2025/12/27 宜兰M6.6地震初步破裂模型

Preliminary rupture model of the 27 Dec. 2025 Yilan M6.6 earthquake

概述

根据中国地震台网中心测定, 本次地震发生于2025年12月27日15:05 (UTC), 震中位于121.72°E, 23.33°N, 震源深度60千米.

断层参数根据GCMT(Global Centroid Moment Tensor)的矩张量结果确定(Ekström et al,2012), 走向177°, 倾角74°, 滑动角50°.

采用上述定位结果和初步震源机制确定断层几何, 反演所得破裂模型如下图所示. 持续时间约为10秒.

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CRUST1.0模型 (Laske et al., 2012).

模型下载: 20250611110027_Taidong20250611_Rupture_Info_2.txt

提供者：北京大学张勇研究组 徐晨雨(中国地震局地球物理研究所)

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波形拟合

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滤波频带: 0.02-0.2 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. Ekström, G., Nettles, M., and Dziewonski, A.(2012). The global CMT project 2004-2010: Centroid-moment tensors for 13,017 earthquakes, Phys. Earth Planet. Inter., 200-201, 1-9.

3. Laske, G., Masters, G, Ma, Z., and Pasyanos, M. (2012). CRUST1.0: An updated global model of Earth’s crust, Geophys. Res. Abs., 14, 3743.

4. 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

5. 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

6. 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