Seismic activity in the world in recent years is alarming: even relatively stable in terms of the tectonic regions, such as the American Yellowstone Park in Wyoming, USA, gives cause for concern. The so-called supervolcanoes, which concerns the Yellowstone, according to scientists, now pose a major threat. Any one of them has a catastrophic destructive.
It is believed that the Yellowstone supervolcano has a volume greater than 1,000 cubic kilometers. There are three known supervolcano eruption of this occurring at a frequency of about 600 thousand years — 2.1 million years ago, the next — about 1.2 million years ago, the last very large — 640 thousand years ago. There is reason to believe that the huge dormant volcano beneath Yellowstone National Park in the next few years to wake up. This is evidenced by the giant caldera — crater of the volcano, which occupies more than half of the national park. The red-hot magma beneath the surface began to rise in 1928 In recent years, scientists have noted a sharp increase in the rate rises, which may mean approaching the fateful hour. As Robert Smith (Bob Smith), a professor of geophysics at the University of Utah: "As long as the magma at a depth of about 10 km, and to sound the alarm early. But if it rises to the level of 2-3 km, we have a serious cause for concern. "
Speaking of our country, MSU professor of petrology Plechov Paul said that in 2007, scientists have identified a large cavity near Petropavlovsk-Kamchatsky, somewhat less Yellowstone caldera. Data on, there is little, but it is possible that this is also supervolcano.