Statistical analysis of ULF seismomagnetic phenomena at Kakioka, Japan, during 2001-2010

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Title:	Statistical analysis of ULF seismomagnetic phenomena at Kakioka, Japan, during 2001-2010
Authors:	劉正彥;Han, Peng;Hattori, Katsumi;Hirokawa, Maiko;Zhuang, Jiancang;Chen, Chieh-Hung;Febriani, Febty;Yamaguchi, Hiroki;Yoshino, Chie;Liu, Jann-Yenq;Yoshida, Shuji
Contributors:	地球科學學院太空科學與工程學系
Keywords:	Earthquake forecasting;Earthquake prediction;Earthquakes;Extremely low frequencies;Geomagnetic anomalies;Geomagnetic data;Geomagnetism;Geophysics;Magnetic anomalies;Molchan's error diagram;Precursors;Seismic activity;Seismology;Statistical analysis;statistical study;superposed epoch analysis (SEA);ULF seismo-magnetic phenomena;Wavelet analysis;wavelet transform analysis;Wavelet transforms
Date:	2014-01-01
Issue Date:	2026-04-23 11:06:12 (UTC+8)
Publisher:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
Abstract:	摘要： AbstractTo clarify and verify the ultralow frequency (ULF) seismomagnetic phenomena, we have performed statistical studies on the geomagnetic data observed at the Kakioka (KAK) station, Japan, during 2001–2010. We investigated the energy of ULF geomagnetic signals of the frequency around 0.01 Hz using wavelet transform analysis. To minimize the influences of artificial noises and global geomagnetic perturbations, we used only the geomagnetic data observed at nighttime (LT 2:30 A.M. to 4:00 A.M.) and utilized observations from a remote station, Kanoya, as a reference. Statistical results of superposed epoch analysis have indicated that ULF magnetic anomalies are more likely to appear before sizable earthquake events (Es > 108) rather than after them, especially 6–15 days before the events. Further statistical investigations show clearly that the ULF geomagnetic anomalies at KAK station are more sensitive to larger and closer events. Finally, we have evaluated the precursory information of ULF geomagnetic signals for local sizable earthquakes using Molchan's error diagram. The probability gain is around 1.6 against a Poisson model. The above results have indicated that the ULF seismomagnetic phenomena at KAK clearly contain precursory information and have a possibility of improving the forecasting of large earthquakes. 其他題名： J. Geophys. Res. Space Physics 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2014-06 出處： Journal of Geophysical Research: Space Physics, 2014-06, Vol.119 (6), p.4998-5011 資源來源： Wiley Online Library 版權： 2014. American Geophysical Union. All Rights Reserved. 識別號： ISSN: 2169-9380 識別號： ISSN: 2169-9402 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/2014JA019789
Appears in Collections:	[DEPARTMENT OF SPACE SCIENCE AND ENGINEERING] journal & Dissertation

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