安徽肥东Ms4.7地震动特征分析及高潜在震级地震的破坏能力估计
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作者单位:

1.长沙理工大学;2.中国地震局地球物理研究所;3.安徽省地震局;4.中国地震台网中心

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基金项目:

国家自然科学基金项目(面上项目,重点项目,重大项目)(Grant No.42574127),中国地震局地球物理研究所基本科研业务专项(Grant No.DQJB25Z03),国家自然科学基金基金(面上项目,重点项目,重大项目)(Grant No.52278435)


Analysis of Ground-Motion Characteristics of the Feidong, Anhui Ms4.7 Earthquake and Estimation of Damage Potential from High-Potential Magnitude Earthquake
Author:
Affiliation:

1.Changsha University of Science and Technology;2.Institute of Geophysics, China Earthquake Administration;3.Anhui Provincial Earthquake Bureau;4.China Earthquake Networks Center

Fund Project:

The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)(Grant No.42574127),Scientific Research Fund of Institute of Geophysics, China Earthquake Administration(Grant No.DQJB25Z03),The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan)(Grant No.52278435)

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    摘要:

    2024年9月18日安徽肥东发生一次MS4.7地震,造成一定的社会恐慌。本研究利用震中附近的135个多类型地震台站的地震记录,系统分析了该地震的加速度时程及反应谱、地震动衰减规律、地震动空间分布规律、地震动场地放大等综合特征。并以本次MS4.7地震作为小震格林函数并考虑震源参数的多种不确定性,采用经验格林函数方法模拟了本地区MS6.0设定地震的破坏能力估计,进一步探讨了更高潜在震级地震对本地区地震安全的启示。结果表明:(1)不同类型台站记录的地震动幅值差异显著。在位置相近的条件下,强震台记录的最大PGA和PGV分别是测震台的63.2倍和11.4倍,表明本地区较厚的覆盖土层对地震动破坏能力具有显著的放大作用,尤其是在0.1 s的地震动;(2)不同类型台站记录的地震动衰减规律差异明显,烈度台站的衰减速率明显高于强震台和测震台;(3)此次发生在厚覆盖土层区域的MS4.7地震,是同震级类型中破坏能力较强的一次事件;(4)MS6.0设定地震的PGA在部分位置可能达到0.8~1.0g,对应地震烈度可达X度。本文建议,应重点关注厚覆盖土层对特定周期地震动的显著放大效应,并评估未来高潜在震级地震对本地区超高层建筑结构安全的影响。

    Abstract:

    On September 18, 2024, an MS 4.7 earthquake struck Feidong County, Anhui Province, China, and caused considerable public concern. This study uses ground-motion records from 135 seismic stations of different types located near the epicenter. It systematically examines the acceleration time histories and response spectra, ground-motion attenuation, spatial distribution of shaking, and site amplification effects of this event. The MS 4.7 earthquake was further treated as a small-event Green’s function. Uncertainties in source parameters were also taken into account. Based on the empirical Green’s function method, the potential damage caused by a scenario MS 6.0 earthquake in this region was simulated and evaluated. The implications of larger potential earthquakes for regional seismic safety were then discussed. The results show that: (1) ground-motion amplitudes recorded by different types of stations differ significantly. Under similar location conditions, the peak PGA and PGV recorded by strong-motion stations are 63.2 and 11.4 times those recorded by regular seismic stations, respectively. This finding indicates that the thick sedimentary cover in the study area substantially amplifies the damaging potential of ground motion, especially at a period of 0.1 s; (2) the attenuation patterns of ground motion also vary markedly among different station types. The attenuation rate observed at intensity stations is clearly higher than that at strong-motion stations and regular seismic stations; (3) this MS4.7 earthquake, which occurred in an area with thick sedimentary cover, was a relatively destructive event among earthquakes of comparable magnitude; and (4) for the MS 6.0 scenario earthquake, the PGA may reach 0.8~1.0g at some locations, corresponding to a seismic intensity of up to X. This study suggests that special attention should be paid to the significant amplification effect of thick sedimentary cover on ground motions at specific periods. The potential impact of future larger-magnitude earthquakes on the structural safety of super high-rise buildings in this region should also be evaluated.

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  • 收稿日期:2026-02-07
  • 最后修改日期:2026-05-03
  • 录用日期:2026-05-11
  • 在线发布日期: 2026-07-31
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