Volcanic Ash Advisory Centers (VAAC) are research centres who monitor volcanic ash clouds in real time. Each time, a volcano erupts a significant ash cloud, short reports are issued and transmitted directly to air control centres. The 9 VAAC are located in London, Toulouse, Tokyo, Darwin, Anchorage, Washington, Montreal and Buenos Aireas and collectively cover most of the globe. -> See whole entry
Vakak (or Wakak) volcano is a field of 18 small volcanoes 115 km WSW of Kabul. It is the northernmost of a group of small volcanic fields in the Ghanzi region and consists of lava domes, one of which occupies an old caldera.
The age of its last eruption is unknown, but could be relatively recent (less than 10,000 years ago). -> See whole entry
The 22-km-wide Valles caldera was formed by 2 very large explosive eruptions 1.7 and 1.2 million years ago. Post caldera eruptions formed Redondo Peak dome inside the caldera.
The last eruptions of the caldera happened 50,000-60,000 years ago, depositing rhyolite ignimbrite deposits.
The caldera is still considered potentially active and has an active geothermal system with hot springs and fumaroles. -> See whole entry
The Vatnafjöll volcanic system, lying immediately SE of Hekla volcano, is a 40-km-long, 9-km-wide collection of alkali basaltic fissures and crater rows. -> See whole entry
Vernadskii Ridge comprises 3 groups of volcanoes in northern Paramushir Island, Kuril Islands, immediately south of active Ebeko volcano.
The Vernadskii and Bogdanovich groups of volcanoes are the southernmost of this complex and have been active during the past 10,000 years. -> See whole entry
The mostly submarine Vestmannaeyjar volcanic system is the southernmost and youngest volcanic center of the eastern volcanic rift zone that cuts across east-central Iceland. -> See whole entry
Veteran is a submarine volcano 34 km SSE off the Grand Catwick Rock, located off the SE coast of Vietnam.
In 1880, a new reef was reported at this location. In 1882, it had disappeared, suggesting that a volcanic eruption had occurred.
Discolored water at the site, possibly from fumarolic activity, was reported in 1928.
The area lies along a regional N-S-trending lineament related to extension produced by collision of the Australian plate.
(Source: Smithsonian / GVP)
Mt Victory Volcano is a dominantly andesitic stratovolcano on the NE coast of mainland New Guinea, 30 km from Tufi on Cape Nelson.
Mt Victory's summit contains a small crater lake. There is only 1 confirmed historical eruption from Victory volcano, but that consisted in long-lasting activity during the late 19thand until the 20th century, and its red crater glow was a well-known beacon for passing ships at that time. Pyroclastic flows occurred during this period of activity around 1880 and destroyed several villages and caused fatalities. At present, there is weak thermal activity. -> See whole entry
Viedma is a volcano underneath the Patagonian Icefield NW of Viedma Lake in southern Argentinia. Its existence was confirmed during the eruption in 1988. ONly parts of the volcano rise above the glaciers. -> See whole entry
The ability of a liquid to flow. Basalt magma has a relatively low viscosity making it runny, whereas rhyolite magma has a high viscosity making the magma thick and sticky.
The Vitim Plateau volcano is a vast volcanic field northeast of the Baikal Lake. Cinder cones and associated lava flows are spread over an area of about 10,000 sq km. -> See whole entry
Volcán Azul (also known as Volcán Blue) a group of 3 cinder cones located on the Atlantic coastal plain of Nicaragua. The volcanic cones are in an area covered by dense rainforest and were discovered during an aerial survey in the 1960s.
Note: There is another Cerro Azul volcano in Chile. -> See whole entry
