Anomalous Variation in GPS TEC, Land and Ocean Parameters Prior to 3 Earthquakes

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• 作者：Kunvar Yadav ; Sheetal P. Karia ; Kamlesh N. Pathak
• 关键词：Keywordtotal electron content ; sea surface temperature ; surface latent heat flux ; earthquake
• 刊名：Acta Geophysica
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：64
• 期：1
• 页码：43-60
• 全文大小：699KB
• 刊物主题：Geophysics/Geodesy; Structural Geology; Geotechnical Engineering & Applied Earth Sciences;
• 出版者：Springer International Publishing
• ISSN：1895-7455
• 卷排序：64

文摘

The present study reports the analysis of GPS TEC prior to 3 earthquakes (M > 6.0). The earthquakes are: (1) Loyalty Island (22°36′S, 170°54′E) on 19 January 2009 (M = 6.6), (2) Samoa Island (15°29′S, 172°5′W) on 30 August 2009 (M = 6.6), and (3) Tohoku (38°19′N, 142°22′E) on 11 March 2011 (M = 9.0). In an effort to search for a precursory signature we analysed the land and ocean parameters prior to the earthquakes, namely SLHF (Land) and SST (Ocean). The GPS TEC data indicate an anomalous behaviour from 1–13 days prior to earthquakes. The main purpose of this study was to explore and demonstrate the possibility of any changes in TEC, SST, and SLHF before, during and after the earthquakes which occurred near or beneath an ocean. This study may lead to better understanding of response of land, ocean, and ionosphere parameters prior to seismic activities.