Full glossary

Piccole sfere sferiche di cenere vulcanica

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The big caldera of Acigöl-Nevsehir is located in central Turkey and has a size of 7-8 km diameter.

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Lago salato in Etiopia

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Agata è una varietà microcristallina di quarzo (silice), principalmente Calcedonio, caratterizzata dalla sua finezza della grana e la luminosità del colore.

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Agios Georgios è un piccolo porto sulla penisola Methana in Grecia

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Augustine is the most active volcano of the eastern Aleutian arc. It consists of several overlapping lava domes that frequently produce explosive eruptions and are notorious for collapsing, producing glowing avalanches (block and ash flows).
Augustine volcano had a devastating eruption 1883 when large parts of the summit dome complex collapsed. In the following century, several eruptions associated with dome growth have restored the volcano's height again. Historical eruptions after that date were typically explosive, producing pyroclastic pumice flows and block-and-ash flows, followed by regrowth of the lava domes.

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Agua de Pau stratovolcano in central Sao Miguel Island contains an outer 4 x 7 km caldera formed about 30,000 to 45,000 years ago and an inner 2.5 x 3 km caldera that was created about 15,000 years ago.

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Mount Agung or Gunung Agung is a active volcano in Bali. This stratovolcano is the highest point on the island. It dominates the surrounding area influencing the climate. The clouds come from the west and Agung takes their water so that the west is lush and green and the east dry and barren.

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Akrotiri è un villaggio nel sud-ovest dell'isola di Santorini

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The Bodrum & Akyarlar volcanics belong to the area of the active Cos volcanic complex and are the most western volcanics of Turkey.

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Il rivestimento lavico intorno a un tronco d'albero lasciato da un flusso di lava liquida invasore.

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Alligator Lake in southern Yukon, Canada, is a group of basaltic cones and lava flows (the Miles Canyon basalts). It is located at the northern extremity of the Stikine volcanic belt, 30 km southwest of the capital city Whitehorse.
The field contains 2 cinder cones on top of a small basaltic shield volcano which is eroded by glacial cover. The cones probably post-date the ice age and seem to be a few thousands years old. Lava flows from both cones traveled to the north and were erupted simultaneously. The longest lava flow extends 6 km N and reaches a width of 10 km.

A series of eruptive fissures near Dalaffilla volcano at the northern end of the Erta Ale range (Danakil desert, Ethiopia), many of which have erupted voluminous basaltic lava flows, as recently as in Nov. 2008.

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The Amboy volcanic field covers an area of 70 km2 between Bagdad Dry Lake to the west and Bristol Dry Lake to the east in the Mojave Desert, California. It contains mainly pahoehoe lava flows. Amboy crater proper is a prominant cinder cone in the NE of the lava field.

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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.

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Amiata is a lava dome complex located about 20 km NW of Lake Bolsena in the southern Tuscany region of Italy.

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Tradotto letteralmente, "il bambino di Krakatau," Anak Krakatau è l'isola più giovane dell'arcipelago vulcanico Krakatau nello stretto della sonda. Si è formata durante nuove eruzioni nel 1927, quando una nuova isola apparso nella caldera lasciato dall'enorme eruzione del vulcano Krakatau nel 1883.

Andesite è un grigio di roccia vulcanica nera con tra circa 52 e 63 peso percentuale silice (SiO2). Andesiti sono tipici per cupole di lava e stratovolcanoes.

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Un fenomeno raro, dove un anello di vortice visibile di vapore e gas viene espulso da uno sfogo vulcanico.

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Rajabasa is a prominent, isolated volcano along the Sunda Strait at the SE-most tip of Sumatra.

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Aragats is a large andesitic-to-dacitic stratovolcano in NW Armenia about 40 km NW of the capital city of Yerevan.

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The 5165-m-high, double-peaked stratovolcano Mount Ararat, also known as Agri Dagi, is Turkey's highest, largest volume, and easternmost volcano.

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Arenal, una grande attrazione turistica in Costa Rica, è uno dei vulcani più attivi dell'America centrale. Poiché una grande eruzione nel 1968, è stato in attività quasi continua, costruendo una cupola lavica e visualizzazione attività esplosiva mite dal cratere di vertice.

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Caduta di cenere vulcanica è la deposizione di cenere dall'aria da eruzione pennacchi emessi durante le eruzioni vulcaniche esplosive.

Capitale della Grecia, situato sulla penisola di Attika del continente meridionale

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Atlin is a group of young cinder cones and lava flows on the Teslin Plateau east of Lake Atlin in western British Columbia, Canada. The largest cone is 1880-m-high Ruby Mountain (named for the brilliantly colored tephra deposits), which has been partially eroded by glaciation.

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The Auckland Volcanic Field directly underlies the largest city of New Zealand and consists of more than 50 basaltic cones, maars and lava flows. It covers an elliptical area of 29 (N-S) x 16.5 (E-W) km and has been active for the past 140,000 years, during which is has produced about 7 cubic km of mostly basaltic lava. The last eruption was as recently as about 600 years ago when the cone of Rangitoto Island was formed. About 20 eruptions have occurred during the past 20,000 years, suggesting an average recurrence interval of approx. 1000 years.
Since eruptions could (and likely will) occur again in the future, it is a considerable hazard to Auckland city, especially since the time between first signs (seismic swarms, ground movements, gas emissions) to an eruption could be relatively short (weeks to months).

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Avachinsky towering above Petropavlovsk, Kamchatka's largest city, is one of Kamchatka's most active volcanoes. It typically erupts every few years to decades, often producing ash flows and lahars.

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