大阪における安政南海道津波の復元(1)-氾濫災害について-

Abstract

The objective of this study is to recreate a flood disaster in Osaka due to the Ansei NankaidoTsunami on December 24, 1854. The analysis is based on data of the disaster such as oldillustrations of the flood in woodcut, a number of historical documents and private letters andphotographs of the Tenpouzan lighthouses. In the central area in Osaka, there were many canalsto offer shipment and to use as sewerage. Since two big earthquakes (M8.4) of the seismicintensity of five in Osaka and many micro earthquakes had occurred on December 23 and 24, many people took refuge on small boats in the canals. The tsunami inundated into the reclamationarea along the coast and the canals accompanying with many large ships anchored at the mouthsof rivers such as the Kizu and Aji Rivers. About one thousand people were drowned and killedby overturn of ships. The innundation heights of the tsunami is estimated to be about 1.9 m.The height is also justified through the comparison between the flooded area roughly estimatedand the old illustration.