Broadband ground motion simulation using a hybrid approach of the May 21, 2021 M7.4 earthquake in Maduo, Qinghai, China

IF 1.2 4区地球科学 Q3 Earth and Planetary Sciences

Earthquake Science Pub Date : 2023-06-01 DOI:10.1016/j.eqs.2023.04.001

Yijun Liu , Xiaofen Zhao , Zengping Wen , Jie Liu , Bo Chen , Chunyao Bu , Chao Xu

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Abstract

In this study, the broadband ground motions of the 2021 M7.4 Maduo earthquake were simulated to overcome the scarcity of ground motion recordings and the low resolution of macroseismic intensity map in sparsely populated high-altitude regions. The simulation was conducted with a hybrid methodology, combining a stochastic high-frequency simulation with a low-frequency ground motion simulation, from the regional 1-D velocity structure model and the Wang WM et al. (2022) source rupture model, respectively. We found that the three-component waveforms simulated for specific stations matched the waveforms recorded at those stations, in terms of amplitude, duration, and frequency content. The validation results demonstrate the ability of the hybrid simulation method to reproduce the main characteristics of the observed ground motions for the 2021 Maduo earthquake over a broad frequency range. Our simulations suggest that the official map of macroseismic intensity tends to overestimate shaking by one intensity unit. Comparisons of simulations with empirical ground motion models indicate generally good consistency between the simulated and empirically predicted intensity measures. The high-frequency components of ground motions were found to be more prominent, while the low-frequency components were not, which is unexpected for large earthquakes. Our simulations provide valuable insight into the effects of source complexity on the level and variability of the resulting ground motions. The acceleration and velocity time histories and corresponding response spectra were provided for selected representative sites where no records were available. The simulated results have important implications for evaluating the performance of engineering structures in the epicentral regions of this earthquake and for estimating seismic hazards in the Tibetan regions where no strong ground motion records are available for large earthquakes.

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2021年5月21日中国青海玛多7.4级地震的混合方法宽带地震动模拟

为克服人口稀少的高海拔地区地震动记录少、大地震烈度图分辨率低的问题，模拟了2021年玛多M7.4级地震的宽带地震动。模拟采用混合方法进行，将随机高频模拟与低频地面运动模拟相结合，分别采用区域一维速度结构模型和Wang WM et al.(2022)震源破裂模型。我们发现，在振幅、持续时间和频率内容方面，特定台站模拟的三分量波形与这些台站记录的波形相匹配。验证结果表明，混合模拟方法能够在较宽的频率范围内再现2021年麻多地震观测到的地面运动的主要特征。我们的模拟表明，官方的大地震烈度图往往高估了一个烈度单位的震动。模拟与经验地面运动模型的比较表明，模拟强度与经验预测强度之间的一致性一般较好。发现地震动的高频分量更为突出，而低频分量则不突出，这对于大地震来说是出乎意料的。我们的模拟为震源复杂性对产生的地面运动的水平和可变性的影响提供了有价值的见解。给出了无记录的代表性站点的加速度和速度时程及相应的响应谱。模拟结果对评价震源区工程结构的性能和估计西藏地区没有强震记录的地震危险性具有重要意义。

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来源期刊

Earthquake Science GEOCHEMISTRY & GEOPHYSICS-

CiteScore

1.10

自引率

8.30%

发文量

审稿时长

3 months

期刊介绍： Earthquake Science (EQS) aims to publish high-quality, original, peer-reviewed articles on earthquake-related research subjects. It is an English international journal sponsored by the Seismological Society of China and the Institute of Geophysics, China Earthquake Administration. The topics include, but not limited to, the following ● Seismic sources of all kinds. ● Earth structure at all scales. ● Seismotectonics. ● New methods and theoretical seismology. ● Strong ground motion. ● Seismic phenomena of all kinds. ● Seismic hazards, earthquake forecasting and prediction. ● Seismic instrumentation. ● Significant recent or past seismic events. ● Documentation of recent seismic events or important observations. ● Descriptions of field deployments, new methods, and available software tools. The types of manuscripts include the following. There is no length requirement, except for the Short Notes. 【Articles】 Original contributions that have not been published elsewhere. 【Short Notes】 Short papers of recent events or topics that warrant rapid peer reviews and publications. Limited to 4 publication pages. 【Rapid Communications】 Significant contributions that warrant rapid peer reviews and publications. 【Review Articles】Review articles are by invitation only. Please contact the editorial office and editors for possible proposals. 【Toolboxes】 Descriptions of novel numerical methods and associated computer codes. 【Data Products】 Documentation of datasets of various kinds that are interested to the community and available for open access (field data, processed data, synthetic data, or models). 【Opinions】Views on important topics and future directions in earthquake science. 【Comments and Replies】Commentaries on a recently published EQS paper is welcome. The authors of the paper commented will be invited to reply. Both the Comment and the Reply are subject to peer review.