The December 26, 2004, tsunami on Sumatra Island as a source of internal gravity waves in the earth’s atmosphere

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• 作者：G. A. Mikhailova ; Yu. M. Mikhailov ; O. V. Kapustina
• 刊名：Geomagnetism and Aeronomy
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：56
• 期：5
• 页码：634-640
• 全文大小：680 KB
• 刊物主题：Geophysics/Geodesy;
• 出版者：Springer US
• ISSN：1555-645X
• 卷排序：56

文摘

Records of the coastal mareographs during the December 26, 2004, tsunami are used to study the fine structure of the tsunami wave power spectra. It is shown that a series of maxima is observed in their spectra near the source in a range of internal gravity wave frequencies of 0.2–1.2 mHz, which coincides with the frequencies of the natural oscillations of the Earth. This experimental finding enables us to propose a possible physical mechanism for the formation of tsunami waves as a result of oscillations in the sea bottom at these frequencies. Internal gravity waves in the Earth’s atmosphere excited in this way are found in the variations of the total electron content that resulted from this powerful earthquake.