2016 年 6.8 级 Chauk 地震的宽带地面运动模拟

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS pure and applied geophysics Pub Date : 2024-04-08 DOI:10.1007/s00024-024-03475-3
Jahnabi Basu, S. T. G. Raghukanth
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引用次数: 0

摘要

2016 年缅甸乔克 Mw 6.8 地震是缅甸最大的地震之一,导致历史古迹遭受重大破坏,也是仪器时代发生的第一次地震。本研究模拟了震中周围 4.5° × 4.5° 区域的宽带(0.01-25 Hz)地动,以研究该事件的地动特征。为实现这一目标,将确定性生成的低频地动和随机模拟的高频地动结合起来,生成三分量宽带地震图。模拟地动还与近场和远场台站记录的现有强震数据进行了比较。因此,通过估计记录和模拟地面运动获得的 5%阻尼加速度响应谱之间的拟合度,可以量化地面运动建模的有效性。此外,还以等值线图的形式展示了整个地区模拟地动的峰值地面加速度(PGA)及其与该地区地形的空间变化。模拟的 PGA 还与为俯冲带岩床内地震开发的全球地面运动模型进行了比较。最重要的是,在蒲甘和 Nyuang-U 市严重受损的古迹位置生成了加速度时间历程,可进一步用于结构的非线性动态分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Simulation of Broadband Ground Motions for the 2016 Mw 6.8 Chauk Earthquake

The 2016 Mw 6.8 Chauk, Myanmar earthquake was one of the largest earthquakes in Myanmar, leading to significant damage to historical monuments and the first earthquake to occur in the instrumental era. In the current study, broadband (0.01–25 Hz) ground motions are simulated in the 4.5° × 4.5° region around the epicenter to investigate the ground-motion characteristics of the event. Towards this goal, deterministically generated low-frequency and stochastically simulated high-frequency ground motions are combined to create three-component broadband seismograms. The simulated ground motions are further compared with the available strong motion data recorded in the near-field and far-field stations. Thus, the efficacy in modeling the ground motions is quantified through the estimation of the goodness of fit between the 5% damped acceleration response spectra obtained from recorded and simulated ground motions. Furthermore, the peak ground acceleration (PGA) of the simulated ground motions for the entire region is presented in the form of a contour map along with its spatial variation with the region's topography. The simulated PGA is further compared with the global ground motion models developed for subduction zone intraslab earthquakes. Most importantly, acceleration time histories are generated at the locations of severely damaged monuments in Bagan and Nyuang-U city, which can further be utilized for nonlinear dynamic analysis of the structures.

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来源期刊
pure and applied geophysics
pure and applied geophysics 地学-地球化学与地球物理
CiteScore
4.20
自引率
5.00%
发文量
240
审稿时长
9.8 months
期刊介绍: pure and applied geophysics (pageoph), a continuation of the journal "Geofisica pura e applicata", publishes original scientific contributions in the fields of solid Earth, atmospheric and oceanic sciences. Regular and special issues feature thought-provoking reports on active areas of current research and state-of-the-art surveys. Long running journal, founded in 1939 as Geofisica pura e applicata Publishes peer-reviewed original scientific contributions and state-of-the-art surveys in solid earth and atmospheric sciences Features thought-provoking reports on active areas of current research and is a major source for publications on tsunami research Coverage extends to research topics in oceanic sciences See Instructions for Authors on the right hand side.
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