A Fast Aftershock Monitoring Network With DAS and Internet Fiber-Optic Cable in Tangshan, China
The aftershock provides valuable information on rupture zone, stress change, triggering etc. Since the aftershock number rapidly decays after the mainshock according to the Omori-Utsu law, it is better to deploy monitoring networks as soon as possible. Distributed Acoustic Sensing can turn the internet fiber-optic cable into dense seismic network with small cost in a short time. A 7.6-km long DAS array was deployed after the 12 July, 2020 Tangshan Ms5.1 earthquake, which is the strongest earthquake in Beijing surrounding region since 2006. During the seven-days deployment, most aftershocks in CENC catalog were recorded by the DAS array while dozens new events were detected by eye-scan. The high-quality waveform makes it possible to pick arrivals of P and S waves, which were used to locate several aftershocks. Our study also suggests that the small aperture of DAS array introduce large location uncertainty. Besides event detection and location, the ground-motion duration is also be obtained in real time. However, the various coupling of fiber-optic cable strongly dominates amplitude that leads difficulties in magnitude estimation. In summary, combining DAS technology and existing internet fiber-optic cable make it possible to deploy dense seismic monitoring network in short time and provides useful information for event detection, location, and strong-motion studies.
Presenting Author: Xiangfang Zeng
Student Presenter: No
Day: 4/23/2021
Time: 2:00 PM - 3:15 PM Pacific
Additional Authors
Xiangfang Zeng Presenting Author Corresponding Author zengxf@whigg.ac.cn Innovation Academy for Precision Measurement Science and Technology, CAS |
Feng Bao baofeng@whigg.ac.cn State Kay Laboratory of Geodesy and Earth’s Dynamics, Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences |
Rongbin Lin robin_lin@163.com State Kay Laboratory of Geodesy and Earth’s Dynamics, Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences |
Shuofan Wang wangshuofan@whigg.ac.cn State Kay Laboratory of Geodesy and Earth’s Dynamics, Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences |
Hao Lv lh17@mail.ustc.edu.cn State Kay Laboratory of Geodesy and Earth’s Dynamics, Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences |
Zhenghong Song zhhsong6@mail.ustc.edu.cn State Kay Laboratory of Geodesy and Earth’s Dynamics, Academy of Precision Measurement Science and Technology, Chinese Academy of Sciences |
|
|
|
A Fast Aftershock Monitoring Network With DAS and Internet Fiber-Optic Cable in Tangshan, China
Category
Fiber-optic Seismology
Description