基于近场记录的强震台站场地波速结构反演

高凯; 刘宇实; 师黎静

doi:10.11899/zzfy20240302

基于近场记录的强震台站场地波速结构反演

doi: 10.11899/zzfy20240302

高凯^1,,
刘宇实²,
师黎静^1, ,

1.
中国地震局工程力学研究所, 地震工程与工程振动重点实验室, 哈尔滨 150080
2.
国家知识产权局专利局专利审查协作四川中心, 成都 610213

基金项目: 国家自然科学基金（51978635）；国家重点研发计划（2018YFC1504601、2018YFC1504004）

详细信息

作者简介:
高凯，男，生于1998年。硕士研究生。主要从事场地条件研究工作。E-mail：gaokai_kyle@163.com

通讯作者:
师黎静，男，生于1976年。博士后，研究员，博士生导师。主要从事工程地震研究工作。E-mail：shlj@iem.ac.cn

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- 文章访问数: 43
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- 被引次数: 0
出版历程
- 收稿日期: 2023-02-16
- 网络出版日期: 2024-10-15
- 刊出日期: 2024-09-01

Inversion of Site Velocity Structure Based on Near-field Seismic Records at Single Station

Gao Kai^1
,,
Liu Yushi²,
Shi Lijing^{1
, ,}

1.
Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China
2.
Patent Examination Cooperation Sichuan Center of the Patent Office, SIPO, Chengdu 610213, China

摘要

摘要: 基于近场加速度记录反演场地浅部速度结构，可为补充强震台站场地信息提供一种简便的途径，有利于记录的充分利用。本文详细推导了基于单一台站记录的P波地震图法，分析了其中的反演目标函数；通过数值模拟大量近场场地上的理论地震图，分析了场地覆盖层剪切波速、厚度等特征参数及震源持时对PS波与P波延时的影响，给出了地震记录的筛选原则；通过增加P波初到时刻径向分量与竖向分量幅值比函数作为反演目标函数，对单台地震图法进行改进；最后，利用汶川地震主震及余震记录，反演了武都强震台的场地波速结构，并与表面波法和钻孔法进行对比，结果表明，改进的单台地震图法搜索能力得到了增强，反演效率和精度得到显著提高。
- 剪切波速 /
- P波地震图法 /
- 强震台站 /
- 反演
Abstract: The P-wave seismogram method offers a fast and convenient approach to investigating the velocity structure at seismic stations using near-field strong aftershock records, thus maximizing the utility of these data. This method was thoroughly derived, and its inversion objective function was analyzed. Through numerical simulations of theoretical seismograms from multiple near-field sites, the impact of site characteristic parameters and seismic source duration on the delay between the PS-wave and P-wave was examined. The applicability of the seismic records was also assessed. To improve the single-station seismogram method, the amplitude ratio between the initial vertical and radial components at the first arrival of the P-wave was incorporated as an additional inversion objective function. The improved method was then applied to invert the S-wave velocity structure at the Wudu station using mainshock and aftershock records from the Wenchuan earthquake. Comparisons with the surface wave method and the borehole method demonstrate that the enhanced single-station seismogram method improved search capability, as well as inversion efficiency and accuracy.
- Shear-wave velocity /
- P-wave seismograms method /
- Seismic station /
- Inversion

HTML全文

图 1 入射P波在自由表面处的转换（Li等，2014）

Figure 1. Interaction between incident P-wave and free surface (from Li et al., 2014)

下载: 全尺寸图片幻灯片

图 2 不同震相示意图

Figure 2. Different seismic phases

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图 3 波速结构模型

Figure 3. Velocity structure model

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图 4 不同波速结构模型对应的理论地震图和U_Z/U_R随剪切波速变化情况

Figure 4. Theoretical seismograms corresponding to different velocity structure models and U_Z/U_R

下载: 全尺寸图片幻灯片

图 5 汶川地震主余震分布

Figure 5. Distribution of main shock and aftershocks of Wenchuan earthquake

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图 6 M_S 4.7余震波形图

Figure 6. M_S 4.7 aftershock records

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图 7 余震记录波形对比图

Figure 7. Comparison of aftershock recording waveforms

下载: 全尺寸图片幻灯片

图 8 不同波速基岩场地模型与PS/P幅值比

Figure 8. Site structures with different velocity V_Sbo and the radial PS/P amplitude of synthetic seismograms

下载: 全尺寸图片幻灯片

图 9 满足反演目标函数的理论地震图

Figure 9. Synthetic seismograms matching the inversion objective functions

下载: 全尺寸图片幻灯片

图 10 武都WUD台站剪切波速结构反演结果对比

Figure 10. Comparison of shear wave velocity structure inversion results at WuDu station

下载: 全尺寸图片幻灯片

图 11 不同V_S30对应的衰减关系及PGA标准差与断层距关系

Figure 11. Attenuation relationship corresponding to different V_S30 and relationship between PGA standard deviation and rupture distance

下载: 全尺寸图片幻灯片

表 1 武都台记录的地震信息

Table 1. Earthquakes information of recorded at Wudu station

发震时间	纬度/ (°N)	经度/ (°E)	震源深度/km	震级	震中距/ km
2008-07-31 13:56:03	33.3	105.1	33	3.3	15.2
2008-08-02 21:45:03	32.7	105.7	10	4.0	97.8
2008-08-31 15:24:03	32.7	105.8	10	4.1	104.4
2008-05-15 21:04:03	32.7	105.6	33	4.3	89.8
2008-05-25 17:34:03	33.0	104.9	33	4.7	37.8
2008-05-25 16:21:03	32.5	105.4	33	6.4	96.4
2008-08-05 17:49:03	32.7	105.6	10	6.5	90.9

下载: 导出CSV

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