Abstract
The JAMSTEC offshore monitoring system located on the 2.3km-deep seabed near the sourse of the 2003 Tokachi-oki earthquake (M8.0) left us very precious observation records of ground motion and water pressure. Based on the records, findings on tsunami generation process estimated from the dynamic tsunami simulation are demonstrated in this paper. In contrast to traditional assumption, the tsunami generation process is made up of three components in terms of the water pressure. The first is short period vibration due to acoustic waves, the second longer period variation induced by Rayleigh waves, and the third a long-period tsunami.
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