Monday, August 13, 2007

UNDERSEA VOLCANOS.

http://es.youtube.com/watch?v=ROvVc6TFVuc


Left: Hole of an undersea Java volcano (Science Dayly).


If we count all types of volcanos we will found with surprise, that undersea volcanos are much more frequent that those of mainland. What really happens is that submarine volcanos (within them: Krause, Masaya, Black Mountain,Soufriere Hills/America, Dyiragongo, Erta Ale, Ol Doinyo Lengal/Africa), rarely are observed in regard to the pressure of the water that tends to attenuate its eruptions maintaining them outside the reach of our watching. However the gigantic eruption of a submarine volcano in Indonesia/Java, that caused 13 human deaths and extensive material damage (2006), has put on alert to the inhabitants of Trinidad island (to 11 km of the northwest coast of Venezuela, 1 million inhabitants, 4768 km2), because a recently discovered submarine volcano could explode before its coasts, flooding with volcanic mud its coastal areas. Trinidad was sometimes part of South America until 2000 years ago when the ascent of marine waters submerged the marine platform on which the island rises. The present volcano (to see photos in Die Welt online), was discovered by trinitaries fishermen that describe it like total eruptions of mud and gas. The Eastern area of Trinidad also displays terraqueous raising in continuous growth. In May these elevations reached 12 ms of height and a width of 150 ms. “It is going to grow and to grow before explode”, say some inhabitants of Mayaro.The eruption spilled to the sea acid and mud rich in dioxide of sulfur and methane, the same that combined with water, produce sulfuric acid and sulfur, generating acid eyections”, say William Chadwick, of the University of Oregon. By his side Roderick Stewart, sismologist of the University of West Indies, says “there is no lava, is no magma” diminishing possible dangers...it is methane to pressure that escapes of layers near the surface…...but down single there is little heat and energy”.

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