin, Liu, Lian, Li, Chenglong, Bai, Yongliang, Huang, Xing
Format: Journal Article
Language:English
Published: Basel MDPI AG 01.11.2024
Subjects:
2022 Delingha earthquakes
Algorithms
Artificial satellites in remote sensing
Bayesian analysis
China
coulomb failure stress change
Earthquakes
Fault lines
finite-fault inversion
InSAR
Interferometric synthetic aperture radar
Inversions
Kinematics
Rupturing
Seismic activity
Seismology
Slip
Software
Spatial distribution
Synthetic aperture radar
China
Tibetan Plateau
ISSN:2072-4292, 2072-4292
Online Access:Get full text
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Summary:Between January and April 2022, three moderate earthquakes (Mw 5.6 on 23 January, Mw 5.7 on 25 March, and Mw 5.1 on 15 April) struck the Hala Lake area of Delingha, Qinghai, China. Their seismogenic faults are poorly mapped, resulting in an unclear understanding of their kinematics and regional seismotectonics. In this study, we employed Interferometric Synthetic Aperture Radar (InSAR) observations to reconstruct the coseismic deformation fields of the Mw 5.6 and 5.7 events. We then utilized a Bayesian inversion algorithm to delineate the fault geometries of the two events, and further resolved their coseismic fault slip. Our results reveal that these earthquakes ruptured different fault planes: the fault plane of the Mw 5.6 event dips westward at an angle of 60°, while the Mw 5.7 event ruptured as a nearly vertical fault with a dipping angle of 89°. The finite-fault slip inversions further demonstrate that the coseismic rupture of the Mw 5.6 event was predominantly concentrated between depths of 2 km and 7 km, with a maximum slip of 0.18 m; in contrast, the Mw 5.7 event was mainly concentrated between depths of 2 km and 9 km, with a maximum slip of 0.4 m. We calculated the coseismic Coulomb failure stress change (ΔCFS) induced by these two earthquakes. Integrating the analysis of ΔCFS and the spatial distribution of aftershocks, we argue that the sequence earthquakes were triggered by the proceeding earthquakes.
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ISSN:2072-4292
2072-4292
DOI:10.3390/rs16224237