[SVC38-P42] Investigating Origin of landslide-like bathymetric feature at southern Mt.Kaimon using bathymetric and multichannel seismic reflection surveys
Keywords:seismic reflection, ocean bottom topography, Kaimondake
・North-Eastern part; this area is large rugged sea bottom and slope. In the reflection profile, the boundary of upper and lower layers is not so clear. Deeper layers are not observed.
・South-Eastern part; this part is little rugged sea bottom and slope. In the reflection profile, there are some reverse faults and the fault strikes are East-West direction. Stratified structures are also found in spots.
・Central part; this part is the least rugged sea bottom and slope of four area. In the reflection profile, there are a lot of reverse faults. The fault strikes are always North-northwest-South-southeast direction. Stratified structures are found at eastern and western edge.
・Western part; this part is not as large as North-Eastern part, but large rugged sea bottom and slope. In the reflection profile, there are many (but less than Central part) reverse faults, and the fault strikes are North-South.
These characteristic features duggest that an event sweeping the ocean bottom was occurred at northern North-Eastern part, and directions the sweeping landslide are moving in south and west-southwest. It is because deeper layers are effected by collapse at North-eastern part, compressional stress is estimated by faults and folds (direction at the eastern part is North-South and at the central-western part is East-West) and bathymetric feature is more rugged at the eastern part.