冀战波^1,2,,
王宝善^1,3,,
1. 中国地震局地球物理研究所, 北京 100081
2. 北京大学地球与空间科学学院, 北京 100871
3. 中国科学技术大学地球与空间科学学院, 合肥 230026

基金项目: 中国地质科学院基本科研业务费项目（202015）和国家自然科学基金项目（41790462）资助


详细信息

作者简介: 冀战波, 男, 1987年生, 博士研究生, 主要从事人工震源研究.E-mail:jizhanbo2008@126.com

通讯作者: 王宝善, 男, 1976年生, 教授, 博士生导师, 主要从事波速变化和主动源探测技术研究.E-mail:bwgeo@ustc.edu.cn

中图分类号: P315

收稿日期:2019-07-11
修回日期:2020-07-21
上线日期:2020-11-05

Analysis and application of multiple-mode surface waves from the August 12, 2015 Tianjin chemical explosion

JI ZhanBo^1,2,,
WANG BaoShan^1,3,,
1. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China
2. School of Earth and Space Sciences, Peking University, Beijing 100871, China
3. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China


More Information

Corresponding author: WANG BaoShan,E-mail:bwgeo@ustc.edu.cn

MSC: P315

--> Received Date: 11 July 2019
Revised Date: 21 July 2020
Available Online: 05 November 2020


摘要
摘要:2015年8月12日天津滨海新区发生的强烈化学品爆炸造成了巨大的经济损失和社会影响.天津爆炸产生了清晰的大振幅面波信号，分析结果表明这组信号由基阶和高阶面波组成，可以追踪到约135 km外的远处台站.利用这组面波信号分别开展了以下研究：（1）利用附近三个台站记录的四个单频基阶Rayleigh波信号对爆破事件的绝对位置进行了网格搜索，结果与利用GPS测量的位置相差仅0.498 km；（2）分别利用网格搜索和主事件定位法，对两次子事件的相对位置进行了确定，距离约75 m左右，与前人研究结果吻合；（3）从面波记录中测量到36条基阶Rayleigh波、49条第一高阶Rayleigh波、9条基阶Love波和29条第一高阶Love波的频散曲线，并进一步反演获得研究区域地下4 km内的S波速度结构.反演结果显示地表处S波速度低至0.375 km·s^-1，在小于1 km的浅地表速度梯度较大，符合典型的盆地结构特征.本文的研究结果为类似爆炸等突发事件快速定位提供了新的思路，有助于灾后救援的迅速展开；同时得到天津滨海新区及周边浅层精细的速度结构，对于地震灾害评估有很大帮助.
关键词: 天津爆炸/
多模式面波/
重定位/
反演/
速度结构

Abstract:On August 12, 2015, a great chemical explosion occurred in the Tianjin Binhai New Area, resulting in tremendous economic losses and social impact. This explosion produced clear large amplitude surface wave phase. Analysis shows that these signals consist of fundamental and higher-mode surface waves and can be traced about 135 km away. Using these surface wave signals, the absolute location of the explosion event is searched in terms of four frequencies fundamental Rayleigh wave signals of three nearby stations, and the difference between our result and that measured by GPS is only 0.498 km. The relative location of the two sub-events are determined by using grid search and main event location methods, respectively. The difference is about 75 meters, which is consistent with the previous research results. The dispersion curves of 36 fundamental mode Rayleigh waves, 49 first higher mode Rayleigh waves, 9 fundamental mode Love waves and 29 first higher mode Love waves are measured based on surface wave records, and the S-wave velocity structure from the surface down to depth of 4 km is obtained by further inversion. The inversion results show that the S-wave velocity at the surface is as low as 0.375 km·s^-1, and the velocity gradient at shallow depths (< 1 km) is relatively large, which conforms to the typical basin structure characteristics. This paper provides a new idea for rapid locating of similar explosions and other emergencies, which would be helpful for the rapid post-disaster rescue. It is also very helpful for earthquake hazard assessment by obtaining the fine velocity structure in shallow layers of the Tianjin Binhai New Area and surrounding areas.
Key words:Tianjin explosion/
Multiple-mode surface waves/
Relocation/
Inversion/
Velocity structure



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