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Diaporama
jeudi, juin 06, 2013
The latest report from the Japan Meteorological Agency (which is always published with one-month delay) indicates that a small phreatic eruption occurred on 11 April this year. ... [details]
lundi, déc. 10, 2012
Visual observation via a camera installed at Asodaihigashi (about 900 m east-northeast of the Asodai collapse pit) showed that the volume of fumes from the pit (located at the west of Ioto Island) was small, and that their heights ranged from 0 to 100 m. ... [details]
 

Iwo-jima (Ioto) volcan éruptions

caldeira 161 m / 528 ft
Volcano Islands, Japon, 24.75°N / 141.29°E
Liste des éruptions: 2001, 1982, 1980, 1978, 1976, 1974 (?), 1969 (?), 1967, 1957, 1943


2001 eruption
A submarine eruption occurred from 3 vents SE of Iwo-jima volcano on 21 September 2001. The activity built 10 m diameter pyroclastic cone on that day. Until 19 October, there was no further activity, but on 19 October a small phreatic eruption occurred at Idogahama, the name of a beach on the NW coast of the island. the explosion formed a new crater 10 m wide and 2-3 m deep.

1982 eruption
On 9-10 March 1982, 5 phreatic eruptions occurred from vents on the NW shore of Iwo-jima island.

1957 eruption
A phreatic eruption occurred at Iwo-Jima volcano on 28 March 1957. The eruption occurred without warning 2 km NE of Suribachi-yama. The eruption lasted for 65 minutes and ejected material 30 m high from a single crater. A second crater formed by collapse 50 minutes after the eruption ended. The collapse crater was 30 m wide and 15 m deep. Gas emissions increased on 31 March, and 3 dead birds were found in the crater.
Source: Gilbert Corwin, and H. L. Foster (1959) "The 1957 explosive eruption on Iwo Jima, Volcano Islands", American Journal of Science, Vol. 257, pp. 161-171
 

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