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	'''Volcanology''' (also spelled '''vulcanology''') is the study of [[volcanoes]], [[lava]], [[magma]], and related [[geology\|geological]], [[geophysical]] and [[geochemistry\|geochemical]] phenomena. The term ''volcanology'' is derived from the [[Latin language\|Latin]] word ''[[Vulcan (mythology)\|vulcan]]'', the [[Roman mythology\|Roman god]] of fire.		'''Volcanology''' (also spelled '''vulcanology''') is the study of [[volcanoes]], [[lava]], [[magma]], and related [[geology\|geological]], [[geophysical]] and [[geochemistry\|geochemical]] phenomena. The term ''volcanology'' is derived from the [[Latin language\|Latin]] word ''[[Vulcan (mythology)\|vulcan]]'', the [[Roman mythology\|Roman god]] of fire.
			__NOTOC__
	A '''volcanologist''' is a person who studies the formation of volcanoes, and their current and historic eruptions. Volcanologists frequently visit volcanoes, especially active ones, to observe [[volcano\|volcanic eruption]]s, collect eruptive products including [[tephra]] (such as [[Volcanic ash\|ash]] or [[pumice]]), [[Rock (geology)\|rock]] and [[lava]] samples. One major focus of enquiry is the prediction of eruptions; there is currently no accurate way to do this, but predicting eruptions, like predicting earthquakes, could save many lives.		A '''volcanologist''' is a person who studies the formation of volcanoes, and their current and historic eruptions. Volcanologists frequently visit volcanoes, especially active ones, to observe [[volcano\|volcanic eruption]]s, collect eruptive products including [[tephra]] (such as [[Volcanic ash\|ash]] or [[pumice]]), [[Rock (geology)\|rock]] and [[lava]] samples. One major focus of enquiry is the prediction of eruptions; there is currently no accurate way to do this, but predicting eruptions, like predicting earthquakes, could save many lives.

wikademia>Wikademia: from http://en.wikipedia.org/wiki/Volcanology

2009-08-20T17:30:31Z

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'''Volcanology''' (also spelled '''vulcanology''') is the study of [[volcanoes]], [[lava]], [[magma]], and related [[geology|geological]], [[geophysical]] and [[geochemistry|geochemical]] phenomena. The term ''volcanology'' is derived from the [[Latin language|Latin]] word ''[[Vulcan (mythology)|vulcan]]'', the [[Roman mythology|Roman god]] of fire.

A '''volcanologist''' is a person who studies the formation of volcanoes, and their current and historic eruptions. Volcanologists frequently visit volcanoes, especially active ones, to observe [[volcano|volcanic eruption]]s, collect eruptive products including [[tephra]] (such as [[Volcanic ash|ash]] or [[pumice]]), [[Rock (geology)|rock]] and [[lava]] samples. One major focus of enquiry is the prediction of eruptions; there is currently no accurate way to do this, but predicting eruptions, like predicting earthquakes, could save many lives.

== History of volcanology ==
Volcanology has an extensive history. The earliest known recording of a volcanic eruption may be on a wall painting dated to about 7000 B.C.E. found at the Neolithic site at Çatal Höyük (now known as [[Çatalhöyük]]), in [[Anatolia]], [[Turkey]]. This painting has been interpreted as a depiction of an erupting volcano, with a cluster of houses below shows a twin peaked volcano in eruption, with a town at its base (though archaeologists now question this interpretation <ref name=Meece> Meece, Stephanie, (2006)''A bird’s eye view - of a leopard’s spots. The Çatalhöyük ‘map’ and the development of cartographic representation in prehistory'' Anatolian Studies 56:1-16. See http://www.dspace.cam.ac.uk/handle/1810/195777</ref>). The volcano may be either [[Mount Hasan|Hasan Dağ]], or its smaller neighbour, Melendiz Dağ. <ref name=Ülkekul> Ülkekul, Cevat, (2005)''Çatalhöyük Şehir Plani: Town Plan of Çatalhöyük'' Dönence, Istanbul.</ref>

=== Mythical explanations ===
The classical world of Greece and the early [[Roman Empire]] explained volcanoes as the work of the gods as science and alchemy had no explanation for their existence. Grecian myths and tales tell of [[Atlantis]], a fabled island which sank into the sea. Plato (428-348 B.C.) told of the disappearance of a vast island and its powerful civilization, the Atlanteans, in two of his dialogues, ''Critias'' and ''Timaeus''. It is now considered that the island of [[Thera]], now [[Santorini]], in the Aegean Sea, was destroyed by a tremendous series of volcanic explosions around 1620 B.C., with ash falls of up to a foot deep recorded in Turkey. The explosion of Thera sent colossal tsunamis, estimated at 100 feet height, racing across the Aegean, and the southern coast of Crete. Other recordings of the Thera eruption spawned Greek myths, namely the ''Deucalion'', in which [[Poseidon]], god of the sea, took revenge upon [[Zeus]] by inundating [[Attica]], [[Argolis]], [[Salonika]], [[Rhodes]] and the coast of [[Lycia]] (Turkey) to [[Sicily]].

Greeks also considered that [[Hephaestus]], the god of fire, sat below the volcano [[Etna]], forging the weapons of Zeus. His minions, the [[cyclops]] with their single staring eye, may be an allegory to the round craters and cones of a volcano. Indeed, the Greek word used to describe volcanoes was ''etna'', or ''hiera'', after [[Heracles]], the son of Zeus. The Roman poet [[Virgil]], in interpreting the Greek mythos, held that the hero [[Enceladus (mythology)|Enceladus]] was buried beneath Etna by the goddess Athena as punishment for disobeying the gods; the mountain's rumblings were his tormented cries, the flames his breath and the tremors his railing against the bars of his prison. Enceladus' brother [[Mimas (giant)|Mimas]] was buried beneath [[Vesuvius]] by Hephaestus, and the blood of other defeated giants welled up in the Phlegrean Fields surrounding Vesuvius.

Tribal legends of volcanoes abound from the [[Pacific Ring of Fire]] and the Americas, usually invoking the forces of the supernatural or the divine to explain the violent outbursts of volcanoes. [[Taranaki]] and [[Tongariro]], according to Māori mythology, were lovers who fell in love with [[Pihanga]], and a spiteful jealous fight ensued. Māori will not to this day live between Tongariro and Taranaki for fear of the dispute flaring up again.

=== Greco-Roman science ===
[[Image:Vesuvius1822scrope.jpg|thumb|Eruption of Vesuvius in 1822. The eruption of AD 79 would have appeared very similar.]]
The first attempt at a scientific explanation of volcanoes was undertaken by the Greek philosopher [[Empedocles]] (c. 490-430 B.C.), who saw the world divided into four elemental forces, of Earth, Air, Fire and Water. Volcanoes, Empedocles maintained, were the manifestation of Elemental Fire. Plato contended that channels of hot and cold waters flow in inexhaustible quantities through subterranean rivers. In the depths of the earth snakes a vast river of fire, the ''Pyriphlegethon'', which feeds all the world's volcanoes. Aristotle considered underground fire as the result of "the...friction of the wind when it plunges into narrow passages."

Wind would play a key role in explanations of volcanoes until the 16th century. [[Lucretius]], a Roman philosopher, claimed Etna was completely hollow and the fires of the underground driven by a fierce wind circulating near sea level. Ovid believed that the flame was fed from "fatty foods" and eruptions stopped when the food ran out. [[Vitruvius]] contended that sulfur, alum and bitumen fed the deep fires. Observations by [[Pliny the Elder]] noted the presence of earthquakes preceded an eruption; he died in the eruption of [[Vesuvius]] in 79 AD while investigating it at [[Stabiae]]. His nephew, [[Pliny the Younger]] gave detailed descriptions of the eruption in which his uncle died, attributing his death to the effects of toxic gases. Such eruptions have been named [[Plinian]] in honour of the two authors.

=== Christian mythology ===
The study of volcanology was not advanced much between the days of Plato and Hutton. The Christian world explained volcanoes by a multitude of prescientific notions, but it was also thought they were the work of [[Satan]] or the wrath of God, and only saintly miracles could avert their wrath. For this reason the [[relic|relics]] of [[Saint Agatha]] were paraded in front of lava advancing on [[Catania]] in 253 A.D., and miraculously the lava clove in two (down two valleys) and spared the town. Unfortunately the relics of St. Agatha proved ineffective in 1669, with the loss of much of Catania to Etna's lava.

In 1660 the eruption of Vesuvius rained twinned [[pyroxene]] crystals and ash upon the nearby villages. The twinned pyroxene crystals resembled the crucifix and this was interpreted as the work of [[Saint Januarius]]. In [[Naples]], the relics of St Januarius are paraded through town at every major eructation of Vesuvius. The register of these processions allowed British diplomat and amateur naturalist [[William_Hamilton_%28diplomat%29|Sir William Hamilton]] to document Vesuvius' eruptions, one of the first few 'scientific' studies of the eruptive history of a volcano.
[[Image:Vesuvius from plane.jpg|thumb|An aerial photo of Vesuvius]]

=== Renaissance observations ===
Renaissance descriptions of volcanoes vastly improved the state of knowledge, despite the resistance of the Church to scientific explorations of the natural world, especially those which were at odds with Biblical teachings. Nevertheless, ''[[nuees ardentes]]'' were described from the Azores in 1580. [[Georgius Agricola]] argued the rays of the sun, as later proposed by [[Descartes]] had nothing to do with volcanoes. Agricola believed vapor under pressure caused eruptions of 'mointain oil' and basalt.

Jesuit [[Athanasius Kircher]] (1602–1680) witnessed eruptions of Mount Etna 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.

[[Johannes Kepler]] considered volcanoes as conduits for the tears and excrement of the Earth, voiding bitumen, tar and sulfur. Descartes, pronouncing that God had created the Earth in an instant, declared he had done so in three layers; the fiery depths, a layer of water, and the air. Volcanoes, he said, were formed where the rays of the sun pierced the earth.

Science wrestled with the ideas of the combustion of [[pyrite]] with water, that rock was solidified bitumen, and with notions of rock being formed from water ([[Neptunism]]). Of the volcanoes then known, all were near the water, hence the action of the sea upon the land was used to explain volcanism.

=== Modern volcanology ===
Seismic observations are made using [[seismograph]]s deployed near volcanic areas, watching out for increased seismicity during volcanic events, in particular looking for long period harmonic tremors which signal [[magma]] movement through volcanic conduits.<ref name=Decker>Robert Decker and Barbara Decker, ''Volcanoes,'' 4th ed., W. H. Freeman, 2005, ISBN 0716789299 </ref>

Surface [[Deformation_Monitoring|deformation monitoring]] includes the use of geodetic techniques such as leveling, tilt, strain, angle and distance measurements through tiltmeters, total stations and EDMs. This also includes [[GNSS|GNSS observations]] and InSAR.<ref>Bartel, B., 2002. Magma dynamics at Taal Volcano, Philippines from continuous GPS measurements. Master's Thesis, Department of Geological Sciences, Indiana University, Bloomington, Indiana</ref><ref>G. Galgana et al., 2007, "[http://ees2.geo.rpi.edu/rob/pdf/2007_galgana_tectono.pdf Analysis of crustal deformation in Luzon, Philippines using geodetic observations and earthquake focal mechanisms]", ''Tectonophysics'', 432: 63–87.</ref> Surface deformation indicates magma upwelling: increased magma supply produces bulges in the volcanic center's surface.

Gas emissions may be monitored with equipment including portable ultra-violet spectrometers (COSPEC, now superseded by the miniDOAS) which analyzes the presence of [[volcanic gas]]es such as [[sulfur dioxide]]; or by infra-red spectroscopy (FTIR). Increased gas emissions, and more particularly changes in gas compositions, may signal an impending volcanic eruption.<ref name=Decker/>

Temperature changes are monitored using thermometers and observing changes in thermal properties of volcanic lakes and vents which may indicate upcoming activity.<ref name=Francis>Peter Francis and Clive Oppenheimer, ''Volcanoes'', Oxford University Press, USA 2003, 2nd ed., ISBN 0199254699 </ref>

Other [[Geophysics|geophysical techniques]] (electrical, gravity and magnetic observations) include monitoring fluctuations and sudden change in resistivity, gravity anomalies or magnetic anomaly patterns which may indicate volcano-induced faulting and magma upwelling.<ref name=Francis/>

[[Stratigraphy|Stratigraphic analyses]] includes analyzing [[tephra]] and lava deposits and dating these to give volcano eruption patterns, with estimated cycles of intense activity and size of eruptions.<ref name=Decker/>

==Famous volcanologists==
''See also [[:Category:Volcanologists]]''
*[[Plato]]
*[[Pliny the Elder]]
*[[Pliny the Younger]]
*[[Georges-Louis Leclerc, Comte de Buffon|George-Louis Leclerc, Comte de Buffon]] (1707-1788)
*[[James Hutton]] (1726-1797)
*[[Déodat Gratet de Dolomieu]] (1750-1801)
*[[David A. Johnston]], killed during the 1980 eruption of [[Mount St. Helens]]
*[[Katia and Maurice Krafft]], died at [[Mount Unzen]] in [[Japan]]
*[[Haroun Tazieff]], advisor to the [[French Government]] and [[Jacques Cousteau]]

==See also==
*[[GNS Science]] (formerly the Institute of Geological and Nuclear Sciences) (in New Zealand)
*[[Igneous rock]]
*[[List of publications in geology#Volcanology|Important publications in volcanology]]
*[[Tephrochronology]]
*[[Volcano Number]]

==References==
{{reflist}}

==External links==
* {{it icon}} [http://www.areavesuvio.org Area Vesuvio]
* [http://www.sveurop.org European Volcanological Society]
* [http://volcanoes.usgs.gov United States Geologic Survey- Volcanic Hazards Program]
* [http://www.volcanolive.com/volcanologist.html Volcano Live- What is a volcanologist?]
* [http://volcano.und.edu/vwdocs/how_to.html VolcanoWorld- How to become a volcanologist]
* {{cite journal |last=Strother |first=French |authorlink= |coauthors= |year=1915 |month=April |title=Frank A. Perret, Volcanologist |journal=[[World's_Work|The World's Work: A History of Our Time]] |volume=XXIX |issue= |pages=688-706 |id= |url=http://books.google.com/books?id=l_2rn8M7DSsC&pg=RA1-PA688 |accessdate=2009-08-04 |quote= }} and {{cite journal |last=Strother |first=French |authorlink= |coauthors= |year=1915 |month=May |title=Frank A. Perret, Volcanologist (Concluded) |journal=[[World's_Work|The World's Work: A History of Our Time]] |volume=XXX |issue= |pages=85-98 |id= |url=http://books.google.com/books?id=N69E9klDugUC&pg=PA85 |accessdate=2009-08-04 |quote= }}

[[Category:Volcanology| ]]
[[Category:Earth sciences]]

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[[bg:Вулканология]]
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[[el:Ηφαιστειολογία]]
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[[eu:Bulkanologia]]
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[[id:Vulkanologi]]
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[[ja:火山学]]
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[[tr:Yanardağbilimi]]
[[uk:Вулканологія]]
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About volcanology - Revision history

wikademia>Wikademia at 23:56, 14 September 2009

wikademia>Wikademia: from http://en.wikipedia.org/wiki/Volcanology