唐山北部地区浅层一维剪切波速度结构初步研究

王莉婵; 毛国良; 蔡玲玲; 马旭东; 王亚玲; 王宁

doi:10.11899/zzfy20220111

唐山北部地区浅层一维剪切波速度结构初步研究

doi: 10.11899/zzfy20220111

河北省地震局, 石家庄 050021

基金项目: 中国地震局地震监测、预测、科研三结合课题（3JH-202001014）

详细信息

作者简介:
王莉婵，女，生于1988年。硕士，工程师。主要从事地震监测方面的工作。E-mail：wlc84872583@163.com

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出版历程
- 收稿日期: 2021-01-22
- 网络出版日期: 2022-05-31
- 刊出日期: 2022-03-31

Preliminary Study on One-dimensional Shear Wave Velocity Structure of the Shallow Crust in Northern Tangshan Area

Hebei Earthquake Agency, Shijiazhuang 050021, China

摘要

摘要: 2019年8月2日河北省唐山市路南区某矿井区发生M_L2.4巷道塌陷，基于塌陷周边台站观测到的短周期瑞雷波，提取面波基阶群速度频散曲线，并利用迭代反演方法得到研究区域地下10 km深度范围内的一维剪切波速度结构，用于精定位分析。速度分析结果表明，研究区域浅表剪切波速度约为2.46 km/s；深度为2 km时，塌陷周边存在小范围的低速区，速度约为2.57 km/s；深度约为4 km时，剪切波速度达3.47 km/s；深度为5～9 km时，唐山东部沉积盆地内存在1个剪切波低速层。精定位分析结果表明，增加浅层速度模型有助于提高深度较小的地震定位精度；塌陷周边的低速区向下延伸近20 km，为地震多发区。
- 塌陷 /
- 面波频散 /
- 剪切波 /
- 速度结构 /
- 精定位
Abstract: On August 2, 2019, a M_L2.4 mine laneway collapse occurred in the Lunan district of Tangshan, Hebei province. In this paper, we extracted the fundamental dispersion curve based on the short-period Rayleigh waves observed at the stations around the collapse, and then got the one-dimensional S-wave velocity structure within 10 km in the northern area of Tangshan by iterative inversion method, which can be used for precise location analysis. The result of the velocity analysis shows that the shallow S-wave velocity in the northern part of Tangshan is about 2.46 km/s; when the depth is 2 km, there is a small range of low-velocity area around the collapse, and the velocity is about 2.57 km/s; when the depth is 4 km, the shear wave velocity reaches 3.47 km/s; when the depth is 5-9km, there is a low velocity layer of S wave in the eastern Tangshan sedimentary basin. The result of precise location analysis shows that the addition of shallow velocity model is helpful to improve the accuracy of seismic location in shallow depth, and the earthquake prone area is the low-velocity area which arounds the collapse extending down nearly 20 km.
- Collapse /
- Dispersion of surface wave /
- Shear wave /
- Velocity structure /
- Seismic relocation

HTML全文

图 1 震中及部分台站波形

Figure 1. Epicenter of Tangshan collapse and seismic waveforms of some station

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图 2 CLI台站3分量波形

Figure 2. Waveforms of three components of the CLI station

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图 3 面波频谱分析

Figure 3. Frequency spectrum analysis of surface waves

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图 4 滤波前后对比图

Figure 4. Comparison of the waveforms before and after filtering

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图 5 初始速度模型

Figure 5. Initial velocity model

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图 6 提取的频散曲线

Figure 6. The extracted dispersion curves

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图 7 台站分布

Figure 7. Stations distribution map

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图 8 9个台站频散曲线与反演速度结构

Figure 8. Dispersion curves extracted from 9 stations and the velocity structure of each station obtained by inversion

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图 9 双差定位结果对比

Figure 9. Comparison of double difference positioning results

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图 10 单台与区域 S 波速度结构

Figure 10. The singal station and regional S-wave velocity structures

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