Excitation of Basin-Wide Modes of the Pacific Ocean Following the March 2011 Tohoku Tsunami

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Title:	Excitation of Basin-Wide Modes of the Pacific Ocean Following the March 2011 Tohoku Tsunami
Authors:	佐竹健治;Heidarzadeh, Mohammad;Satake, Kenji
Contributors:	地球科學學院地球科學學系
Keywords:	Basins;Bathymetry;Earth and Environmental Science;Earth Sciences;Earthquakes;Excitation;Excitation spectra;Gauges;Geophysics/Geodesy;Mathematical analysis;Ocean currents;Oscillations;Pacific Ocean;Seismic activity;Spectra;Spectral analysis;Stations;Tsunamis
Date:	2014-12-02
Issue Date:	2026-04-23 11:33:38 (UTC+8)
Publisher:	Birkhauser Verlag Basel;Basel: Springer Science and Business Media LLC
Abstract:	摘要： This study is an attempt towards understanding the sources of long oscillations observed within the Pacific Ocean following the 11 March 2011 Tohoku earthquake. We present evidence that extremely long modes of the Pacific Ocean in the range of 2–48 h were excited by this giant tsunami. A numerical approach was employed to calculate the basin-wide modes of the Pacific Ocean, resulting in 49 modes in the range of 2–48 h. We studied 15 tide-gauge records around the Pacific Ocean in order to extract basin-wide modes of the Pacific Ocean excited by this transoceanic tsunami. Spectral analysis of these tide-gauge records showed that some of the calculated basin-wide modes were indeed excited by the Tohoku tsunami. The observed modes ranged from 2 to 49.8 h. We attributed the long oscillations of the Pacific Ocean during the 2011 Tohoku tsunami to the excitation of these basin-wide modes, which can be grouped into global modes (15–48 h) and regional modes (2–15 h). We classified the signals on the tide gauges into three groups: (1) basin-wide modes (>1.5 h), (2) the tsunami source periods (20–90 min), and (3) local bathymetric effects (<20 min). The average contributions to the total tsunami energy were 6.4 % for the basin-wide mode, 64.1 % for the tsunami source, and 29.5 % for the local bathymetry, although the ratios varied from station to station. Simulations suggest that the amount of contribution of basin effects to the total tsunami energy depends on the location of the tsunami source. 其他題名： Pure Appl. Geophys 出版者： Basel: Springer Science and Business Media LLC 出版日期： 2014-12-01 出處： Pure and Applied Geophysics, 2014-12, Vol.171 (12), p.3405-3419 資源來源： Springer Nature Journals - AutoHoldings 版權： Springer Basel 2013 版權： Springer Basel 2014 識別號： ISSN: 0033-4553 識別號： ISSN: 1420-9136 識別號： ISSN: 0033-4533 識別號： EISSN: 1420-9136 識別號： DOI: 10.1007/s00024-013-0731-5
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