Coseismic Deformation Mechanisms of the 2021 Ms 6.4 Yangbi Earthquake, Yunnan Province, Using InSAR Observations

Zhang, Bing; Xu, Guochang; Lu, Zhiping; He, Yufang; Peng, Mimi; Feng, Xueshang

doi:10.3390/rs13193961

Open AccessArticle

Coseismic Deformation Mechanisms of the 2021 Ms 6.4 Yangbi Earthquake, Yunnan Province, Using InSAR Observations

by

Bing Zhang

^1,*

,

Guochang Xu

¹,

Zhiping Lu

^1,2,

Yufang He

¹,

Mimi Peng

³ and

Xueshang Feng

¹

Institute of Space Science and Applied Technology, Harbin Institute of Technology, Shenzhen 518055, China

²

Institute of Geospatial Information, Information Engineering University, Zhengzhou 450052, China

³

College of Geology Engineering and Geomatics, Chang′an University, Xi’an 710054, China

^*

Author to whom correspondence should be addressed.

Remote Sens. 2021, 13(19), 3961; https://doi.org/10.3390/rs13193961

Submission received: 31 July 2021 / Revised: 20 September 2021 / Accepted: 27 September 2021 / Published: 2 October 2021

(This article belongs to the Special Issue Into the Seismic Cycle: Remote Sensing of Ground Deformation and Earthquake Activity)

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Abstract

At 21:48 on 21 May 2021, an Ms 6.4 earthquake occurred in Yangbi County, Dali Prefecture, Yunnan Province. At present, uncertainty remains regarding the source parameters and deformation mechanism of the Yangbi earthquake. In this study, we determine fault geometry and slip distribution of the earthquake by InSAR analysis. Then, the Coulomb stress loading caused by the Yangbi earthquake is further analyzed. The results show that the moment magnitude of the Yangbi earthquake was Mw 6.14. The slip mainly occurred at depths of 3–13 km, with a maximum slip of approximately 61 cm at a depth of 6.98 km. The Yangbi earthquake was triggered by a blind fault in the NW-SE in the west parallel to the Weixi-Weishan Fault and its seismogenic fault exhibits strike-slip displacement. A large number of aftershocks were distributed along the fault rupture surface where the Coulomb stress increases. As the depth of the crust increases, the area where the Coulomb stress increases in the Yangbi earthquake, decreases. The occurrence of this earthquake also caused a significant increase in the Coulomb stress in the southeastern section of the Weixi-Weishan Faul. We should pay more attention to its seismic hazards.

Keywords: Yangbi earthquake; InSAR; slip distribution; Coulomb stress; Weixi-Weishan fault

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Zhang, B.; Xu, G.; Lu, Z.; He, Y.; Peng, M.; Feng, X. Coseismic Deformation Mechanisms of the 2021 Ms 6.4 Yangbi Earthquake, Yunnan Province, Using InSAR Observations. Remote Sens. 2021, 13, 3961. https://doi.org/10.3390/rs13193961

AMA Style

Zhang B, Xu G, Lu Z, He Y, Peng M, Feng X. Coseismic Deformation Mechanisms of the 2021 Ms 6.4 Yangbi Earthquake, Yunnan Province, Using InSAR Observations. Remote Sensing. 2021; 13(19):3961. https://doi.org/10.3390/rs13193961

Chicago/Turabian Style

Zhang, Bing, Guochang Xu, Zhiping Lu, Yufang He, Mimi Peng, and Xueshang Feng. 2021. "Coseismic Deformation Mechanisms of the 2021 Ms 6.4 Yangbi Earthquake, Yunnan Province, Using InSAR Observations" Remote Sensing 13, no. 19: 3961. https://doi.org/10.3390/rs13193961

APA Style

Zhang, B., Xu, G., Lu, Z., He, Y., Peng, M., & Feng, X. (2021). Coseismic Deformation Mechanisms of the 2021 Ms 6.4 Yangbi Earthquake, Yunnan Province, Using InSAR Observations. Remote Sensing, 13(19), 3961. https://doi.org/10.3390/rs13193961

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Coseismic Deformation Mechanisms of the 2021 Ms 6.4 Yangbi Earthquake, Yunnan Province, Using InSAR Observations

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