地脉动水平/竖向谱比表征地震动场地效应的有效性及其修正

段建斌; 王玉石; 王立新; 王宁; 张立宝; 丁毅

doi:10.11899/zzfy20230314

地脉动水平/竖向谱比表征地震动场地效应的有效性及其修正

doi: 10.11899/zzfy20230314

段建斌^1,,
王玉石^{2, 3, ,},
王立新⁴,
王宁¹,
张立宝¹,
丁毅^{2, 3}

1.
中国地震局地球物理研究所, 北京100081
2.
北京工业大学，城市与工程安全减灾教育部重点实验室, 北京100124
3.
北京工业大学，工程抗震与结构诊治北京市重点实验室, 北京100124
4.
深圳防灾减灾技术研究院, 广东深圳518003

基金项目: 国家重点研发计划（2019YFC1511004）；国家自然科学基金重点项目（52192675、U1839202）

详细信息

作者简介:
段建斌，男，生于1994年。硕士研究生。主要从事场地效应研究。E-mail:duanjianbin19@mails.ucas.ac.cn

通讯作者:
王玉石，男，生于1982年。博士，副研究员，硕士生导师。主要从事地震动场地效应与强震动观测技术研究。E-mail：wangyushi1982@126.com

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出版历程
- 收稿日期: 2022-02-15
- 刊出日期: 2023-08-31

Validity Verification and Correction Method of Horizontal and Vertical Spectrum Ratio Method of Microtremor in Site Effect Study

Duan Jianbin^1
,,
Wang Yushi^{2, 3
, ,},
Wang Lixin⁴,
Wang Ning¹,
Zhang Libao¹,
Ding Yi^{2, 3}

1.
Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2.
Key Laboratory of Urban Security and Disaster Engineering of China Ministry of Education, Beijing University of Technology, Beijing 100124, China
3.
Key Laboratory of Earthquake Engineering and Structural Retrofit of Beijing, Beijing University of Technology,Beijing 100124, China
4.
Shenzhen Academy of Disaster Prevention and Reduction, Shenzhen 518003, Guangdong, China

摘要

摘要: 近年来，地脉动水平/竖向谱比法广泛应用于获取场地卓越频率工作中，但在指示地震动放大系数方面是偏小的。利用KiK-net台网403个台站共21万余组数据，通过对比分析地脉动水平/竖向谱比MHVR和地震动水平/竖向谱比EHVR，发现二者的谱形和峰值频率基本一致，但幅值存在差异。根据MHVR谱形将场地分为6类，建立将MHVR修正为EHVR的经验方法。当MHVR有可解释的峰值时，实测EHVR和修正后MHVR预测值一致性提高。地震动峰值加速度在40 cm/s²以下时，EHVR受场地非线性的影响较小，利用MHVR及其修正方法可有效估计EHVR。
- 强震动 /
- 场地效应 /
- 地脉动 /
- 水平/竖向谱比
Abstract: In recent years, the horizontal/vertical spectrum ratio method of microtremor has been widely used to obtain the site dominant frequency, but it is usually too small to indicate the amplification coefficient of ground motion. Based on more than 210,000 sets of data from 403 stations of KiK-net, the horizontal/vertical spectrum ratio of microtremor (MHVR) and horizontal/vertical spectrum ratio of earthquake ground motion (EHVR) are compared and analyzed. It is found that the spectrum shape and peak frequency of the two are consistent, but the amplitude is different. According to the MHVR spectrum, the site was divided into six categories, and an empirical method was established to modify MHVR into EHVR. When MHVR has an interpretable peak value, the consistency between the measured EHVR and the revised MHVR predicted value is significantly improved. When the peak acceleration of ground motion is less than 40 cm/s², EHVR is less affected by site nonlinearity. Therefore, MHVR and its correction method could be used to estimate EHVR effectively.
- Strong ground motion /
- Site effect /
- Microtremor /
- Horizontal/Vertical spectrum ratio

HTML全文

图 1 强震记录三分量波段划分

Figure 1. Three component division bands of strong earthquake record

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图 2 不同记录时长地脉动H/V谱

Figure 2. Microtremor H/V spectra for different lengths

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图 3 地脉动H/V谱比曲线稳定所需时长

Figure 3. The stabilization time of microtremor H/V different frequency points

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图 4 地震记录S波段、P波段、尾波段、全波段和地脉动H/V谱比较

Figure 4. Comparison of H/V spectra of S waves, P waves, coda, full waves and microtremors

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图 5 地脉动H/V谱峰值清晰性检验示意

Figure 5. Microtremor H/V peak clarity test diagram

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图 6 综合考虑谱形差异和卓越频率差异的经验修正系数

Figure 6. Empirical correction coefficient based on spectral shape differences and predominant frequency differences

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图 7 MHVR、EHVR与pHVR比较

Figure 7. Comparison of microtremor H/V, measured earthquake H/V and predicted earthquake H/V

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图 8 不同条件下的准确度比较

Figure 8. Comparison of accuracy under different conditions

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