Because St . Helens was also the first massive eruption in a developed country within driving distance of a number of major universities, it is unrivaled as a model for ecosystem recovery.
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As the sun set Tuesday on Mount Usu, clouds of thick black smoke poured from of one of its gaping craters, and scientists warned that a massive eruption could be brewing.
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The flares _ massive eruptions of hydrogen from the sun's surface _ were observed by researchers at the National Solar Observatory in southern New Mexico on the morning of Oct . 31.
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The featured article 1980 eruption of Mount St . Helens describes, in great detail, the massive eruption of the Mount St . Helens volcano in Washington state on May 18, 1980.
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Montserrat government Saturday urged die-hards to abandon homes endangered by the Soufriere Hills volcano, warning of an imminent, massive eruption that could cause a tidal wave that might affect other islands.
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The massive eruptions 200 million years ago tore apart the ancient continent of Pangea and may have caused a mass extinction of animals, the researchers report in Friday's issue of the journal Science.
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Volcanic material that smothered the city spewed out from the massive eruption, which blew out much of the middle of the island in 17th Century B . C ., sending ash as far as Greenland.
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The massive eruption of Toba supervolcano that occurred some time between 69, 000 and 77, 000 years ago instigated the Toba catastrophe theory, a global volcanic winter that caused a bottleneck in human evolution.
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In 1980, a massive eruption of Mount St . Helens in southwestern Washington killed 57 people, dumped tons of ash on towns across the region and set off one of the most powerful landslides in history.
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Though there is no well-defined minimum explosive size for a " supervolcano ", there are at least two types of volcanic eruptions that have been identified as supervolcanoes : large igneous provinces and massive eruptions.
