Magnetic storm free ULF analysis in relation with earthquakes in Taiwan

NCUIR > College of Earth Sciences > DEPARTMENT OF SPACE SCIENCE AND ENGINEERING > journal & Dissertation > Item 987654321/102248

Please use this identifier to cite or link to this item: https://ir.lib.ncu.edu.tw/handle/987654321/102248

Title:	Magnetic storm free ULF analysis in relation with earthquakes in Taiwan
Authors:	劉正彥;Wen, S.;Chen, C.-H.;Yen, H.-Y.;Yeh, T.-K.;Liu, J.-Y.;Hattori, K.;Peng, H.;Wang, C.-H.;Shin, T.-C.
Contributors:	地球科學學院太空科學與工程學系
Keywords:	Analysis;Earthquakes;Fourier transforms;Ionosphere;Magnetic anomalies;Magnetic storms;Seismic activity;Seismology;Solar activity;Storms
Date:	2012-06-01
Issue Date:	2026-04-23 11:04:56 (UTC+8)
Publisher:	European Geosciences Union;Katlenburg-Lindau: Copernicus Publications
Abstract:	摘要： Despite early optimism, pre-earthquake anomalous phenomena can be determined by using enhanced amplitude at the ultra-low-frequency range from geomagnetic data via the Fourier transform. In reality, accuracy of the enhanced amplitude in relation to earthquakes (deduced from time-varied geomagnetic data) would be damaged by magnetic storms and/or other unwanted influences resulting from solar activity and/or variations in the ionosphere, respectively. We substitute values of the cross correlation between amplitudes, summarized from the earthquake-related (0.1–0.01 Hz) and the comparable (0.01–0.001 Hz) frequency bands, for isolated amplitude enhancements as indexes of determination associated with seismo-magnetic anomalies to mitigate disturbance caused by magnetic storms. A station located about 300 km away from the others is also taken into account to further examine whether changes of the cross correlation values are caused by seismo-magnetic anomalies limited within local regions or not. Analytical results show that the values suddenly decrease near epicenters a few days before and after 67% (= 6/9) of earthquakes ( M > = 5) in Taiwan between September 2010 and March 2011. Seismo-magnetic signals determined by using the values of cross correlation methods partially improve results yielded from the Fourier transform alone and provide advantageous information of earthquake locations. 出版者： Katlenburg-Lindau: Copernicus Publications 出版日期： 2012-05-25 出處： Natural hazards and earth system sciences, 2012-05, Vol.12 (5), p.1747-1754 資源來源： Agricultural & Environmental Science Collection 版權： COPYRIGHT 2012 Copernicus GmbH 版權： Copyright Copernicus GmbH 2012 識別號： ISSN: 1684-9981 識別號： ISSN: 1561-8633 識別號： EISSN: 1684-9981 識別號： DOI: 10.5194/nhess-12-1747-2012
Appears in Collections:	[DEPARTMENT OF SPACE SCIENCE AND ENGINEERING] journal & Dissertation

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