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 Volcano Calendar 2019: We're proud to present our 2019 volcano calendar: 13 different and attractive images of volcanoes, volcanic landscapes and phenomena taken during volcano tours over the past few years.  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:
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 Illustrated Volcano GlossaryVolcanology  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: Volcano Calendar 2016: We're proud to present our new volcano calendar 2016: 13 different and attractive images of volcanoes, volcanic landscapes and phenomena taken during volcano tours over the past few years.  Etna's steam rings: A collection of fantastic vortex rings ("smoke rings") we observed recently on Etna.  Volcano Tours on Hawai'i: The Hawaiian Islands are not only home to the most active volcanoes in the world, Kilauea and Mauna Loa on the Big Island, but also boast a unique natural environment. Born by volcanic activity of a very active hot spot in the middle of the Pacific Plate, they are a showcase of natural history.  The term for all fine-grained volcanic products fragmented during explosive eruptions. |
