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TSUNAMI HEIGHT AND EDGE WAVES IN THE CENTRAL WESTERN PART OF KAGOSHIMA BAY CAUSED BY A DIRECT EARTHQUAKE

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  • 直下型地震における鹿児島湾中央西部での津波波高とエッジ波生成の検討
  • チョッカガタ ジシン ニ オケル カゴシマワン チュウオウ セイブ デ ノ ツナミハ ダカ ト エッジハ セイセイ ノ ケントウ

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Abstract

<p> It has been pointed out that the generation of tsunami edge waves propagating in the shore line on the continental shelf is one of the causes of the spread of the disaster areas of the Hokkaido Tokachi-oki Earthquake Tsunami (2003) and the Tohoku-Pacific Ocean Earthquake Tsunami (2011). In 2017, there was a M5.3 earthquake with an epicenter of the central western of Kagoshima bay where no active faults identified.In this paper, we investigated the relationship between fault parameters and tsunami height for the entire Kagoshima Bay using a two dimensional model assuming a direct earthquake occurring in the bay.Next, we investigated the generation of tsunami height and edge waves in the coastal area by reproducing the detailed 3D topography of the coastal area in the central western part of the bay and using a 3D computational fluid model. As the results, When the source location and the fault parameters were changed, the maximum wave was the first wave at the offshore measurement point in most cases.At the coastal measurement points, there were several points that satisfied the edge wave dispersion relational expression, and there is a possibility that standing edge waves and progressive edge waves were generated in the central coastal area of the bay.</p>

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