Simulation of strong earthquake characteristics of a scenario earthquake (MS7.5) based on the enlightenment of 2022 MS6.9 earthquake in Menyuan

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

Earthquake Science Pub Date : 2022-12-01 DOI:10.1016/j.eqs.2022.11.001

Zhiwei Ji , Zongchao Li , Mengtan Gao , Jize Sun , Xiangyun Guo

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引用次数: 0

Abstract

The Menyuan area is an important transportation hub in the Hexi Corridor. The Menyuan M_S6.9 earthquake that occurred on January 8, 2022 had a major impact on the local infrastructure and transportation of this region. Due to the high possibility of similar strong earthquakes occurring in this area in the future, preliminary assessment of the seismic intensity characteristics of destructive earthquakes in this region is essential for effective disaster control. This paper uses the empirical Green′s function (EGF) method as a numerical simulation tool to predict the ground motion intensity of Datong Autonomous County under the action of the scenario earthquake (M_S7.5). Seismic records of aftershocks of the 2016 Menyuan M_S6.4 earthquake were used as Green’s functions for this simulation. The uncertainties associated with various source parameters were considered, and 36 possible earthquake scenarios were simulated to obtain 72 sets of horizontal ground motions in Datong County. The obtained peak ground acceleration (PGA) vs. time histories of the horizontal ground motion were screened using the attenuation relationships provided by the fifth-edition of China's Seismic Ground Motion Parameter Zoning Map and the NGA-West2 dataset. Ultimately, 32 possible acceleration-time histories were selected for further analysis. The screened PGA values ranged from 78.8 to 153 cm/s². The uncertainty associated with the initial rupture point was found to greatly affect the results of the earthquake simulation. The average acceleration spectrum of the selected acceleration-time history exceeded the expected spectrum of a intermediate earthquake, which means that buildings in Datong County might sustain some damage should the scenario earthquake occur. This research can provide reliable ground motion input for urban earthquake damage simulation and seismic design in Datong County. Growing the dataset of small earthquakes recorded in this region will facilitate the large-scale simulation of ground motions under different earthquake scenarios.

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基于2022年门源MS6.9地震启示的情景地震(MS7.5)强震特征模拟

门源地区是河西走廊重要的交通枢纽。2022年1月8日发生的门源里氏6.9级地震对该地区的基础设施和交通造成了重大影响。由于该地区未来发生类似强震的可能性较大，因此对该地区破坏性地震的烈度特征进行初步评估对于有效的灾害控制至关重要。本文采用经验格林函数(EGF)方法作为数值模拟工具，预测了情景地震(MS7.5)作用下大同自治县的地震动强度。本次模拟使用了2016年门源MS6.4地震余震的地震记录作为Green的函数。考虑各种震源参数的不确定性，模拟了36种可能的地震情景，得到了大同县72组水平地震动。利用第五版中国地震地震动参数分区图和NGA-West2数据集提供的衰减关系，对得到的峰值地加速度(PGA)与水平地震动时程进行了筛选。最终，我们选择了32种可能的加速时历史进行进一步分析。筛选的PGA值范围为78.8 ~ 153 cm/s2。发现与初始破裂点有关的不确定性对地震模拟的结果有很大影响。所选加速度-时间历史的平均加速度谱超过了预期的中间地震谱，说明在情景地震发生时，大同县的建筑物可能会受到一定的破坏。研究结果可为大同县城市震害模拟和抗震设计提供可靠的地震动输入。增加该地区小地震记录数据集，将有助于在不同地震情景下大规模模拟地面运动。

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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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.