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Myōjin-shō (明神礁) is a submarine volcano located about 450 kilometers south of Tokyo on the Izu-Ogasawara Ridge in the Izu Islands. Volcanic activity has been detected there since 1869. Since then it has undergone more eruptions, the most powerful of which resulted in the appearance and disappearance of a small island.
Repeated volcanic eruptions in 1939 and 2002 have set the flora on Tori-shima back to initial stages in the ecological succession.Plants such as Vitex rotundifolia and hydrangea are found near the shoreline, and Chrysanthemum pacificum and Japanese black pine in sheltered areas inland, but most of the central portion of the island remains as volcanic ash and rock.
The only recorded eruption was an event on 13 July 1989. Two earthquakes, on 30 June and 9 July took, place on the Izu-Tobu Volcano.On 13 July, a seismometer recorded seismicity, a research vessel, the RV Takuyo reported hearing an explosion sound from the sea floor followed by a 30-second vibration at 18:33 pm.
The islands occupy the northern portion of the Izu–Bonin–Mariana Arc which extends to the Izu Peninsula and Mount Fuji on the Honshū mainland which are northern extensions of the Izu volcanic arc. The Izu arc ends there at a tectonic triple junction. Volcanic activity is frequent in the area. [2] 31 people were killed when the research ...
1986 Izu Ōshima eruption. Mount Mihara's major eruption in 1986 saw lava fountains up to 1.6 kilometres (1.0 mi) high. The eruption had a Volcanic Explosivity Index of 3, and involved a central vent eruption, radial fissure eruption, explosive eruption, lava flows, and a lava lake eruption. There was also a 16 km high subplinian plume. All of ...
Izu Ōshima (伊豆大島, Izu-ōshima) is an inhabited volcanic island in the Izu archipelago in the Philippine Sea, off the coast of Honshu, Japan, 22 km (14 mi) east of the Izu Peninsula and 36 km (22 mi) southwest of Bōsō Peninsula. [1]
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.
Hachijō-jima is a compound volcanic island that is 14.5 kilometres (9 miles) in length with a maximum width of 8 kilometres (5 miles). The island is formed from two stratovolcanoes . [ 24 ] Higashi-yama ( 東山 ) —also called Mihara-yama ( 三原山 ) —has a height of 701 m (2,300 ft) and was active from 100,000 BC to around 1700 BC. [ 25 ]