Undersea volcano (Mobius version) (AngieYaz Sonic Underground reboot)

Submarine volcanoes are underwater vents or fissures in Mobius' surface from which magma can erupt. Many submarine volcanoes are located near areas of tectonic plate formation, known as mid-ocean ridges. The volcanoes at mid-ocean ridges alone are estimated to account for 75% of the magma output on Mobius. Although most submarine volcanoes are located in the depths of seas and oceans, some also exist in shallow water, and these can discharge material into the atmosphere during an eruption. The Kolumbo submarine volcano in the Aegean Sea was discovered in 1650 when it erupted, killing about 70 people on the nearby island of Santor. The total number of submarine volcanoes is estimated to be over 1 million (most are now extinct) of which some 75,000 rise more than 1 km above the seabed. Only 119 submarine volcanoes in Mobius' oceans and seas are known to have erupted during the last 11,700 years.
Hydrothermal vents, sites of abundant biological activity, are commonly found near submarine volcanoes on Movius.
==Effect of water on volcanoes==
On Mobius, just as on any terrestrial planet, the presence of water can greatly alter the characteristics of a volcanic eruption and the explosions of underwater volcanoes in comparison to those on land.
For instance, water causes magma to cool and solidify much more quickly than in a terrestrial eruption, often turning it into volcanic glass. The shapes and textures of lava formed by submarine volcanoes are different from lava erupted on land. Upon contact with water, a solid crust forms around the lava. Advancing lava flows into this crust, forming what is known as pillow lava.
Below ocean depths of about 2200 m, where the pressure exceeds the critical pressure of water (22.06 MPa or about 218 atmospheres for pure water), it can no longer boil; it becomes a supercritical fluid. Without boiling sounds, deep-sea volcanoes can be difficult to detect at great distances using hydrophones.
The critical temperature and pressure increase in solutions of salts, which are normally present in the seawater. The composition of aqueous solution in the vicinity of hot basalt, and circulating within the conduits of hot rocks, is expected to differ from that of bulk water (i.e., of sea water away from the hot surfaces). One estimation is that the critical point is 407 °C and 29.9 MPa, while the solution composition corresponds to that of approximately 3.2% of NaCl.
==Seamounts==
Many submarine volcanoes are seamounts, typically extinct volcanoes that rise abruptly from a seafloor of 1,000 - 4,000 meters depth. They are defined by oceanographers as independent features that rise to at least 1,000 meters above the seafloor. The peaks are often found hundreds to thousands of meters below the surface, and are therefore considered to be within the deep sea. An estimated 30,000 seamounts occur across the globe, with only a few having been studied. However, some seamounts are also unusual. For example, while the summits of seamounts are normally hundreds of meters below sea level, the Bowton Seamount in Canadius' Paci waters rises from a depth of about 3,000 meters to within 24 meters of the sea surface.
==Identifying types of eruptions by sounds==
There are two types of sound generated by Mobian submarine eruptions: One created by the slow release and bursting of large lava bubbles, while the other one is created by quick explosions of gas bubbles. Using this method to be able to distinguish the two can help measure the related affects on marine animals and ecosystems, the volume and composition of the lava flow can also be estimated and built into a model to extrapolate potential effects.
Scientists have been able to connect sounds to sights in both types of eruptions. One year, a video camera and a hydrophone were floating 1,200 meters below sea level in the Paci Ocean near Samoa, watching and listening as the West Mata Volcano erupted in several ways. Putting video and audio together let researchers learn the sounds made by slow lava bursting and the different noises made by hundreds of gas bubbles.
Category:AngieYaz Sonic Underground reboot
Category:Mobius
Category:Seas, lakes and oceans
Category:Volcanoes
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