Volcanologists monitoring Pavloff and Cleveland volcanoes in Alaska.
In Alaska, scores of volcanoes and strange lava flows have escaped scrutiny for decades, shrouded by lush forests and hidden under bobbing coastlines.
In the past three years, 12 new volcanoes have been discovered in Southeast Alaska, and 25 known volcanic vents and lava flows re-evaluated, thanks to dogged work by geologists with the U.S. Geological Survey (USGS) and the U.S. Forest Service. Sprinkled across hundreds of islands and fjords, most of the volcanic piles are tiny cones compared to the super-duper stratovolcanoes that parade off to the west, in the Aleutian Range.
But the Southeast's volcanoes are in a class by themselves, the researchers found. A chemical signature in the lava flows links them to a massive volcanic field in Canada. Unusual patterns in the lava also point to eruptions under, over and alongside glaciers, which could help scientists pinpoint the size of Alaska's mountain glaciers during past climate swings.
"It's giving us this serendipitous window on the history of climate in Southeast Alaska for the last 1 million years," said Susan Karl, a research geologist with the USGS in Anchorage and the project's leader. (Image Gallery: Alaska's New Volcanoes)
Canada? That's a big magma chamber.
Last edited by LadyStanley: 06-08-2013 at 08:44 PM.