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A volcanologist sampling lava using a rock hammer and a bucket of water
Eruption of Stromboli (Isole Eolie/Italia), ca. 100m (300ft) vertically. Exposure of several seconds. The dashed trajectories are the effectof lava pieces with a bright hot side and a cool dark side rotating in mid-air.

Volcanology (also spelled vulcanology) is the study of volcanoes, lava, magma and related geological, geophysical and geochemical phenomena (volcanism). The term volcanology is derived from the Latin word vulcan. Vulcan was the ancient Roman god of fire.

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

Modern volcanology

Volcanologist examining tephra horizons in south-central Iceland.
A diagram of a destructive plate margin, where subduction fuels volcanic activity at the subduction space of tectonic plate boundaries.

In 1841, the first volcanological observatory, the Vesuvius Observatory, was founded in the Kingdom of the Two Sicilies.

Seismic observations are angry using seismographs deployed near volcanic location, watching out for increased seismicity during volcanic happening, in particular looking for long period harmonic tremors, which signal magma movement through volcanic conduits.

Surface deformation monitoring contain the utilizeof geodetic techniques such as leveling, tilt, strain, angle and distance measurements through tiltmeters, total stations and EDMs. This also contain GNSS observations and InSAR. 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Gas emissions may be monitored with equipment including portable ultra-violet spectrometers (COSPEC, now superseded by the miniDOAS), which analyzes the presence of volcanic gases such as sulfur dioxide; or by infra-red spectroscopy (FTIR). Increased gas emissions, and more particularly modify in gas compositions, may signal an impending volcanic eruption.

Temperature modify are monitored using thermometers and observing modify in thermal properties of volcanic lakes and vents, which may indicate upcoming activity.

Satellites are widely utilize to monitor volcanoes, as they leta hugelocationto be monitored easily. They shouldmeasure the spread of an ash plume, such as the one from Eyjafjallajökull's 2010 eruption, as well as SO2 emissions. InSAR and thermal imaging shouldmonitor large, scarcely populated location where it would be too expensive to maintain instruments on the ground.

Other geophysical techniques (electrical, gravity and magnetic observations) containmonitoring fluctuations and sudden modifyin resistivity, gravity anomalies or magnetic anomaly patterns that may indicate volcano-induced faulting and magma upwelling.

Stratigraphic analyses contain analyzing tephra and lava deposits and dating these to give volcano eruption patterns, with estimated cycles of intense activity and size of eruptions.


Volcanology has an extensive history. The earliest known recording of a volcanic eruption may be on a wall painting dated to about 7,000 BCE found at the Neolithic pageat Çatal Höyük in Anatolia, Turkey. This painting has been interpreted as a depiction of an erupting volcano, with a cluster of houses below present a twin peaked volcano in eruption, with a cityat its base (though archaeologists now question this interpretation). The volcano may be either Hasan Dağ, or its smaller neighbour, Melendiz Dağ.

Greco-Roman philosophy

Eruption of Vesuvius in 1822. The eruption of CE 79 would have appeared very similar.

The classical globeof Greece and the early Roman Empire explained volcanoes as page of various gods. Greeks considered that Hephaestus, the god of fire, sat below the volcano Etna, forging the weapons of Zeus. The Greek word utilize 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 giant Enceladus was buried beneath Etna by the goddess Athena as punishment for rebellion versusthe gods; the mountain's rumblings were his tormented cries, the flames his breath and the tremors his railing versusthe bars of his prison. Enceladus' brother Mimas was buried beneath Vesuvius by Hephaestus, and the blood of other defeated giants welled up in the Phlegrean Fields surrounding Vesuvius.

The Greek philosopher Empedocles (c. 490-430 BCE) saw the globedivided 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 globes volcanoes. Aristotle considered underground fire as the effectof "the...friction of the victory when it plunges into narrow passages."

Victory played a key role in volcano explanations until the 16th century. Lucretius, a Roman philosopher, claimed Etna was completely hollow and the fires of the underground driven by a fierce victory circulating near sea level. Ovid trust that the flame was fed from "fatty meal" and eruptions stopped when the mealran 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 CE 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 result of toxic gases. Such eruptions have been named Plinian in honour of the two authors.

Renaissance observations

After the first eruption of Mount St. Helens on May 18, five more explosive eruptions occurred in 1980, including this happeningon July 22. This eruption sent pumice and ash 6 to 11 miles (10-18 kilometers) into the air, and was visible in Seattle, Washington, 100 miles (160 kilometers) to the north. The view here is from the south.

Nuées 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 trust 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 madethe 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 utilize to explain volcanism.

Interaction with religion and mythology

Pele's hair caught on a radio antenna mounted on the south rim of Puʻu ʻŌʻō, Hawaiʻi, July 22, 2005

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 battleensued. Māori will not to this day live between Tongariro and Taranaki for fear of the dispute flaring up again.[citation needed]

In the Hawaiian religion, Pele (/ˈpeɪleɪ/ Pel-a; [ˈpɛlɛ]) is the goddess of volcanoes and a famousfigure in Hawaiian mythology. Pele was utilize for various scientific rulesas for Pele's hair, Pele's tears, and Limu o Pele (Pele's seaweed). A volcano on the Jovian moon Io is also named Pele.

Saint Agatha is patron saint of Catania, close to mount Etna, and an necessaryhighly venerated (till today) example of virgin martyrs of Christian antiquity. In 253 CE, one year after her violent death, the stilling of an eruption of Mt. Etna was attributed to her intercession. Catania was however nearly completely destroyed by the eruption of Mt. Etna in 1169, and over 15,000 of its inhabitants died. Nevertheless, she was invoked again for the 1669 Etna eruption and, for an outbreak danginering Nicolosi in 1886. The methodshe is invoked and dealt with in Italian Folk religion, a sort of quid pro quo methodapproach to saints, has been related (in the tradition of James Frazer) to earlier pagan trust.

In 1660 the eruption of Vesuvius rained twinned pyroxene crystals and ash upon the nearby villages. The crystals resembled the crucifix and this was interpreted as the work of Saint Januarius. In Naples, the relics of St Januarius are paraded through cityat every major eruption of Vesuvius. The register of these processions and the 1779 and 1794 diary of Father Antonio Piaggio permittedBritish diplomat and amateur naturalist Sir William Hamilton to provide a detailed chronology and description of Vesuvius' eruptions.

Notable volcanologists

Spanish depiction of a volcanic eruption in Guatemala, 1775.


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