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Quietness terrible eruption

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The last eruption of Etna should not frighten nor sitsiliytsev nor tourists, collects "visit to the mafia". The terrible lack of eruptions. Many scientists believe that Etna is gradually moving to the type of explosive volcanic activity. Etna is a type of stratovulkanov - usually high and steep volcanic formations in which a narrow vents on top rises particularly dense and viscous magma. In the case of Sicilian volcano it has a lot of options, which filed more. Here there are several craters, each of which activity is dimming, the raspalyaetsya again. Sam volcano, as a separate mountain, the samples to light only less than half a million years ago, but geologists believe that preparations for the lasted about a half million years, during much of the Pleistocene epoch. A long time here attended thyroid volcano, which is less viscous lava widely spreads on sloping slopes and largely formed the very Sicily. Some scientists believe that the change in the type of volcanic activity occurring in recent decades. May 10 eruption was the centre of south-eastern crater, which is less than forty years. This volcanic bowl came only after large-scale eruption in 1971, when struck hard vaults "safety valve" in the south-eastern slope of the central crater, which during the eruption of the will vyryvalis volcanic gases, steam and ash. The eruption ended, gas pressure fell, and under its own weight "safety valve" hit. Seven years is a place with the mind remained no more than a volcanic pit, topographic monument eruption in 1971 and destroyed them Observatory, in which the XIX century, scientists have been monitoring the air (she was one of the European centres studying variable stars) and most active volcano. However, in late 1970 - ies of the new crater awakened, and since then the volcanic cone around it, then up, then slightly destroyed, grew by nearly 300 meters, making at the end of 1990 - ies breakthrough in almost 100 metres for a couple of years. It is south-east crater has become the center of the last two powerful eruptions of Etna autumn 2007, hence it grows recent lava fountains, raised above the volcano. And, until these fountains beat, you can not nervous: lava could still freely Disembogue from the volcano vents. Seriously think about the trip to Sicily will be needed on the day when the earthquake, his stunning slopes, no longer will accompany eruptions. This means that the subsoil earth again began to save power.
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