477
Our planet cries before each eruption
Hear the cry Zemli
In 2009, the year began erupting stratovolcano in the Aleutian Range in Alaska - a cloud of ash, sulfur dioxide and water vapor rises into the sky to a height of 20 km. This volcano called Redoubt erupts quite frequently, for example, in the 1999-2000 th years, he now and then erupted for six months, and lava flowed on the ground within a radius of 35 km around the volcano.
But in 2009, he studied the volcano seismologists have noticed something interesting - Volcano shouted before the eruption began.
Redoubt was the first volcano, where there was such a thing, but since then scientists pay attention to other volcanoes - many of them shouting, though not as much as the Redoubt. The fact that a few days before the eruption of the region observed seismic activity - small earthquakes have always preceded the eruption, it becomes a warning to people living in dangerous areas. But in the case of the redoubt from the ground could be heard humming.
When the researchers looked at the earthquake charts, they found a series of micro-earthquakes, followed one after the other. Gradually tremors involving up to 30 times per second. For comparison, the devastating eruption of Mount St. Helens in 1980 was the cause of only five shocks per second, and the case is considered the most deadly eruption in US history.
In the case of Mount Redoubt earthquakes were caused by a simultaneous increase in pressure along the fault lines inside the volcano. Pressure directed magma inside the crater of the volcano, and as a result there was friction, enough to appear shock waves - the faster they appeared, the louder became a howling sound. Deep in the bowels of the earth it sounds like the thing arising shriek, but on the surface of the sound is perceived as a barely audible hum.
It happened, and something else: for a few seconds before the actual eruption of the Earth completely silent. The researchers believe that the pressure at this time was the maximum, and the magma in this brief moment was able to break free. The friction was no more - and was not screaming. However, it was only the calm before the storm - this time the magma already raced to the crater of the volcano. In Alaska, as in the next two weeks went a fiery rain.
Listen to the cries of the planet. Just keep in mind: it is ... let's say, unnerving.
www.factroom.ru/facts/wp-content/uploads/2014/01/volcano_1.mp3
via factroom.ru
In 2009, the year began erupting stratovolcano in the Aleutian Range in Alaska - a cloud of ash, sulfur dioxide and water vapor rises into the sky to a height of 20 km. This volcano called Redoubt erupts quite frequently, for example, in the 1999-2000 th years, he now and then erupted for six months, and lava flowed on the ground within a radius of 35 km around the volcano.
But in 2009, he studied the volcano seismologists have noticed something interesting - Volcano shouted before the eruption began.
Redoubt was the first volcano, where there was such a thing, but since then scientists pay attention to other volcanoes - many of them shouting, though not as much as the Redoubt. The fact that a few days before the eruption of the region observed seismic activity - small earthquakes have always preceded the eruption, it becomes a warning to people living in dangerous areas. But in the case of the redoubt from the ground could be heard humming.
When the researchers looked at the earthquake charts, they found a series of micro-earthquakes, followed one after the other. Gradually tremors involving up to 30 times per second. For comparison, the devastating eruption of Mount St. Helens in 1980 was the cause of only five shocks per second, and the case is considered the most deadly eruption in US history.
In the case of Mount Redoubt earthquakes were caused by a simultaneous increase in pressure along the fault lines inside the volcano. Pressure directed magma inside the crater of the volcano, and as a result there was friction, enough to appear shock waves - the faster they appeared, the louder became a howling sound. Deep in the bowels of the earth it sounds like the thing arising shriek, but on the surface of the sound is perceived as a barely audible hum.
It happened, and something else: for a few seconds before the actual eruption of the Earth completely silent. The researchers believe that the pressure at this time was the maximum, and the magma in this brief moment was able to break free. The friction was no more - and was not screaming. However, it was only the calm before the storm - this time the magma already raced to the crater of the volcano. In Alaska, as in the next two weeks went a fiery rain.
Listen to the cries of the planet. Just keep in mind: it is ... let's say, unnerving.
www.factroom.ru/facts/wp-content/uploads/2014/01/volcano_1.mp3
via factroom.ru
A map of the most expensive cities in the world
Dubai police patrol the streets at McLaren, Lamborghini, Bentley and Ferrari