4.7 Article

Source Model and Simulated Strong Ground Motion of the 2021 Yangbi, China Shallow Earthquake Constrained by InSAR Observations

Journal

REMOTE SENSING
Volume 13, Issue 20, Pages -

Publisher

MDPI
DOI: 10.3390/rs13204138

Keywords

the 2021 Yangbi earthquake; strike-slip fault; InSAR coseismic deformation; source modeling; fault interaction; peak ground acceleration (PGA); strong ground motion

Funding

  1. National Key R&D Program of China [2018YFC1504501]
  2. Special Fund of the Institute of Geophysics, China Earthquake Administration [DQJB20B18, DQJB21X25]

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An Mw 6.1 earthquake occurred in Yangbi County, Yunnan Province, China on May 21, 2021, resulting in significant seismic damage. Through the use of InSAR technique, the earthquake's surface deformation pattern, source characteristics, and strong ground motion were analyzed, revealing that the earthquake was dextral faulting with the maximum slip of 0.9 m on an unknown blind shallow fault, with a magnitude of 6.06.
On 21 May 2021, an Mw 6.1 earthquake, causing considerable seismic damage, occurred in Yangbi County, Yunnan Province of China. To better understand the surface deformation pattern, source characteristics, seismic effect on nearby faults, and strong ground motion, we processed the ascending and descending SAR images using the interferometric synthetic aperture radar (InSAR) technique to capture the radar line-of-sight (LOS) directional and 2.5-dimensional deformation. The source model was inverted from the LOS deformation observations. We further analyzed the Coulomb failure stress (CFS) transfer and peak ground acceleration (PGA) simulation based on the preferred source model. The results suggest that the 2021 Yangbi earthquake was dextral faulting with the maximum slip of 0.9 m on an unknown blind shallow fault, and the total geodetic moment was 1.4 x 10(18) Nm (Mw 6.06). Comprehensive analysis of the CFS transfer and geological tectonics suggests that the Dian-Xibei pull-apart basin is still suffering high seismic hazards. The PGA result demonstrates that the seismic intensity of this event reached up to VIII. The entire process from InSAR deformation to source modeling and strong ground motion simulation suggests that the InSAR technique will play an important role in the assessment of earthquake disasters in the case of the shortening of the SAR imaging interval.

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