2025/12/08 日本本州东部海域M7.5地震震源机制及初步破裂模型

Focal mechanism and preliminary rupture models of the 8 Dec. 2025 M7.5 earthquake on the east coast of Honshu, Japan

概述

本次地震发生于2025年12月8日14:15(UTC+8)，强震快速反演所需强震数据来自NIED，采用USGS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，所用一维速度结构提取自CRUST1.0模型(Laske et al., 2012).使用USGS提供的矩张量解，选择西倾节面(走向184°，倾角17°，滑动角71°)进行反演， 矩震级Mw=7.5，主要破裂的持续时间约为60秒

联合反演采用了NIED的强震波形和IRIS的远震波形，两种数据等权，采用USGS给定的发震时刻及震源位置和GCMT的震源机制解(走向182°，倾角17°，滑动角70°)，反演方法见Zhang et al.(2012). 此次地震持续时间约为30秒，主要向北破裂，最大滑动量约为3.5米.

强震反演模型下载: 20251208141510_Japan20251208_Rupture_Info_1.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)

联合反演模型下载: 20251208141510_Japan20251208_Rupture_Info_2.txt

强震反演

波形拟合

滤波频带: 0.02-0.1 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.

联合反演

参考文献

1. 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.

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.

3. Zhang, Y., Feng W., Chen Y., et al. (2012).The 2009 L'Aquila MW 6.3 earthquake: A new technique to locate the hypocentre in the joint inversion of earthquake rupture process, Geophys. J. Int., 191(3): 1417-1426.

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.

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.