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EXAMINATION OF TSUNAMI WATER LEVEL FROM SOUTHERN COAST OF MIYAZAKI TO OSUMI PENINSULA AND TANEGASHIMA COAST OF KAGOSHIMA

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  • 宮崎県南部から大隅半島および種子島沿岸における地震津波の検討

Abstract

<p> The estimated height of the tsunami wave in the southern coastal area of Kyushu due to the Nankai trough has been examined by the Kagoshima prefectural government and Miyazaki prefectural government and certain knowledge. However, the time fluctuations of the tsunami water level along the coasts of Miyazaki prefecture, which has shallow topography, and the coasts of Osumi peninsula and Tanegashima in Kagoshima prefecture, have not been sufficiently investigated.</p><p> This study focuses on water level fluctuations when a wide range of active faults move. (1) The relationship between the maximum water level arrival time of the tsunami and the coastal topography in the coastal area was examined. (2) The relationship between the tsunami water level along the Tanegashima coast due to the reflected waves from the Osumi peninsula was clarified. In this study, we found the following. (1) In coastal areas with shallow terrain, the maximum water level is reached in the first incident wave, but in the case of bay terrain, it was found that the maximum arrival time of the tsunami occurs later than the first wave of tsunami. (2) As a result of arranging the main appearance spectra of water level fluctuations along the coast of Shibushi bay, it was confirmed that the water level rises in different major period in the inner part of the bay and the mouth of the bay that depended resonance period of the bay. (3) It was found that there are most of the eastern coast area of Tanegashima occure the maximum water level from the first wave from tsunami, but the western coast area occure the maximum water level that was affected that some reflected waves from the Osumi peninsula.</p>

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