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| | Abstract | | In 1938, a tsunami as high as 1 m raided on the southern coast of Lake Kussharo, Hokkaido with M 6.1 earthquake. However, the earthquake seems to be too small to induce tsunami. On the lake bottom, a lot of mound-like hills have been found, and these were by subaqueous landslides, was suspected. The authors carried out parametric method high resolution sedimentary stratum exploration in Lake Kussharo for the purpose of grasping the deformation of the bottom and subbottom of a lake aspect to contribute to the tsunami occurrence. As a result, we confirmed large number of landslide debris and moving mound-like hills on the bottom of a lake slope, and it was revealed by reflection record sections that bottom of a lake landslide activity occurred repeatedly. |
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