应用邻近强震动站点主余震记录的场地及地形效应分析

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摘要 2022年1月8日青海门源发生MS 6.9级地震，在震源相同、路径类似的条件下，间距5.5 km的地震烈度仪站点观测到的地震动加速度存在较大差异，针对此现象，应用主余震强震动记录，分别使用谱比法（horizontal-to-vertical spectra ratio, HVSR）和标准谱比法（standard spectra ratio, SSR）分析了场地效应与地形效应对地震动的影响，并提出了通过移动带通滤波器的高频截止频率来确定地面峰值加速度（peak ground acceleration, PGA）的主要贡献频段的方法。考虑场地效应和地形放大效应等因素，在不同频带内初步分析了PGA偏差较大的原因。

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	张世亮1
	2
	马强1
	2
	陶冬旺1
	2
	钱亮1
	2
	李继龙1
	2
	解全才1
	2

关键词 ：门源MS 6.9级地震, 谱比法（HVSR）, 场地效应, 地形效应, 非线性场地反应

Abstract：On January 8, 2022, an MS 6.9 earthquake occurred at Menyuan, Qinghai. Under the conditions of the same epicenter and similar path, the ground motions observed by nearby stations with a distance of 5.5 km were quite different. To explain this phenomenon, we used Nakamura method (Horizontal-to-vertical Spectra Ratio, HVSR) and Borcherdt method (Standard Spectra Ratio, SSR) respectively to analyse the influence of site effect and topography effect on ground motion based on the records of mainshock and aftershocks. A method was proposed to determine the dominant contributing frequency band of the peak ground acceleration (PGA) by moving the high-frequency cutoff frequency of bandpass filter. The reasons for the large discrepancy of PGA are preliminarily analyzed in different frequency bands by considering site effect and topography effect.

Key words： MS 6.9 Menyuan earthquake horizontal-to-vertical spectra ratio（HVSR） Site effect Topography effect Nonlinear site response

收稿日期: 2022-11-23 出版日期: 2023-11-15

引用本文:

张世亮1,2，马强1,2，陶冬旺1,2，钱亮1,2，李继龙1,2，解全才1,2. 应用邻近强震动站点主余震记录的场地及地形效应分析[J]. 振动与冲击, 2023, 42(21): 200-210.
ZHANG Shiliang1,2, MA Qiang1,2, TAO Dongwang1,2, QIAN Liang1,2, LI Jilong1,2, XIE Quancai1,2. Analysis of site and topography effects using strong motion records of the mainshock and aftershocks from nearby stations. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(21): 200-210.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I21/200

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