Matsushima Bay As an Early Holocene Coastal Mega-Landslide, Northeast Japan
Matsushima Bay as an Early Holocene coastal mega-landslide, Northeast Japan Shuichi Hasegawa (Kagawa University, Japan) Timihiro Sawada (Sawa Soft Science, Japan) Ranjan Kumar Dahal (Kagawa University, Japan and Tribhuvan University, Nepal) Atsuko Nonomura (Kagawa University, Japan) Minoru Yamanaka (Kagawa University, Japan) Abstract. Matsushima, a group of island at Matsushima Bay visited both Matsushima and Kisakata. He composed three in Miyagi Prefecture, northeast Japan, is one of the three haiku poems for Kisakata, but he could not express his famous scenic spots of Japan. It is composed of more than excitement in a haiku poem for Matsushima. 200 islands in Matsushima Bay and the islands just out into Matsushima and Matsushima Bay have long been the sea. Topographically Matsushima Bay suddenly breaks considered as a typical submerged coast, but they are inferred the gently concaved coastline from Sendai Bay to Ishinomaki to have been formed by a coastal mega-landslide in middle Bay. Matsushima and Matsushima Bay have been considered Holocene age from geological and topographical inferences. as a typical submerged coast, but they are inferred to have been formed by a coastal mega-landslide in middle Holocene age from geological and topographical evidences. Keywords. Mega-landslide, Holocene, Jomon transgression, Active fault, topography 1. Introduction Mega-landslides due to volcanic activities and earthquakes have caused severe damage to the surrounding areas. Sector collapse of volcanoes is one of the most destructive landslides. Debris avalanche deposits from a sector collapse generally form strange topography punctuated by hundreds of small hills, ridges and closed depressions. The 1792 Mayuyama sector collapse of Unzen volcano in Kyushu, southern Japan, caused debris avalanche which flowed through ancient Shimabara City and entered the sea.
[Show full text]