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 Volcano Discoveries: "One of the most eye-catching guides to the world’s volcanoes ever published.  VolcanoAdventures: Our professional team of volcanologists and photographers offers unique travel opportunities: volcano expeditions, photo tours, and relaxed walking & study tours.  The Volcano Adventure Guide: Excellent information and background for anyone wishing to visit active volcanoes safely and enjoyably. The book presents guidelines to visiting 42 different volcanoes around the world. Guaranteed tours:
: spaces available / : guaranteed / : few spaces left / : booked out Support us?Maintaining the volcano and earthquake news sections on this website, the free Volcano Webcams tool and interactive map widget is a free-time, both time- and server cost intensive effort. If you find the information useful and would like to support us, and help keep it alive and improve it, please consider making a small donation. Thank you!Random pictures | |  Illustrated Volcano Glossary
Volcanology  Mauna Loa shield volcano (Big Island, Hawaii)  A large shield volcano in the Danakil desert (Ethiopia) Shield volcanoes are volcanoes that mainly erupt fluid (usually basaltic) lava flows that are able to travel over long distances and thus construct over time broad, gentle slopes. They are called shield volcanoes, because they resemble the shape of a warriors' shield. Shield volcanoes are volcanoes that mainly erupt fluid (usually basaltic) lava flows that are able to travel over long distances and thus construct over time broad, gentle slopes. They are called shield volcanoes, because they resemble the shape of a warriors' shield.
While stratovolcanoes, the other major morphological type of volcanoes, are representative for most subduction-type volcanoes, sh... -> See whole entryRelated keywords (1): photoglossary.htmlVolcanology  Skylight on Etna volcano (Italy)  Skylight on Etna volcano (Italy) Skylights are openings in the roof above a lava tube, from where the flowing lava flow can be seen. Usually, these holes are caused by the simple collapse of the roof of the tube.
Volcanology: volcanic smoke ring, gas ring, steam ring  Etna's Bocca Nuova crater in 2000, emitting smoke rings  Smoke ring detail (Etna) A rare phenomenon, where a visible vortex ring of steam and gas is expelled from a volcanic vent. Under special conditions, gas and steam expelled from a vent can form gas rings. It probably requires a particular geolometric configuration of a circular vent exit, as well as expulsion of gas in individual puffs with just the right velocity.
This phenomenon is quite rare, but has been witnessed at several volcanoes, including Stromboli and Etna. At Etna, a spectacular period lasting several mo... -> See whole entryVolcanology
 Strombolian eruptions from vents of Stromboli volcano, Eolian Islands, Italy  Strombolian eruption from Yasur volcano, Vanuatu Strombolian eruptions are the smallest type of explosive eruptions. Strombolian eruptions consist of intermittent, generally relatively small explosions or weak pulsating fountains of fluid (usually basaltic) lava from a single vent or crater.
They are called so after the type locality of Stromboli volcano (Eolian Islands, Italy), which has been in strombolian activity for probably more than 2000 years. An individual strombolian explosion is the result of sudden release of volcanic gasses. The typical rhythmic occurrence is caused by gradual accumulation of gas bubbles beneath a weakly solidified plug at the top of the magma column at the vent surface until the gas pressure is high enough to erupt through it, ejecting with it both solid and liquid spatter from the magma. -> See whole entry
More on VolcanoDiscovery:
 Definition of a volcano: A volcano is the term for any place on the surface of the earth, where hot molten rock (magma) reaches the surface.  Ethiopia and the Danakil: Ethiopia is a very diverse and beautiful country. Thanks to our numerous expeditions to Erta Ale and Dallol and beyond, we have an extensive collection of images showing the volcano's lava lake, the desert, the colorful hot springs of Dallol, the vast salt lakes, camel caravans and more.  Latest VAAC alerts: The Volcanic Ash Advisory Centers provide near-real time global monitoring of volcanic ash plumes for aviation. Read the latest (or browse past) advisories. |
