2025/01/20 台南M6.2地震初步破裂模型

Preliminary rupture model of the 20 Jan. 2025 Tainan M6.2 earthquake

概述

根据中国地震台网中心测定, 本次地震发生于2025年1月20日16:17(UTC), 震中位于120.51°E, 23.24°N, 震源深度14千米.

根据USGS发布的震源机制解, 选择可能的两节面进行破裂过程反演， 采用走向为198°的东倾节面反演得到模型1, 采用走向为15°的西倾节面反演得到模型2, 两模型矩震级均为Mw=6.2, 破裂持续时间约为20秒, 主要破裂区域位于震源东南方向.

强震反演所需数据来自于Central Weather Administation (CWA, 2012), 采用台网中心给定的发震时刻和震源位置， 破裂模型的反演基于迭代反褶积叠加(IDS)方法(Zhang et al., 2014; Zheng et al., 2020), 格林函数采用QSSP程序(Wang et al., 2017)计算， 所用一维速度模型提取自USTClitho2.0模型(Han et al., 2021)

模型1下载: 20250120161727_Tainan20250120_Rupture_Info_1.txt

模型2下载: 20250120161727_Tainan20250120_Rupture_Info_2.txt

提供者：北京大学地球物理学系张勇研究组 徐晨雨

模型1

波形拟合

模型2

波形拟合

参考文献

1. Central Weather Administration. (2012). Central Weather Administration Seismographic Network [Data set]. International Federation of Digital Seismograph Networks. https://doi.org/10.7914/SN/T5.

2. Wang, R., Heimann, S., Zhang, Y., Wang, H., and Dahm, T. (2017). Complete synthetic seismograms based on a spherical self-gravitating Earth model with an atmosphere-ocean-mantle-core structure, Geophys. J. Int., 210, 1739-1764. https://doi.org/10.1093/gji/ggx259

3. Han, S., Zhang H., Xin H., Shen W., Yao H. (2021). USTClitho2.0: updated unified seismic tomography models for continental China lithosphere from joint inversion of body‐wave arrival times and surface‐wave dispersion data. Seismol. Res. Lett. https://doi.org/10.1785/0220210122.

4. Zhang, Y., Wang, R., Zschau, J., Chen, Y., Parolai, and Dahm, T. (2014). Automatic imaging of earthquake rupture processes by iterative deconvolution and stacking of high-rate GPS and strong motion seismograms, J. Geophys. Res. Solid Earth, 119, 5633-5650. https://doi.org/10.1002/2013JB010469

5. Zheng, X., Zhang, Y., Wang, R., Zhao, L., Li, W., and Huang, Q. (2020). Automatic inversions of strong‐motion records for finite‐fault models of significant earthquakes in and around Japan, J. Geophys. Res. Solid Earth, 125, e2020JB019992. https://doi.org/10.1029/2020JB019992