Identifications and removal of diurnal and semidiurnal variations in radon time series data of Hsinhua monitoring station in SW Taiwan using singular spectrum analysis

Over the past three decades, anomalous temporal changes in radon concentrations have been reported in relation to earthquake occurrences. However, radon anomalies in all cases are not only controlled by seismic activity, but also by meteorological parameters which make isolation of earthquake precur...

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Bibliographic Details
Published in:Natural hazards (Dordrecht) 2015-10, Vol.79 (1), p.317-330
Main Authors: Kumar, Arvind, Walia, Vivek, Arora, Baldev Raj, Yang, Tsanyao Frank, Lin, Shih-Jung, Fu, Ching-Chou, Chen, Cheng-Hong, Wen, Kuo-Liang
Format: Article
Language:English
Subjects:
Civil Engineering
Correlation
Earth and Environmental Science
Earth Sciences
Environmental Management
Environmental monitoring
Geophysics/Geodesy
Geotechnical Engineering & Applied Earth Sciences
Hydrogeology
Meteorology
Monitoring
Natural Hazards
Original Paper
Radon
Radon levels
Soil (material)
Spectrum analysis
Stations
Temporal logic
Time series
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Summary:Over the past three decades, anomalous temporal changes in radon concentrations have been reported in relation to earthquake occurrences. However, radon anomalies in all cases are not only controlled by seismic activity, but also by meteorological parameters which make isolation of earthquake precursory signals complicated. In the present study, characteristics of temporal variability of soil gas radon concentrations at the Hsinhua monitoring station, southern Taiwan, have been examined using singular spectrum analysis (SSA). In order to make continuity and regularity of the data before applying the SSA, the radon data were carefully edited for gaps and discontinuous jumps following intervals of malfunctioning of equipments. Digital filter has been applied in eliminating the long-term trend in the data and retains variations of
ISSN:0921-030X
1573-0840
DOI:10.1007/s11069-015-1844-1