Wyatt earp
Diamond Member
- Apr 21, 2012
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It may seem surprising that there's a growing baby glacier in Washington State, but its location is even more surprising: inside the steaming caldera of Mt. St. Helens itself! When St. Helens was still a placid Fuji-like cone, it was covered with a dozen small glaciers, but that all ended on May 18, 1980, when the top 1,300 feet of the mountain were blown off in a massive eruption of rock and lava. It was the largest landslide in recorded human history.
A new glacier rises from the ashes.
When the dust settled, the summit of Mt. St. Helens was a horseshoe-shaped ridge, a shadow of its former self. But speaking of shadows: the new horseshoe opens to the north, which means a lot of the crater is well-shaded from the sun. By 1988, there was snow and ice in the crater year-round, and by 1996 it was carving crevasses into the crater rim—making it, by definition, a glacier. The flowing layers of ice and rock were soon 660 feet deep....
Snip
In 2004, a second, slower eruption began at Mt. St. Helens, and geologists assumed that the new ice field would melt, causing new mudslides. In fact, the opposite happened. Amazingly, the hot magma pushed up a 900-foot-high dome inside the crater, shielding the baby glacier even more effectively. All winter, snow and ice slides down the crater rim into the glacier, so it's still expanding...
Amid Global Warming, North America Has a New Glacier
A new glacier rises from the ashes.
When the dust settled, the summit of Mt. St. Helens was a horseshoe-shaped ridge, a shadow of its former self. But speaking of shadows: the new horseshoe opens to the north, which means a lot of the crater is well-shaded from the sun. By 1988, there was snow and ice in the crater year-round, and by 1996 it was carving crevasses into the crater rim—making it, by definition, a glacier. The flowing layers of ice and rock were soon 660 feet deep....
Snip
In 2004, a second, slower eruption began at Mt. St. Helens, and geologists assumed that the new ice field would melt, causing new mudslides. In fact, the opposite happened. Amazingly, the hot magma pushed up a 900-foot-high dome inside the crater, shielding the baby glacier even more effectively. All winter, snow and ice slides down the crater rim into the glacier, so it's still expanding...
Amid Global Warming, North America Has a New Glacier