Effusive eruptions are a volcanic phenomenom; in some ways the opposite of explosive eruptions. An effusive eruption is characterised by an outpouring of low viscositylava which has a fairly low volatile content. Mount Stromboli is a classical example of a volcano which erupts in this manner; however, it can also produce an explosive eruption. This article is about volcanoes in geology. ... The pitch drop experiment at the University of Queensland. ... Look up lava, Aa, and pahoehoe in Wiktionary, the free dictionary. ... Volatile is the name of more than one concept: A financial instrument with high volatility is considered volatile in economics. ... Sciara del fuoco For other uses see Stromboli (disambiguation) Stromboli is a small island in the Tyrrhenian Sea, containing one of the active volcanos in Italy. ...
Rhyolitic flow eruptions are a type of effusive eruptions, characterized by large volumes of fluid rhyolitic lava. The 1912 eruption of Mount Katmai is an example. Rhyolite Rhyolite is an igneous, volcanic (extrusive) rock, of felsic composition, with aphanitic to porphyritic texture. ... This article is about Katmai, the volcano. ...
In 1989 the Voyager 2 spacecraft observed ice volcanoes (cryovolcanism) on Triton, a moon of Neptune and in 2005 the Cassini-Huygens probe photographed fountains of frozen particles erupting from Saturn's moon Enceladus.
However, it is known that an eruption usually follows movement of magma upwards into the solid layer (the earth's crust) beneath a volcano and occupying a magma chamber.
Jesuit Athanasius Kircher (1602-1680), witnessed eruptions of Aetna and Stromboli, then visited the crater of Vesuvius and published his view of an Earth with a central fire connected to numerous others caused by the burning of sulfur, bitumen and coal.
The type of eruption (whether effusive or explosive) and the possibility of forecasting the magnitude of the eruptive event has major importance for the mitigation of the volcanic hazard, bearing in mind that these volcanoes are close to densely inhabited areas.
This is the case of the last activity period of the volcano started in 1631 with a devastating eruption, recorded in most of the southern slopes of the volcano, and ended in 1944, with the eruption of pyroclastic rocks and a lava lobe that destroyed the outskirts of the village of San Sebastiano.
It is useful to note that the plinian eruptions that begin the periods of activity are generally made up of very strongly differentiated volcanic rocks (mostly phonolites), that form after the prolonged differentiation in shallow reservoirs of mafic alkaline magmas ultimately coming from the upper mantle.
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