2024/04/02 花莲M7.3地震初步破裂模型

Preliminary rupture model of the 2th Apr. 2024 Hualian M7.3 earthquake

概述

本次地震发生于2024年4月2日23:58(UTC), 矩张量解根据Xu et al., (2023)的联合反演方法给出. 目前发震断层的倾向仍有待确定， 故选择两个可能的节面作为发震断层并发布. 采用走向为234°的节面反演得到模型1, 矩震级Mw=7.5, 破裂持续时间约为27秒; 采用走向为21°的节面反演得到模型2, 矩震级Mw=7.4, 破裂持续时间约为31秒. 两个模型均显示此次地震破裂向北延申.

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: 20240402235808_Hualian_strong_motion_1.txt

模型2下载: 20240402235808_Hualian_strong_motion_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

震源机制解

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模型1

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波形拟合

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模型2

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波形拟合

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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

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