Source Parameters and Rapid Simulation of Strong Ground Motion of the Ms<italic style="font-style: italic"> </italic>6.8 Earthquake on January 7， 2025 in Dingri （Xizang，China） Derived from InSAR Observation

WANG Nan; LI Yongsheng; SHEN Wenhao; JIANG Wenliang; LI Qiang; JIAO Qisong

doi:10.13203/j.whugis20250022

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Source Parameters and Rapid Simulation of Strong Ground Motion of the Ms 6.8 Earthquake on January 7， 2025 in Dingri （Xizang，China） Derived from InSAR Observation

Jishishan Earthquake | 更新时间：2026-11-05

- Source Parameters and Rapid Simulation of Strong Ground Motion of the Ms 6.8 Earthquake on January 7， 2025 in Dingri （Xizang，China） Derived from InSAR Observation
- Geomatics and Information Science of Wuhan University Vol. 50, Issue 2, Pages: 404-411(2025)
- 作者机构：
  
  应急管理部国家自然灾害防治研究院，北京，100085
- 作者简介：
- 基金信息：
- DOI：10.13203/j.whugis20250022
  CLC： P237
- Received：15 January 2025，
  
  Published：05 February 2025
- 稿件说明：
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王楠,李永生,申文豪，等.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.

WANG Nan,LI Yongsheng,SHEN Wenhao,et al.Source Parameters and Rapid Simulation of Strong Ground Motion of the Ms 6.8 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.
王楠,李永生,申文豪，等.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,et al.Source Parameters and Rapid Simulation of Strong Ground Motion of the Ms 6.8 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

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.

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Source Parameters and Rapid Simulation of Strong Ground Motion of the Ms 6.8 Earthquake on January 7， 2025 in Dingri （Xizang，China） Derived from InSAR Observation

DOI：10.13203/j.whugis20250022

摘要

Abstract

关键词

Keywords

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