|17 Apr 2005 @ 02:36, by Salama Shaquana|
There are more and more stories appearing around the globe about possible eruption. Even down here in Australia scientist are watching a number of places that millions of years ago were active volcanos. These sites have been ‘dead’ for millions of years – so it begs the question why the concern now? Should we be worried?
The following is also a story of interest.
By CAROLE CLOUDWALKER
Beneath the serene surface of Yellowstone Lake, where death from hypothermia comes within 30 minutes, seethes a boiling underwater world.
And like a pot too long on the stove, it could boil over, says U.S. Geological Survey geologist Lisa Morgan, Ph.D., of Colorado.
She and others from the USGS have been studying the hottest hot spot in the 7,731-foot elevation lake, a spot which Morgan has termed an "inflated plain." It lies south-southwest of Storm Point near Mary Bay, in the northern end of the lake.
Morgan, representing both the USGS and Yellowstone Volcanic Observatory, is in the process of mapping the lake floor with seismic reflection images. She uses a sonar system that emits sound waves. Morgan has taken 240 million soundings in the last four years.
She has found that temperatures along the inflated plain have been recorded at about 85 degrees 60 feet down, where the plain bulges up about 100 feet above the lake floor. (Park spokesman Cheryl Matthews says the lake rarely reaches more than 66 degrees at the surface by late summer, and is much colder deeper down.) The inflated plain stretches 2,100 feet - about the length of seven football fields - across.
"We think this is very young," something that occurred in the last few years, Morgan said.
"We're thinking this structure could be a precursor to an hydrothermal explosive event," Morgan said last week. "But we don't think this is a volcano."