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Ray Tracing for Dispersive Tsunamis and Source Amplitude Estimation Based on Green’s Law: Application to the 2015 Volcanic Tsunami Earthquake Near Torishima, South of Japan

Sandanbata, Osamu ; Watada, Shingo ; Satake, Kenji ; Fukao, Yoshio ; Sugioka, Hiroko ; Ito, Aki ; Shiobara, Hajime

Pure and applied geophysics, 2018-04, Vol.175 (4), p.1371-1385 [Periódico revisado por pares]

Cham: Springer International Publishing

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Título:
Ray Tracing for Dispersive Tsunamis and Source Amplitude Estimation Based on Green’s Law: Application to the 2015 Volcanic Tsunami Earthquake Near Torishima, South of Japan
Autor: Sandanbata, Osamu ; Watada, Shingo ; Satake, Kenji ; Fukao, Yoshio ; Sugioka, Hiroko ; Ito, Aki ; Shiobara, Hajime
Assuntos: Amplitude ; Angle of arrival ; Bathymetry ; Bottom pressure ; Conservation ; Data processing ; Earth and Environmental Science ; Earth Sciences ; Earthquakes ; Energy conservation ; Energy conservation law ; Energy flux ; Energy transfer ; Frequency dependence ; Gauges ; Geophysics/Geodesy ; Iterative algorithms ; Mathematical models ; Measuring instruments ; Ocean bottom ; Ocean floor ; Oceans ; P-waves ; Pressure gages ; Pressure gauges ; Ray paths ; Ray tracing ; Seismic activity ; Seismic waves ; Shallow water ; Submarine volcanoes ; Travel time ; Tsunamis ; Volcanic activity ; Volcanoes ; Water waves ; Wave propagation ; Waveforms
É parte de: Pure and applied geophysics, 2018-04, Vol.175 (4), p.1371-1385
Descrição: Ray tracing, which has been widely used for seismic waves, was also applied to tsunamis to examine the bathymetry effects during propagation, but it was limited to linear shallow-water waves. Green’s law, which is based on the conservation of energy flux, has been used to estimate tsunami amplitude on ray paths. In this study, we first propose a new ray tracing method extended to dispersive tsunamis. By using an iterative algorithm to map two-dimensional tsunami velocity fields at different frequencies, ray paths at each frequency can be traced. We then show that Green’s law is valid only outside the source region and that extension of Green’s law is needed for source amplitude estimation. As an application example, we analyzed tsunami waves generated by an earthquake that occurred at a submarine volcano, Smith Caldera, near Torishima, Japan, in 2015. The ray-tracing results reveal that the ray paths are very dependent on its frequency, particularly at deep oceans. The validity of our frequency-dependent ray tracing is confirmed by the comparison of arrival angles and travel times with those of observed tsunami waveforms at an array of ocean bottom pressure gauges. The tsunami amplitude at the source is nearly twice or more of that just outside the source estimated from the array tsunami data by Green’s law.
Editor: Cham: Springer International Publishing
Idioma: Inglês

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Ray Tracing for Dispersive Tsunamis and Source Amplitude Estimation Based on Green’s Law: Application to the 2015 Volcanic Tsunami Earthquake Near Torishima, South of Japan

Sandanbata, Osamu ; Watada, Shingo ; Satake, Kenji ; Fukao, Yoshio ; Sugioka, Hiroko ; Ito, Aki ; Shiobara, Hajime

Cham: Springer International Publishing

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