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韩国济州岛地下水位波动中地震前兆解释的有效时域和频域技术。

Effective time- and frequency-domain techniques for interpreting seismic precursors in groundwater level fluctuations on Jeju Island, Korea.

作者信息

Hwang Hak Soo, Hamm Se-Yeong, Cheong Jae-Yeol, Lee Soo-Hyoung, Ha Kyoochul, Lee Cholwoo, Woo Nam-Chil, Yun Sul-Min, Kim Kwang-Hee

机构信息

SEKOGEO Co., Ltd., Seongnam, Gyeonggi-do, 13524, Republic of Korea.

Department of Geological Sciences, Pusan National University, Busan, 46241, Republic of Korea.

出版信息

Sci Rep. 2020 May 12;10(1):7866. doi: 10.1038/s41598-020-64586-0.

DOI:10.1038/s41598-020-64586-0
PMID:32398830
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7217890/
Abstract

An effective method, involving time and frequency domains was developed to interpret seismic precursors by comparing groundwater-level fluctuations recorded immediately and long before the occurrence of a known earthquake. The proposed method, consisting of the pre-processing (3-point filtering, band-pass filtering, and spectrum analysis) and post-processing (weighted moving average method and histogram and spectrum analyses) stages, was applied to the groundwater-level time series measured at three monitoring wells on Jeju Island, South Korea, from 00:00 on 8 September 2016 to 00:00 on 22 September 2016. The Gyeongju earthquake (Mw 5.4) occurred at 20:32 on 12 September2016. The histogram analysis exhibited an accentuating bellshape as the total number of waveforms, including those caused by the earthquake, of the groundwater-level fluctuations increased. The weighted moving average analysis indicated that various abnormal waveforms with different periods occurred in the fluctuations approaching the occurrence of the earthquake. The periods of seismic precursors in the groundwater-level fluctuations were determined by spectrum analysis and varied among the monitoring wells. Seismic precursor responses attributable to the Gyeongju earthquake were identified at least 8 hours before the earthquake, and the method used in this study indicates its good potential to predict an impending earthquake.

摘要

通过比较已知地震发生前后立即记录和长期记录的地下水位波动情况，开发了一种涉及时间和频率域的有效方法来解释地震前兆。所提出的方法包括预处理（三点滤波、带通滤波和频谱分析）和后处理（加权移动平均法以及直方图和频谱分析）阶段，并应用于2016年9月8日00:00至2016年9月22日00:00在韩国济州岛三口监测井测量的地下水位时间序列。庆州地震（Mw 5.4）于2016年9月12日20:32发生。随着包括地震引起的波动在内的地下水位波动波形总数增加，直方图分析呈现出明显的钟形。加权移动平均分析表明，在接近地震发生时的波动中出现了不同周期的各种异常波形。通过频谱分析确定了地下水位波动中地震前兆的周期，且各监测井之间有所不同。在地震发生前至少8小时识别出了归因于庆州地震的地震前兆响应，本研究中使用的方法显示出其预测即将发生地震的良好潜力。

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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7060/7217890/d94eb7ecccfb/41598_2020_64586_Fig10_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7060/7217890/b3d29b35c80a/41598_2020_64586_Fig1_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7060/7217890/79b1d13ef424/41598_2020_64586_Fig2_HTML.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7060/7217890/c3ef7f0d0f7f/41598_2020_64586_Fig4_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7060/7217890/cc65b33f6c0b/41598_2020_64586_Fig5_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7060/7217890/90620b4b8602/41598_2020_64586_Fig6_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7060/7217890/f032c8832c23/41598_2020_64586_Fig7_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7060/7217890/023543aadd5a/41598_2020_64586_Fig8_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7060/7217890/156633546d4d/41598_2020_64586_Fig9_HTML.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/7060/7217890/d94eb7ecccfb/41598_2020_64586_Fig10_HTML.jpg

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