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1741 Eruption Of Oshima–Ōshima And The Kampo Tsunami
The devastating eruption of Oshima–Ōshima began on the 18th of August, 1741 and ended on May 1 the next year. Eleven days into the eruption, the Kampo tsunami (Japanese: 寛保津波, Hepburn: ''Kampo tsunami'') with estimated maximum heights of over 90 meters swept across neighboring islands in Japan and the Korean Peninsula. Background Japan is situated along a zone of convergence between at least four major and minor tectonic plates. The Philippine Sea Plate dives beneath the Amurian Plate and Okinawa Plate along the Nankai Trough and Ryukyu Trench in southern Japan. In northern Japan, the Pacific Plate subducts beneath the Okhotsk Plate, part of the larger North American Plate, along the Japan and Kuril trenches. The subduction process is related to the production of volcanoes in Japan as the downgoing oceanic slab undergoes dehydration at depths of roughly beneath the overriding plate. Water in the structure of hydrated minerals interact with the upper mantle, lowerin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Oshima (Hokkaido)
(means "big island") is an uninhabited island in the Sea of Japan, to the west from Matsumae town and therefore the westernmost point of Hokkaido. It is part of the town of Matsumae in Oshima Subprefecture in Hokkaido, Japan. To distinguish Ōshima from other islands with the same name, it is sometimes known as or . At , Ōshima is the largest uninhabited island under Japanese sovereignty. The island is a double caldera with a scoria hill rising in the middle. It is the peak of two overlapping stratovolcanoes and their associated calderas, Mount Higashi and Mount Nishi. The highest peak, at , is part of a triple volcano. The peak rises close to from the sea floor. The island consists of mafic alkali and non-alkali volcanic rock, less than 18,000 years old. On the south side of the island at , there is a lighthouse and a heliport operated by Japan Coast Guard. Because of volcanic activity and nature conservation, landing on the island requires the approval of the Agency ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
