2025/06/11 台东M5.8地震初步破裂模型

Preliminary rupture model of the 11 Jun. 2025 Taidong M5.8 earthquake

概述

根据中国地震台网中心测定, 本次地震发生于2025年6月11日11:00 (UTC), 震中位于121.72°E, 23.33°N, 震源深度20千米.

根据USGS发布的震源机制解确定断层参数如下: 走向219°, 倾角28°, 滑动角110°.

采用上述定位结果和震源机制确定断层几何, 反演所得破裂模型如下图所示. 破裂向深部传播, 持续时间约为6秒, 主要破裂区域位于震源以西.

强震反演所需数据来自于Central Weather Administation (CWA, 2012), 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).

模型下载: 20250611110027_Taidong20250611_Rupture_Info_1.txt

提供者：北京大学地球物理学系张勇研究组 徐晨雨

波形拟合

滤波频带: 0.04-0.2 Hz.

图中数字含义分别为：左下, 观测波形滤波后最大振幅 (单位: mm); 右下, 相关系数; 右上, 归一化拟合残差.

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