Non-linear analysis of soil 222Rn time series recorded at Jiaosi in north-east Taiwan for possible earthquake precursor study

IF 2.8 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Environmental Earth Sciences Pub Date : 2025-01-20 DOI:10.1007/s12665-025-12100-y

Saheli Chowdhury, Vivek Walia, Shih-Jung Lin, Ching-Chou Fu, Hsaio-Fen Lee

引用次数: 0

Abstract

A nonlinear technique was used to analyse soil radon concentrations measured over a year and four months in Jiaosi, northeast Taiwan, to find precursory signals for regional earthquakes. The recorded data demonstrated that numerous meteorological and geophysical parameters influence radon gas emission from the soil, resulting in a complex soil radon time series. Empirical Mode Decomposition (EMD) was used to remove periodic factor components before applying the Hilbert-Huang Transform (HHT) to find pre-seismic anomalies. The discovered anomalous variations were associated with regional earthquakes of magnitude 5 or more that occurred within 100 km of the monitoring site. The effect of precipitation on soil radon emissions has also been discussed. The results show that the adopted technique can be used to analyse radon concentrations in soil gas for the prediction studies of regional earthquakes.

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台湾东北胶寺土壤222Rn时间序列的非线性分析及其地震前兆研究

一种非线性技术被用于分析台湾东北部胶寺一年零四个月的土壤氡浓度，以寻找区域地震的前兆信号。实测数据表明，土壤氡气排放受到众多气象和地球物理参数的影响，形成了复杂的土壤氡时间序列。利用经验模态分解（EMD）去除周期因子分量，然后应用Hilbert-Huang变换（HHT）寻找震前异常。发现的异常变化与发生在监测点100公里范围内的5级或以上的区域性地震有关。本文还讨论了降水对土壤氡排放的影响。结果表明，所采用的方法可用于分析土壤气体中氡的浓度，用于区域地震预报研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Environmental Earth Sciences 环境科学-地球科学综合

CiteScore

5.10

自引率

3.60%

发文量

494

审稿时长

8.3 months

期刊介绍： Environmental Earth Sciences is an international multidisciplinary journal concerned with all aspects of interaction between humans, natural resources, ecosystems, special climates or unique geographic zones, and the earth: Water and soil contamination caused by waste management and disposal practices Environmental problems associated with transportation by land, air, or water Geological processes that may impact biosystems or humans Man-made or naturally occurring geological or hydrological hazards Environmental problems associated with the recovery of materials from the earth Environmental problems caused by extraction of minerals, coal, and ores, as well as oil and gas, water and alternative energy sources Environmental impacts of exploration and recultivation – Environmental impacts of hazardous materials Management of environmental data and information in data banks and information systems Dissemination of knowledge on techniques, methods, approaches and experiences to improve and remediate the environment In pursuit of these topics, the geoscientific disciplines are invited to contribute their knowledge and experience. Major disciplines include: hydrogeology, hydrochemistry, geochemistry, geophysics, engineering geology, remediation science, natural resources management, environmental climatology and biota, environmental geography, soil science and geomicrobiology.