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Ambrym volcan

Mise à jour: 26 sept.. 2022 07:28 GMT -
volcan bouclier 1334 m (4,377 ft)
Vanuatu, -16.25°S / 168.12°E
Condition actuelle: normal / en sommeil (1 sur 5)
Last update: 5 mai 2022 (Smithsonian / USGS Weekly Volcanic Activity Report)
The crater of Benbow (Ambrym)
The crater of Benbow (Ambrym)

Ambrym is a large basaltic volcano with a 12-km-wide caldera. It is not only one of the most active volcanoes of Vanuatu, but in the world. Its most active craters often contain small lava lakes.

Montrer carte interactive
Style éruptif tipique: Effusive, formation of lava lakes
Eruptions du volcan Ambrym: 1774, 1820(?), 1863, 1870(?), 1871, 1883, 1884, 1886, 1888, 1894, 1898, 1908, 1909(?), 1910, 1912, 1913, 1915, 1929, 1935, 1937, 1938, 1942, 1950, 1952, 1953, 1954, 1955, 1957, 1958, 1960, 1961, 1963, 1964, 1967, 1971, 1972, 1973, 1977 (2x), 1979 (2x), 1980, 1981, 1983, 1984, 1986, 1988, 1989, 1990, 1994, 1996, 2006, 2008, 2009 -ongoing

Derniers séismes proches

No recent earthquakes

Introduction

Ambrym is a large basaltic volcano with a 12-km-wide caldera. It is not only one of the most active volcanoes of Vanuatu, but also in the world.
Ambrym's caldera is a wide, impressive moon-like landscape containing an ash plain, cut by innumerable erosion gullies and containing several active craters and recent lava flows.
The caldera is believed to have formed during a major plinian eruption with dacitic pyroclastic flows about 1900 years ago. Activity after the caldera formation was concentrated around two vents that have become large complex craters called Marum and Benbow. Often, both Marum and Benbow (as well as other craters) contain small lava lakes, which occasionally erupt lava flows onto the caldera floor, or even exit the caldera through erosion gaps.
The post-caldera eruptions have also formed a series of scoria cones and maars along a fissure system oriented ENE-WSW. Eruptions have apparently occurred almost yearly during historical time from cones within the caldera or from flank vents. However, from 1850 to 1950, reporting was mostly limited to extra-caldera eruptions that would have affected local populations.
Occasionally, explosive eruptions occur from the craters, mostly because of water-magma interaction. Such eruptions produce tall clouds of ash, and can cause serious health problems in the local population because the ash contaminates ground water.

Ambrym Photos




See also: Sentinel hub | Landsat 8 | NASA FIRMS

Voyages au volcan Ambrym

8 jours d'expédition sur les volcans d'Ambrym - individuels et groupes - 4 lacs de lave, Marum, Benbow
8 jours - Modérée
Prix 3150 €
pas de groupe programmé pour le moment
Expédition de 15 jours sur les volcans actifs du Vanuatu: Yasur, Marum et Benbow
15 jours (14 nuits) au Vanuatu - Modérée
Prix 4150 €
2-16 juil. 2023

Map of the Ambrym caldera

map of Ambrym caldera
A sketch map of the vast caldera of Ambrym showing the location of its multiple vents. Taken from Stromboli Online.
The crater of Benbow in the Ambrym caldera
The crater of Benbow in the Ambrym caldera

jeu., 5 mai 2022, 06:40

Ambrym volcano (Vanuatu) - Smithsonian / USGS Weekly Volcanic Activity Report for 27 April-3 May 2022 (Continuing Activity)

The Vanuatu Meteorology and Geo-Hazards Department (VMGD) reported that incandescence from Ambrym's Benbow Crater was visible during 25 January-3 February from a lava flow that had effused from a new vent on the NW part of the crater floor. Recent observations indicated that gas and ash was no longer being emitted from the crater, and seismicity had decreased and stabilized. The Alert Level was lowered to 1 (on a scale of 0-5) on 28 April. ... Read all
dim., 1 mai 2022, 21:19

Ambrym volcano (Vanuatu): Volcanic Alert Level lowered to Level 1

Ambrym volcano as visible in the webcam today (image: VMGD)
The alert status for the volcano was lowered to "Level 1", as the activity rapidly decreased after the intense phase from Benbow crater at the end of January 2021. ... Read all
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