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Post-Seismic InSAR Deformation and Mechanism of the Wenchuan M8.0 Earthquake
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Mengyuan CAO1, 2, Lingyun JI2, *, Xin LIAO1, 3, 4, Yanhui LIU2, Chuanjin LIU2, Yun SHI1, 3, Liangyu ZHU2, Guohua XIONG2
Journal of Geodesy and Geodynamics | 2025, 45(6) : 633 - 639
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Journal of Geodesy and Geodynamics | 2025, 45(6): 633-639
Post-Seismic InSAR Deformation and Mechanism of the Wenchuan M8.0 Earthquake
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Mengyuan CAO1, 2, Lingyun JI2, *, Xin LIAO1, 3, 4, Yanhui LIU2, Chuanjin LIU2, Yun SHI1, 3, Liangyu ZHU2, Guohua XIONG2
Affiliations
  • 1 Institute of Disaster Prevention, 465 Xueyuan Street, Sanhe 065201, China
  • 2 The Second Monitoring and Application Center, CEA, 316 Xiying Road, Xi'an 710054, China
  • 3 Hebei Key Laboratory of Resource and Environmental Disaster Mechanism and Risk Monitoring, 465 Xueyuan Street, Sanhe 065201, China
  • 4 Hebei Key Laboratory of Earthquake Dynamics, 465 Xueyuan Street, Sanhe 065201, China

    • CAO Mengyuan, postgraduate, majors in InSAR deformation monitoring and tectonic deformation, E-mail:

About Author:

CAO Mengyuan, postgraduate, majors in InSAR deformation monitoring and tectonic deformation, E-mail:

Published: 2025-06-15 doi: 10.14075/j.jgg.2024.07.337
Outline
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We collect 243 descending-track Sentinel-1 SAR data covering the Longmenshan fault zone from October 2014 to April 2019 to obtain the post-seismic deformation of the Wenchuan M8.0 earthquake. Based on the co-seismic rupture model and regional layered media model, we conduct simulations of post-seismic viscoelastic relaxation and post-seismic afterslip inversion to estimate the relative contributions of the two mechanisms to post-seismic deformation. The results show that: 1)The post-seismic deformation on both sides of the Longmenshan fault zone exhibit distinct differences.The deformation in northwest side of the fault shows upward in LOS direction, with a maximum cumulative deformation of approximately 41.1 mm, located near Yingxiu. 2)The simulated values of viscoelastic relaxation cannot explain the actual post-seismic deformation observed by near-field InSAR. However, the deformation caused by viscoelastic relaxation in the middle-far-field region is consistent with the deformation observed by InSAR.3)Post-seismic afterslip mainly occurs in the vicinity of epicenter, primarily in areas where little or no slip occurred during the co-seismic. In conclusion, the post-seismic deformation mechanism of Wenchuan earthquake mainly involves afterslip and viscoelastic relaxation, the post-seismic afterslip dominated to the near-field deformation and viscoelastic relaxation contributed to the middle-far-field deformation.

Wenchuan earthquake  /  post-seismic deformation mechanism  /  viscoelastic relaxation  /  fault afterslip  /  InSAR deformation observations
曹梦圆, 季灵运, 廖欣, 刘艳慧, 刘传金, 石云, 朱良玉, 熊国华. 汶川8.0级地震震后InSAR形变及机制研究. 大地测量与地球动力学, 2025 , 45 (6) : 633 -639 . DOI: 10.14075/j.jgg.2024.07.337
Mengyuan CAO, Lingyun JI, Xin LIAO, Yanhui LIU, Chuanjin LIU, Yun SHI, Liangyu ZHU, Guohua XIONG. Post-Seismic InSAR Deformation and Mechanism of the Wenchuan M8.0 Earthquake[J]. Journal of Geodesy and Geodynamics, 2025 , 45 (6) : 633 -639 . DOI: 10.14075/j.jgg.2024.07.337
Funding
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  • National Key Research and Development Program of China(2023YFC3007303)
  • Fundamental Research Funds for the Central Universities(ZY20240304)
  • The Spark Program of Earthquake Technology of CEA(XH23063A)
  • Open Fund of Hebei Key Laboratory of Earthquake Dynamics(FZ246105)
  • National Natural Science Foundation of China(41602274)
Appendix
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Year 2025 volume 45 Issue 6
29
11
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Article Info
doi: 10.14075/j.jgg.2024.07.337
  • Receive Date：2024-07-11
  • Online Date：2026-10-30
  • Published：2025-06-15
Article Data
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History
  • Received：2024-07-11
Funding
National Key Research and Development Program of China(2023YFC3007303)
Fundamental Research Funds for the Central Universities(ZY20240304)
The Spark Program of Earthquake Technology of CEA(XH23063A)
Open Fund of Hebei Key Laboratory of Earthquake Dynamics(FZ246105)
National Natural Science Foundation of China(41602274)
Affiliations
    1 Institute of Disaster Prevention, 465 Xueyuan Street, Sanhe 065201, China
    2 The Second Monitoring and Application Center, CEA, 316 Xiying Road, Xi'an 710054, China
    3 Hebei Key Laboratory of Resource and Environmental Disaster Mechanism and Risk Monitoring, 465 Xueyuan Street, Sanhe 065201, China
    4 Hebei Key Laboratory of Earthquake Dynamics, 465 Xueyuan Street, Sanhe 065201, China
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
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Percentage of
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鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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