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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/50457


    Title: Seismomagnetic Signal Comparison using the Morlet Wavelet Method
    Authors: Chen,CH;Wen,S;Liu,JY;Yeh,TK;Wang,CH;Yen,HY;Hattori,K;Lin,CR
    Contributors: 太空科學研究所
    Keywords: MAGNETIC-FIELD MEASUREMENTS;LOMA-PRIETA EARTHQUAKE;TAIWAN;SUSCEPTIBILITY;FLUCTUATIONS;TRANSFORM;EMISSIONS;EPICENTER;SWARM;JAPAN
    Date: 2011
    Issue Date: 2012-03-27 17:32:28 (UTC+8)
    Publisher: 國立中央大學
    Abstract: The Morlet wavelet transform is commonly utilized to understand amplitude distributions in the frequency domain. To compare amplitude distributions at two different stations, the wavelet coherence as a normalized numerical index is employed. The wavelet coherence at two stations away from an epicenter often approaches 1 and their relative phase presents synchronous variations suggesting that geomagnetic fields are dominated by changes in the ionosphere and/or magnetosphere. When a station located near an epicenter is added to the analytical process, the small wavelet coherence at the period of approximately 0.5 day appears and disappears suddenly 40 days before and few days after earthquakes, respectively. Analytical results are in agreement with ratio changes of daily variation ranges at two stations during earthquakes reported in previous studies and shed light on location estimation of epicenters for forthcoming events using geomagnetic intensity fields.
    Relation: DISASTER ADVANCES
    Appears in Collections:[太空科學研究所 ] 期刊論文

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