基于HVSR的DONET1海底地震动场地效应研究

周旭彤; 胡进军; 谭景阳; 崔鑫

doi:10.11899/zzfy20210111

基于HVSR的DONET1海底地震动场地效应研究

doi: 10.11899/zzfy20210111

周旭彤^{1, 2,},
胡进军^{1, 2, ,},
谭景阳^{1, 2},
崔鑫^{1, 2}

1.
中国地震局工程力学研究所，哈尔滨 150080
2.
中国地震局地震工程与工程振动重点实验室，哈尔滨 150080

基金项目: 国家重点研发计划（2017YFC1500403；2018YFC1504401）；国家自然科学基金（52078470；51578516）

详细信息

作者简介:
周旭彤，男，生于1996年。硕士研究生。主要从事海域地震动方面的研究。E-mail：iemzxt@163.com

通讯作者:
胡进军，男，生于1978年。博士，研究员，博士生导师。主要从事地震动模型和设计地震动方面的研究。E-mail：hu-jinjun@163.com

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- 文章访问数: 373
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出版历程
- 收稿日期: 2020-11-30
- 网络出版日期: 2021-07-12
- 刊出日期: 2021-03-01

The Study of Site Effect of DONET1 Offshore Ground Motions Based on HVSR

Zhou Xutong^{1, 2
,},
Hu Jinjun^{1, 2
, ,},
Tan Jingyang^{1, 2},
Cui Xin^{1, 2}

1.
Institute of Engineering Mechanics，China Earthquake Administration, Harbin 150080, China
2.
Key Laboratory of Earthquake Engineering and Engineering Vibration，China Earthquake Administration，Harbin 150080, China

摘要

摘要: 为基于谱比方法研究海底地震动场地效应，选取日本DONET1台网的20个海底台站2014—2021年记录的1634组地震数据，对其进行筛选和处理后，利用水平与竖向谱比（HVSR）方法考虑不同布设对海底5组节点台站（KMA、KMB、KMC、KMD、KME）谱比特征的影响。研究结果表明：KMA与KME节点台站具有相似的场地特征，KMB与KMD节点台站分散布置在2种场地，KMC节点台站场地与其他节点均不相似，这与长期地质调查结果相似；海底台站谱比曲线呈多峰值现象，其中KMB、KMC、KMD分组台站利用HVSR方法识别的主频变异性较高，KMA、KME分组台站主频较稳定；相同地形条件下，布设方式相同的海底台站谱比曲线随频率分布相似，海底复杂场地条件下，采用装沙沉底方式布置的台站识别场地条件时出现偏差；海底复杂因素对掩埋沉箱方式布设的台站谱比曲线的影响主要集中在频率<5 Hz的低频处；海底复杂因素对未埋入海底台站谱比曲线的影响主要集中在频率为5—10 Hz的高频处。研究结果可为海底地震动场地效应研究提供参考。
- 海底地震动 /
- 水平与竖向谱比（HVSR） /
- 场地效应 /
- 地震台网
Abstract: For study the site effect, a group of 20 stations in the DONET1 network, which was used for earthquake and tsunami warning, have been deployed on the seafloor as large earthquakes of magnitude continue occur in offshore around the world and cause serious secondary disasters. In this paper, based on the 1634 group offshore ground motion data recorded by 20 offshore stations (4 stations in a group named KMA, KMB, KMC, KMD, KME) in the DONET1 network, the spectral ratio characteristics of offshore stations were studied by HVSR method after data processing. The results shows: (1) The stations in the KMA and KME groups may be located in the same geological state on the seafloor, and the stations in the KMB and KMD groups may be distributed in two different geological states on the seafloor. The stations in the KMC group are different from those in the previous geological state, which is similar to the results of long-term geological survey. (2) The spectral ratio curves with multiple peaks, and with large variation coefficient of dominant frequency for offshore stations. (3) The HVSR curves of offshore stations with the same buried conditions and topographic condition have good consistency. In complex seafloor, site buried with sand conditions is deviated due to the influence of caisson sand filling when identification of site conditions use spectral ratio method. The influence of complex seafloor factors on the HVSR curve of stations with buried caisson is mainly at the low frequency of less than 5 Hz.The influence of complex seafloor factors on the HVSR curves of unburied offshore stations is mainly concentrated on the high frequency range of 5—10 Hz.The results can provide a reference for the study of the site effect of offshore ground motion.
- Offshore ground motion /
- HVSR /
- Site effect /
- Seismic network

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图 1 共振频率识别方法的对比

Figure 1. Comparison of resonance frequency identification methods

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图 2 海底台站布设

Figure 2. Embedment condition of offshore stations

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图 3 海底台站及地震事件分布

Figure 3. Distribution of offshore stations and earthquake events

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图 4 海底地震动数据处理

Figure 4. Processing of records of offshore ground motion

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图 5 海底地震动S波数据处理

Figure 5. Processing S wave for offshore ground motion

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图 6 平滑效果对比

Figure 6. Smoothing effect comparison of different smooth windows for KMC11 stations

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图 7 HVSR谱比结果

Figure 7. The results of HVSR at offshore stations in DONET1

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图 8 海底台站主频和变异系数分布

Figure 8. Distribution of dominant frequency and variable coefficient for offshore stations

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图 9 海底台站HVSR幅值

Figure 9. HVSR amplitude for offshore stations

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图 10 DONET1海底台站按地形分组分布

Figure 10. The DONET1offshore stations grouped by topography

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图 11 不同区域谱比曲线对比

Figure 11. Comparison of H/V curves in different regions

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图 12 布设方式对HVSR幅值的影响

Figure 12. The effect of embedment condition on the amplitude of HVSR

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表 1 DONET1台网海底台站信息（Kaneda等，2015）

Table 1. The information of DONET1 offshore sites（Kaneda et al，2015）

布设方式	台站命名	纬度/°	经度/°	海水深度/m	记录数量
掩埋沉箱	KMA01	N33.805	E136.557	2 039	96
装沙沉底	KMA02	N33.752	E136.649	2 011	107
装沙沉底	KMA03	N33.648	E136.604	2 063	78
装沙沉底	KMA04	N33.678	E136.467	2 054	82
掩埋沉箱	KMB05	N33.477	E136.926	1 998	83
装沙沉底	KMB06	N33.358	E136.922	2 499	95
掩埋沉箱	KMB07	N33.361	E136.807	1 980	101
掩埋沉箱	KMB08	N33.466	E136.804	1 924	101
掩埋沉箱	KMC09	N33.058	E136.831	3 511	100
未埋	KMC10	N33.053	E136.933	4 247	123
未埋	KMC11	N33.003	E136.779	4 378	122
掩埋沉箱	KMC12	N33.128	E136.819	3 784	114
掩埋沉箱	KMD13	N33.220	E136.690	2 441	88
掩埋沉箱	KMD14	N33.173	E136.577	2 350	89
掩埋沉箱	KMD15	N33.233	E136.563	1 909	76
掩埋沉箱	KMD16	N33.305	E136.596	1 970	95
装沙沉底	KME17	N33.485	E136.445	2 054	20
装沙沉底	KME18	N33.386	E136.383	2 052	23
掩埋沉箱	KME19	N33.446	E136.256	1 909	20
掩埋沉箱	KME20	N33.544	E136.332	1 977	21

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