2024/12/06 美国加州北部沿海近海M7.0地震震源机制、辐射能与初步破裂模型

Focal mechanism, radiated energy and preliminary rupture model of the 12 Dec 2024 M7.0 offshore Cape Mendocino, California earthquake in the United States

概述

本次地震发生于2024年12月5日18:44:21(UTC+8)，矩张量解使用Xu et al., (2023)的联合反演方法给出，速度结构模型基于PREM模型(Dziewonski & Anderson, 1981)以及CRUST1.0模型(Laske et al., 2012)

破裂过程反演选择东西走向断层，矩震级Mw=7.2，破裂持续时间约为40秒，破裂方向向东，反演所需强震数据来自CESMD，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).

模型下载: 20241205184421_California_Rupture_Info_2.txt

提供者：北京大学地球物理学系张勇研究组 徐贝贝 徐晨雨 周江诚

震源机制解(PREM)

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震源机制解(CRUST1.0)

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震源谱和辐射能量

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震源破裂过程

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波形拟合

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参考文献

1. Dziewonski, A. M., and Anderson, D. L. (1981). Preliminary reference Earth model. Physics of the earth and planetary interiors, 25(4), 297-356. https://doi.org/10.1016/0031-9201(81)90046-7

2. 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.

3. 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

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

6. Xu, B., Zhang Y. (2023). Joint inversion of centroid moment tensor for large earthquakes by combining teleseismic P-wave and W-phase records[J]. Geophy. J. Int., 234(2): 1143-1156. https://doi.org/10.1093/gji/ggad128