Numerical Simulation of Tsunamis in both Shibushi and Kagoshima Bays in Kagoshima Prefecture, Japan

Abstract

Numerical simulation of tsunamis in two bays in Kagoshima Prefecture was performed: Shibushi Bay and Kagoshima Bay. The former, which faces the Hyuganada connected to the Pacific, has been attacked by Hyuganada earthquake tsunamis, as well as Nankai earthquake tsunamis. In the present study, the tsunamis due to both 1968 and 1970 Hyuganada earthquakes were simulated to study the properties of tsunamis around the southern part of Kyushu including the inside of Shibushi Bay. On the other hand, although the bay mouth of the latter is not directed to the sources of these tsunamis, tsunamis have been generated by submarine volcanic eruption in the bay. We supposed the value of scale index for submarine eruption concerning tsunami generation and then simulated tsunamis due to submarine volcanic eruption in Kagoshima Bay.