2025年1月7日西藏定日Ms 6.8地震震源机制InSAR反演及强地面运动快速模拟

王楠, 李永生, 申文豪, 姜文亮, 李强, 焦其松

王楠, 李永生, 申文豪, 姜文亮, 李强, 焦其松. 2025年1月7日西藏定日Ms 6.8地震震源机制InSAR反演及强地面运动快速模拟[J]. 武汉大学学报 ( 信息科学版), 2025, 50(2): 404-411. DOI: 10.13203/j.whugis20250022
引用本文: 王楠, 李永生, 申文豪, 姜文亮, 李强, 焦其松. 2025年1月7日西藏定日Ms 6.8地震震源机制InSAR反演及强地面运动快速模拟[J]. 武汉大学学报 ( 信息科学版), 2025, 50(2): 404-411. DOI: 10.13203/j.whugis20250022
WANG Nan, LI Yongsheng, SHEN Wenhao, JIANG Wenliang, LI Qiang, JIAO Qisong. Source Parameters and Rapid Simulation of Strong Ground Motion of the Ms6.8 Earthquake on January 7, 2025 in Dingri (Xizang,China) Derived from InSAR Observation[J]. Geomatics and Information Science of Wuhan University, 2025, 50(2): 404-411. DOI: 10.13203/j.whugis20250022
Citation: WANG Nan, LI Yongsheng, SHEN Wenhao, JIANG Wenliang, LI Qiang, JIAO Qisong. Source Parameters and Rapid Simulation of Strong Ground Motion of the Ms6.8 Earthquake on January 7, 2025 in Dingri (Xizang,China) Derived from InSAR Observation[J]. Geomatics and Information Science of Wuhan University, 2025, 50(2): 404-411. DOI: 10.13203/j.whugis20250022

2025年1月7日西藏定日Ms 6.8地震震源机制InSAR反演及强地面运动快速模拟

基金项目: 

国家自然科学基金 42374039

应急管理部国家自然灾害防治研究院基本科研业务专项 ZDJ2024-18

详细信息
    作者简介:

    王楠,助理研究员,主要从事InSAR灾害应急监测。wangnan@ninhm.ac.cn

    通讯作者:

    李永生,研究员。yongshengli@ninhm.ac.cn

Source Parameters and Rapid Simulation of Strong Ground Motion of the Ms6.8 Earthquake on January 7, 2025 in Dingri (Xizang,China) Derived from InSAR Observation

  • 摘要:

    北京时间2025-01-07,中国西藏自治区日喀则定日县发生了Ms 6.8地震,造成大量人员伤亡。地震发生在青藏高原拉萨地块内部,为快速获取此次地震的发震构造和准确理解震源机制,基于陆探1号(Lutan-1, LT-1)卫星升轨数据和Sentinel-1卫星降轨数据提取了本次地震的同震形变场,并以此作为约束资料对发震断层几何参数和滑动分布进行反演。同震形变场显示,发震地区以垂直变形和东西向伸展变形为主要特征,视线向最大变形量达到了2 m。反演结果表明,此次地震发生于一条走向为187°、倾角为40°的正断层,断层最大位错量达6 m,矩震级达到了Mw 7.1。基于反演断层滑动模型模拟地震烈度,结果显示此次地震最大烈度可达Ⅸ度。综合使用InSAR地震同震形变场和两步法断层参数反演算法快速获取地震震源机制和破裂参数,可为地震应急救援、烈度估算和震害分析等提供快速准确的数据支持。

    Abstract:
    Objectives 

    On January 7, 2025, an Ms 6.8 earthquake struck Dingri County, Shigatse City, Xizang Autonomous Region,China, resulting in numerous casualties. This earthquake took place within the Lhasa block of the Qinghai-Tibet Plateau. To swiftly ascertain the seismogenic structure of this earthquake and gain a precise understanding of its source mechanism, this study utilized ascending data from the Lutan-1 (LT-1) satellite and descending data from the Sentinel-1 satellite to extract surface coseismic deformation.

    Methods 

    This deformation data served as constraint information for the inversion of geometric parameters and slip distribution of the seismogenic fault.

    Results 

    The findings reveal that the earthquake-affected areas primarily exhibited near east-west extension deformation, with the maximum deformation in the line of sight direction attaining 2 m. The inversion outcomes demonstrate that the earthquake occurred on a normal fault with a strike of 187° and a dip angle of 40°, exhibiting a maximum slip of 6 m and a simulated moment magnitude of 7.1. By simulating earthquake intensity based on the estimated fault slip model, it was found that the maximum intensity of this earthquake could reach level Ⅸ.

    Conclusions 

    The integrated application of interferometry synthetic aperture radar seismic coseismic deformation field and a two-step fault parameter inversion algorithm achieved a rapid acquisition of the earthquake's source mechanism and rupture parameters. This approach offers swift and precise data support for earthquake emergency response, intensity estimation, and damage analysis.

  • http://ch.whu.edu.cn/cn/article/doi/10.13203/j.whugis20250022
  • 图  1   2025年1月7日定日Ms 6.8地震区域构造背景图

    Figure  1.   Regional Tectonic Background of the Ms 6.8 Dingri Earthquake on January 7, 2025

    图  2   LT-1和Sentinel-1 P48和P121 InSAR同震形变场

    Figure  2.   InSAR-Derived Coseismic Deformation Fields of LT-1 Dataset and P48 Dataset and P121 Dataset of Sentinel-1

    图  3   倾角和平滑系数变化的对数函数等值线图(α2),红星表示全局最小点

    Figure  3.   Contour Map of Log Function with Variations in Dips and Smoothing Coefficients (α2), the Red Star Indicates the Global Minimum Point

    图  4   最优分布式断层模型的滑动分布结果

    Figure  4.   Sliding Distribution Results of the Optimal Distributed Fault Model

    图  5   LT-1数据LOS向同震形变场、最优拟合模型解算的位移场和模型残差

    Figure  5.   LOS Coseismic Deformation Field, Simulated Coseismic Deformation Field, and Residual Distribution of LT-1 Dataset

    图  6   Sentinel-1 P48数据LOS向同震形变场、最优拟合模型解算的位移场和模型残差

    Figure  6.   LOS Coseismic Deformation Field, Simulated Coseismic Deformation Field, and Residual Distribution of Sentinel-1 P48 Dataset

    图  7   震源机制参数约束下的地震烈度快速估算结果

    Figure  7.   Seismic Intensity Results Estimated with the Constraint of Focal Mechanism Parameters

    图  8   InSAR形变结果与地表破裂光学影像解译及实地考察结果对比验证

    Figure  8.   InSAR Deformation Results and Optical Image Interpretation of Surface Rupture and Field Investigation Results

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出版历程
  • 收稿日期:  2025-01-14
  • 刊出日期:  2025-02-04

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