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Numerical simulation of tsunami forerunners recorded by DONET stations during the 2011 Tohoku Earthquakeтезисы доклада
- Авторы: Kirill Sementsov, Sergey Kolesov, Mikhail Nosov, Hiroyuki Matsumoto, Yoshiyuki Kaneda
- Сборник: Programme and Abstracts The Seismological Society of Japan 2016 Fall Meeting
- Тезисы
- Год издания: 2016
- Место издания: Nagoya
- Первая страница: 289
- Аннотация: Small-amplitude surface gravity waves in the ocean were registered by DONET (JAMSTEC) ocean-bottom pressure gauges at epicenter distance of 800 km just after the passage of seismic waves from the disastrous 2011 Tohoku earthquake. These gravity waves were observed more than an hour before the arrival of the leading wave of the 2011 Tohoku tsunami. This fact gives us the grounds to call these waves tsunami forerunners. The amplitude and period of the tsunami forerunners amounted to 3 cm and 150 s, respectively. We assume physical mechanism of generation of the forerunners is related to horizontal movements of ocean-bottom slopes, caused by passage of low-frequency Love and Rayleigh waves. For simulation of the process of generation of tsunami forerunners we used 3D numerical model based on the linear potential theory. Dynamics of bottom movement during the passage of seismic waves was restored with the use of DONET ocean-bottom seismometers data. The results of our numerical experiments are in good agreement with the observed values. It confirmed, that horizontal movements of ocean-bottom slopes play the key role in the tsunami forerunners generation whereas the role of vertical movements is negligible. This work was supported by the Russian Foundation for Basic Research, projects 16-55-50018, 16-35-00232.
- Добавил в систему: Семенцов Кирилл Александрович