InSAR-derived coseismic deformation field and seismogenic fault of the M6.2 Jishishan earthquake

doi:10.6046/zrzyyg.2024314

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Abstract

On December 18，2023，a M6.2 earthquake struck Jishishan Bonan，Dongxiang，and Salar Autonomous County，Gansu Province，China，with a maximum seismic intensity of VIII，causing severe environmental damage. This study aims to determine the basic parameters of the seismogenic fault and analyze its movement. To this end，this study，based on the two-pass differential interferometric synthetic aperture radar （D-InSAR） technique，obtained the coseismic deformation field of this earthquake using ascending and descending orbit from the Sentinel-1A satellite，as well as digital elevation model （DEM） data before and after the earthquake. Based on the dislocation theory in a homogeneous elastic half-space （the Okada dislocation model），a mapping model was established to link coseismic deformation and fault movement. The coseismic deformation field was used to fit the seismogenic fault，followed by the inversion for basic parameters of the seismogenic fault and the simulation of fault slip distribution. The results show that the maximum deformation from the ascending orbit data was about 6.65 cm，while that from the descending orbit data was about 7.12 cm. The seismogenic fault exhibited a strike of 308.14°，a dip angle of 61.57°，and a slip angle of 71.42°. Moreover，the fault presented a maximum slip of approximately 0.29 m located approximately 8 m below the surface and a moment magnitude of M_w6.17. The fault is characterized by thrust movement，with a minor left-lateral strike-slip movement. Based on the regional geological structure，the seismogenic fault is speculated to be the southern margin fault of Laji Mountain，with surface rupture caused by the earthquake.

Keywords Jishishan earthquake coseismic deformation interferometric synthetic aperture radar （InSAR） seismogenic fault

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Issue Date: 28 October 2025

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	Yufan XU
	Sheng LI
	Yanbo CAO
	Ruifeng HU

Cite this article:

Yufan XU,Sheng LI,Yanbo CAO, et al. InSAR-derived coseismic deformation field and seismogenic fault of the M6.2 Jishishan earthquake[J]. Remote Sensing for Natural Resources, 2025, 37(5): 216-223.

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https://www.gtzyyg.com/EN/10.6046/zrzyyg.2024314 OR https://www.gtzyyg.com/EN/Y2025/V37/I5/216

Fig.1 Background map of active tectonic activity in the Qinghai-Xizang Plateau and Jishishan earthquake region

Tab.1 Image acquisition schedule

Tab.2 Data introduction

Fig.2 Schematic diagram of microwave transmission

Fig.3 Technical flowchart

Fig.4 Deformation interferogram

Fig.5 Deformation fiel

Fig.6 Deformation profile

Tab.3 Source mechanism solutions for USGS and GCMT

Fig.7 The fitting results of the second set of fault parameters

Fig.8 Fault slip distribution results

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