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BOGOTA, Colombia (AP) — Colombia's Nevado del Huila volcano erupted in a shower of hot ash, prompting thousands of people to leave their homes on Tuesday.
Smoke rises from the Chaiten volcano, May 2, 2008. The volcano in southern Chile spewed ash before dawn on Friday, triggering tremors 12 miles away and prompting evacuations, officials said.
The Chaiten volcano last erupted more than 9,000 years ago, throwing out millions of tons of material and creating a crater two miles wide.
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Experts believe that magma has been trickling through the crust into a chamber beneath Chaiten, increasing the pressure as more of the liquid rock and gas filled the void left by the last explosion.
This week’s eruption was caused by magma forcing its way up through the crust beneath the volcano.
Scientists in Chile are now frantically collecting data in an attempt to measure how much magma has built up under the volcano.
"This could be an isolated incident or the start of quite a long period of rumbling," said Prof Clive Oppenhiemer, a volcanologist at Cambridge University.
Chaiten is a caldera volcano, which can explode in a cataclysmic eruption, emptying the magma chamber and causing the dome and surrounding land to collapse into the void beneath.
PUERTO MONTT, Chile (AFP) — A volcano in southern Chile erupted with renewed vigor Tuesday, raining ash and lava over its surroundings and forcing a total evacuation in a 30-kilometer (19-mile) radius, the National Emergency Office said.
APRIL 2008 Yellowstone Seismicity Summary
During the month of April 2008, 70 earthquakes were located in the Yellowstone Region. The largest of these shocks was a magnitude 1.7 event on April 17, 2008 at 6:56 AM MST, located about 13 miles North Northwest of Pahaska Tepee, WY and 19 miles North East of Fishing Bridge, WY. This earthquake was not felt. There were no earthquake swarms. Earthquake activity in the Yellowstone region is at relatively low background levels.
Earthquake activity in the Yellowstone region is at normal background levels.
Ground Deformation Summary: Through April 2008, continuous GPS data show that most of the Yellowstone caldera continued moving upward at similar to slightly lower rates as the past year. The maximum measured ground uplift over the past 40 months is ~20 cm at the White Lake GPS station. An example can be found at: pboweb.unavco.org...
The general uplift of the Yellowstone caldera is scientifically interesting and will continue to be monitored closely by YVO staff.
An article on the current uplift episode at Yellowstone and discussion of long-term ground deformation at Yellowstone and elsewhere can be found at: volcanoes.usgs.gov...
You would have over nine inches of ash over 1,000 miles away. The area effected by the blast would be more than 2,000 square miles. And when this one blows, it will be 2500 times bigger than Mt. St. Helens. And where is it? Some of you might have actually walked through it. Its Yellowstone National Park, in the north-western region of the United States.
what will happen when Yellowstone does blow. Well, it wont be pretty. There will be significant ash deposits over two-thirds of the country. The massive amounts of ash, dust, and gases will cause seriously reduced amounts of sunlight to reach the Earths surface for an extended amount of time. There will be massive loss of life, loss of animals and plants and possible extinctions, crops would fail all over the planet, and we would find ourselves living in a mini-Ice Age for at least several years.