﻿ GPS约束下的2022年台湾M<sub>W</sub>6.9地震破裂滑动分布
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 大地测量与地球动力学  2024, Vol. 44 Issue (2): 173-176  DOI: 10.14075/j.jgg.2023.04.168

### 引用本文

HU Xiaobin. Inversion for the Slip Distribution of the 2022 Taiwan MW6.9 Earthquake Based on GPS Displacements[J]. Journal of Geodesy and Geodynamics, 2024, 44(2): 173-176.

### Foundation support

Geographic Geological Information System, No. 2021D013.

### 作者简介

HU Xiaobin, PhD, senior engineer, majors in GPS data processing and geophysics application, E-mail: crfsdihuxiaobin@163.com.

### 文章历史

GPS约束下的2022年台湾MW6.9地震破裂滑动分布

1. 中铁第四勘察设计院集团有限公司，武汉市和平大道745号，430063

 红色五角星表示USGS测定的2022年台湾MW6.9地震震中；白色五角星为台湾气象局测定的震中位置。CRF：中央山脉断裂；LVF：纵谷断裂 图 1 GPS水平形变和震源破裂滑动分布 Fig. 1 GPS horizontal deformation and distribution of seismic source rupture slip
1 GPS同震形变

2 震源破裂特征 2.1 反演方法

 $\|\omega(G \cdot S-d)\|^2+\alpha^2\|L \cdot S\|^2=\min$ (1)

 图 2 2022年台湾MW6.9地震破裂滑动分布 Fig. 2 Slip distribution of the 2022 Taiwan MW6.9 earthquake
2.2 断层滑动分布反演结果

 图 3 GPS垂向位移 Fig. 3 GPS vertical displacements
3 结语

 [1] Huang Z C, Wang L S, Zhao D P, et al. Upper Mantle Structure and Dynamics beneath Southeast China[J]. Physics of the Earth and Planetary Interiors, 2010, 182(3-4): 161-169 DOI:10.1016/j.pepi.2010.07.010 (0) [2] Chung L H, Chen Y G, Wu Y M, et al. Seismogenic Faults along the Major Suture of the Plate Boundary Deduced by Dislocation Modeling of Coseismic Displacements of the 1951 M7.3 Hualien-Taitung Earthquake Sequence in Eastern Taiwan[J]. Earth and Planetary Science Letters, 2008, 269(3-4): 416-426 DOI:10.1016/j.epsl.2008.02.035 (0) [3] Yu S B, Chen H Y, Kuo L C. Velocity Field of GPS Stations in the Taiwan Area[J]. Tectonophysics, 1997, 274(1-3): 41-59 DOI:10.1016/S0040-1951(96)00297-1 (0) [4] Ai Y S, Chen Q F, Zeng F, et al. The Crust and Upper Mantle Structure beneath Southeastern China[J]. Earth and Planetary Science Letters, 2007, 260(3-4): 549-563 DOI:10.1016/j.epsl.2007.06.009 (0) [5] Kim K H, Chiu J M, Pujol J, et al. Three-Dimensional VP and VS Structural Models Associated with the Active Subduction and Collision Tectonics in the Taiwan Region[J]. Geophysical Journal International, 2005, 162(1): 204-220 DOI:10.1111/j.1365-246X.2005.02657.x (0) [6] Yagi Y, Okuwaki R, Enescu B, et al. Irregular Rupture Process of the 2022 Taitung, Taiwan, Earthquake Sequence[J]. Scientific Reports, 2023, 13 (0) [7] 岳汉, 张勇, 盖增喜, 等. 大地震震源破裂模型: 从快速响应到联合反演的技术进展及展望[J]. 中国科学: 地球科学, 2020, 50(4): 515-537 (Yue Han, Zhang Yong, Gai Zengxi, et al. Resolving Rupture Processes of Great Earthquakes: Reviews and Perspective from Fast Response to Joint Inversion[J]. Science China: Earth Sciences, 2020, 50(4): 515-537) (0) [8] Geng J H, Chen X Y, Pan Y X, et al. PRIDE PPP-AR: An Open-Source Software for GPS PPP Ambiguity Resolution[J]. GPS Solutions, 2019, 23(4) (0) [9] Olson A H, Apsel R J. Finite Faults and Inverse Theory with Applications to the 1979 Imperial Valley Earthquake[J]. Bulletin of the Seismological Society of America, 1982, 72(6A): 1 969-2 001 DOI:10.1785/BSSA07206A1969 (0) [10] Okada Y. Surface Deformation due to Shear and Tensile Faults in a Half-Space[J]. Bulletin of the Seismological Society of America, 1985, 75(4): 1 135-1 154 DOI:10.1785/BSSA0750041135 (0)
Inversion for the Slip Distribution of the 2022 Taiwan MW6.9 Earthquake Based on GPS Displacements
HU Xiaobin1
1. China Railway Siyuan Survey and Design Group Co Ltd, 745 Heping Road, Wuhan 430063, China
Abstract: Based on GPS displacements, we apply the finite fault method to inverse the slip distribution of the 2022 Taiwan MW6.9 earthquake. The results show that the earthquake ruptured to the surface, and the slip is dominated by strike-slip with a reverse component. It mainly extends along the fault in the NNE direction. There are two rupture concentrated areas, and the total released seismic moment is about 5.73×1019 Nm. Based on the analysis of the GPS observations and dislocation theoretical model, we infer that the coseismic deformation generally conforms to the regional tectonic movement characteristics of the east coast of Taiwan island. The subduction of the Eurasian plate by the Philippine sea plate is the main source of power for the Central Range fault activity.
Key words: Taiwan MW6.9 earthquake; GPS displacement; fault slip distribution