This article is about the island. For the administrative village that spans it, see Aogashima, Tokyo.
Aogashima (青ヶ島) is a volcanic island to the south of Japan in northernmost Micronesia. It is the southernmost and most isolated inhabited island of the Izu Islands. The islands border the northeast Philippine Sea and lie north of the Ogasawara Islands.[1][2] The island lies approximately 358 kilometres (222 mi) south of mainland Tokyo and 64 kilometres (40 mi) south of Hachijō-jima.
The island is administered by the village of Aogashima, which is subordinate to the Hachijō Subprefecture, which itself is governed by the City of Tokyo. The island has an area of 8.75 km2 (3.38 sq mi), and, as of 2014[update], its population is a mere 170 people. This means that the village of Aogashima has the smallest population of any municipality in Japan. Aogashima is also part of the Fuji-Hakone-Izu National Park.
Aogashima is a complex Quaternary volcanic island 3.5 km in length with a maximum width of 2.5 km, formed by the overlapping remnants of at least four submarine calderas. The island is surrounded by very steep rugged cliffs of layered volcanic deposits. The southern coast also rises to a sharp ridge forming one edge of a caldera named Ikenosawa (池之沢) with a diameter of 1.5 km. The caldera dominates the island, with one point on its southern ridge, Otonbu (大凸部) with a height of 423 metres (1,388 ft), as the island's highest point. The caldera is occupied by a secondary cone named Maruyama (丸山). Still considered a Class-C active volcano by the Japan Meteorological Agency, the last eruption of Aogashima was during a four-year period from 1781–1785. It is located along the Izu–Bonin–Mariana Arc.
The history of human settlement on Aogashima is uncertain. Most of the people on Aogashima are Japanese. The island is mentioned in Edo period records kept at Hachijō-jima, which recorded volcanic activity in 1652, and from 1670 to 1680. An earthquake swarm in July 1780 was followed by steam rising from the lakes in the Ikenosawa Caldera. Further earthquakes in May 1781 led to an eruption. In April 1783, lava flows from the Maruyama cone resulted in the evacuation of all 63 households on the island. During a massive eruption in 1785, some 130–140 of the population of 327 islanders perished. There has been no significant volcanic activity since the 18th century.
^Gotoh, H. et al. (2010). "Infrastructure Maintenance and Disaster Prevention Measures on Isolated Islands: the Case of the Izu Islands near Tokyo" in Island Sustainability (Favro, S., editor), p. 187.
aogashima, this, article, about, island, administrative, village, that, spans, tokyo, 青ヶ島, volcanic, island, south, japan, northernmost, micronesia, southernmost, most, isolated, inhabited, island, islands, islands, border, northeast, philippine, north, ogasaw. This article is about the island For the administrative village that spans it see Aogashima Tokyo Aogashima 青ヶ島 is a volcanic island to the south of Japan in northernmost Micronesia It is the southernmost and most isolated inhabited island of the Izu Islands The islands border the northeast Philippine Sea and lie north of the Ogasawara Islands 1 2 The island lies approximately 358 kilometres 222 mi south of mainland Tokyo and 64 kilometres 40 mi south of Hachijō jima AogashimaNative name 青ヶ島GeographyLocationIzu IslandsCoordinates32 27 25 2 N 139 46 1 2 E 32 457000 N 139 767000 E 32 457000 139 767000ArchipelagoIzu IslandsArea8 75 km2 3 38 sq mi Length3 5 km 2 17 mi Width2 5 km 1 55 mi Coastline9 km 5 6 mi Highest elevation423 m 1388 ft AdministrationJapanPrefectureTokyoSubprefectureHachijō SubprefectureVillageAogashimaDemographicsPopulation170 January 2014 The island is administered by the village of Aogashima which is subordinate to the Hachijō Subprefecture which itself is governed by the City of Tokyo The island has an area of 8 75 km2 3 38 sq mi and as of 2014 update its population is a mere 170 people This means that the village of Aogashima has the smallest population of any municipality in Japan Aogashima is also part of the Fuji Hakone Izu National Park Contents 1 Geology 2 Important Bird Area 3 History 4 See also 5 References 6 External linksGeology editAogashima is a complex Quaternary volcanic island 3 5 km in length with a maximum width of 2 5 km formed by the overlapping remnants of at least four submarine calderas The island is surrounded by very steep rugged cliffs of layered volcanic deposits The southern coast also rises to a sharp ridge forming one edge of a caldera named Ikenosawa 池之沢 with a diameter of 1 5 km The caldera dominates the island with one point on its southern ridge Otonbu 大凸部 with a height of 423 metres 1 388 ft as the island s highest point The caldera is occupied by a secondary cone named Maruyama 丸山 Still considered a Class C active volcano by the Japan Meteorological Agency the last eruption of Aogashima was during a four year period from 1781 1785 It is located along the Izu Bonin Mariana Arc nbsp Maruyama is the central cone in the caldera nbsp Maruyama in a close viewImportant Bird Area editThe island has been recognised as an Important Bird Area IBA by BirdLife International because it supports populations of Japanese woodpigeons Pleske s grasshopper warblers Ijima s leaf warblers and Izu thrushes 3 History editThe history of human settlement on Aogashima is uncertain Most of the people on Aogashima are Japanese The island is mentioned in Edo period records kept at Hachijō jima which recorded volcanic activity in 1652 and from 1670 to 1680 An earthquake swarm in July 1780 was followed by steam rising from the lakes in the Ikenosawa Caldera Further earthquakes in May 1781 led to an eruption In April 1783 lava flows from the Maruyama cone resulted in the evacuation of all 63 households on the island During a massive eruption in 1785 some 130 140 of the population of 327 islanders perished There has been no significant volcanic activity since the 18th century See also editList of islands of Japan List of volcanoes in JapanReferences edit Gotoh H et al 2010 Infrastructure Maintenance and Disaster Prevention Measures on Isolated Islands the Case of the Izu Islands near Tokyo in Island Sustainability Favro S editor p 187 Nussbaum Louis Frederic 2005 Izu Shotō Japan Encyclopedia p 412 Aogashima Island BirdLife Data Zone BirdLife International 2021 Retrieved 25 January 2021 External links edit nbsp Tokyo portal Aogashima Village Official Website Aogashima Japan Meteorological Agency in Japanese Aogashima National catalogue of the active volcanoes in Japan PDF Japan Meteorological Agency Aogashima Geological Survey of Japan Aogashima Global Volcanism Program Smithsonian Institution Retrieved 2021 06 25 Retrieved from https en wikipedia org w index php title Aogashima amp oldid 1208878967, wikipedia, wiki, book, books, library,
