InSAR-Derived Coseismic Slip Model of the 2024 Ali Mw 5.6 Earthquake and Its Role on Landscape Evolution

WANG Yuexiang; WANG Teng

doi:10.13203/j.whugis20240453

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InSAR-Derived Coseismic Slip Model of the 2024 Ali Mw 5.6 Earthquake and Its Role on Landscape Evolution

更新时间：2026-11-05

- InSAR-Derived Coseismic Slip Model of the 2024 Ali Mw 5.6 Earthquake and Its Role on Landscape Evolution
- Geomatics and Information Science of Wuhan University Vol. 50, Issue 8, Pages: 1631-1638(2025)
- 作者机构：
  
  北京大学地球与空间科学学院，北京，100871
- 作者简介：
- 基金信息：
- DOI：10.13203/j.whugis20240453
  CLC： P237
- Received：29 November 2024，
  
  Published：05 August 2025
- 稿件说明：
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王悦翔,王腾.InSAR观测的2024年阿里地区日土县Mw 5.6地震同震模型及其在地形塑造中的作用[J].武汉大学学报（信息科学版）,2025,50(8):1631-1638.

WANG Yuexiang,WANG Teng.InSAR-Derived Coseismic Slip Model of the 2024 Ali Mw 5.6 Earthquake and Its Role on Landscape Evolution[J].Geomatics and Information Science of Wuhan University,2025,50(8):1631-1638.
王悦翔,王腾.InSAR观测的2024年阿里地区日土县Mw 5.6地震同震模型及其在地形塑造中的作用[J].武汉大学学报（信息科学版）,2025,50(8):1631-1638. DOI：10.13203/j.whugis20240453

WANG Yuexiang,WANG Teng.InSAR-Derived Coseismic Slip Model of the 2024 Ali Mw 5.6 Earthquake and Its Role on Landscape Evolution[J].Geomatics and Information Science of Wuhan University,2025,50(8):1631-1638. DOI：10.13203/j.whugis20240453

摘要

2024-04-13阿里地区日土县Mw 5.6地震发生于青藏高原中西部的羌塘板块内部的鲁玛江冬错断裂附近，经测定其发震震中（81.884°E，33.585°N）位于当地一座海拔5 500 m左右的无名山峰附近。利用Sentinel-1合成孔径雷达干涉测量（interferometric synthetic aperture radar，InSAR）数据量测了地震造成的同震地表形变场，联合使用非线性以及线性反演的方式确定了震源位置、几何参数，以及有限断层滑移模型。反演结果显示，这一次地震的发震断层走向约为336°，向东倾约66°，滑移分布矩心位置海拔超过5 435 m，是青藏高原内部近20年以来InSAR研究过的正断层地震中海拔最高的。通过滑移分布模拟的地表形变与当地地形的对比，发现这一处地震同震形变中的沉降集中在当地峰顶位置，呈现平整地貌的特征（即减小地形梯度），在一定程度上限制了山脉以及青藏高原继续隆起的趋势。这一次地震对于帮助人们认识正断层地震在高原地貌演化中的作用具有一定意义。

Abstract

Objectives

This study aims to investigate the landscape evolution effects of the 2024 Mw 5.6 earthquake that occurred in Ritu County

Ali region

on the Tibetan Plateau using interferometric synthetic aperture radar (InSAR) observations. The research seeks to explore the geodynamic processes and the role of normal faulting earthquakes in the topographic development of the Tibetan Plateau.

Methods

We utilized Sentinel-1 synthetic aperture radar data to capture the coseismic deformation field. Nonlinear and linear inversion methods were applied to determine the source location

geometric parameters

and finite fault slip distribution. The Okada model was used to calculate the three-dimensional coseismic deformation field

which was then compared with the local topography.

Results

The inversion results revealed that the Ritu earthquake had a strike of 336°

a dip of 66° to the east

and a predominantly normal slip component with a minor right-lateral component. The centroid of the slip distribution was located at an altitude of over 5 435 m

making it the highest-altitude normal faulting earthquake recorded by InSAR in the Tibetan Plateau interior over the past 20 years. The comparison between the coseismic deformation field and the local topography indicated that the subsidence was concentrated at the summit

flatten local topography by reducing the gradient

thereby limiting the continuous uplift of the Tibetan Plateau.

Conclusions

The study concludes that the 2024 Ali earthquake

with its high epicentral elevation

played a significant role in restraining the further uplift of the Tibetan Plateau. The findings

to some extent

support the gravitational collapse theory of normal faulting earthquakes within the plateau and provide insights into the intrinsic mechanisms that prevent the Tibetan Plateau from continually uplifting. This research highlights the importance of high-altitude normal faulting earthquakes in shaping the landscape of the Tibetan Plateau.

关键词

Keywords

references

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