2025/03/28 缅甸Mw7.8地震辐射能与破裂模型

Radiated energy and rupture model of the 28 Mar 2025 Myanmar Mw7.8 earthquake

概述

本次地震发生于2025年3月28日6:20(UTC)，采用Xu and Zhang (2023)的联合反演方法确定震源机制，速度结构基于CRUST1.0模型(Laske et al., 2012),

破裂过程反演选择南北向断层，采用USGS提供的定位结果，矩震级Mw=7.8，破裂持续时间约为88秒. 根据该模型，此次地震以右旋走滑机制为主，呈现双侧破裂特征，破裂主要向南延申. 远震反演所需数据来自于IRIS，格林函数采用QSSP程序(Wang et al., 2017)计算，所用一维速度结构为AK135模型(Kennett et al., 1995)， 反演所用软件为Ruptel 3.0(Zhang et al., 2012).

模型下载：20250328062056_Myanmar_Rupture_Info.txt

提供者：北京大学地球物理学系张勇研究组 张勇 徐贝贝 周江诚

破裂模型

波形拟合

震源谱和辐射能量

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. Kennett B., Engdahl E., and Buland R. (1995). Constraints on seismic velocities in the earth from travel times, Geophys. J. Int. 122, 108–124. https://doi.org/10.1111/j.1365-246X.1995.tb03540.x

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

5. Zhang Y., Feng W., Chen Y., Xu L., Li Z., Forrest D. (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, 1417-1426. https://doi.org/10.1111/j.1365-246X.2012.05694.x