Death Valley’s volcanic superblast: Scientists find another potential ticking time-bomb in the U.S.

January 24, 2012CALIFORNIAIn California’s Death Valley, death is looking just a bit closer. Geologists have determined that the half-mile-wide Ubehebe Crater, formed by a prehistoric volcanic explosion, was created far more recently than previously thought—and that conditions for a sequel may exist today. Up to now, geologists were vague on the age of the 600-foot deep crater, which formed when a rising plume of magma hit a pocket of underground water, creating an explosion. The most common estimate was about 6,000 years, based partly on Native American artifacts found under debris. Now, a team based at Columbia University’s Lamont-Doherty Earth Observatory has used isotopes in rocks blown out of the crater to show that it formed just 800 years ago, around the year 1200. That geologic youth means it probably still has some vigor; moreover, the scientists think there is still enough groundwater and magma around for another eventual reaction. The study appears in the current issue of the journal Geophysical Research Letters. Ubehebe (YOU-bee-HEE-bee) is the largest of a dozen such craters, or maars, clustered over about 3 square kilometers of Death Valley National Park. The violent mixing of magma and water, resulting in a so-called phreatomagmatic explosion, blew a hole in the overlying sedimentary rock, sending out superheated steam, volcanic ash and deadly gases such as sulfur dioxide.
Study coauthor Brent Goehring, (now at Purdue University) says this would have created an atom-bomb-like mushroom cloud that collapsed on itself in a donut shape, then rushed outward along the ground at some 200 miles an hour, while rocks hailed down. Any creature within two miles or more would be fatally thrown, suffocated, burned and bombarded, though not necessarily in that order. “It would be fun to witness—but I’d want to be 10 miles away,” said Goehring of the explosion. The team began its work after Goehring and Lamont-Doherty professor Nicholas Christie-Blick led students on a field trip to Death Valley. Noting that Ubehebe remained poorly studied, they got permission from the park to gather some 3- to 6-inch fragments of sandstone and quartzite, part of the sedimentary conglomerate rock that the explosion had torn out. In the lab, Goehring and Lamont-Doherty geochemist Joerg Schaefer applied recent advances in the analysis of beryllium isotopes, which change their weight when exposed to cosmic rays. The isotopes change at a predictable rate when exposed. -Physics
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6 Responses to Death Valley’s volcanic superblast: Scientists find another potential ticking time-bomb in the U.S.

  1. SeriousSneep says:

    Living in California myself, I am curious if any of the tremors we have been seeing are anywhere around there. Interesting that they bring this up now durring an uptick of Vulcanism and earthquakes globally. Guess those geologist have been busy taking a second look at a lot of places they passed over and said… Nahhhh.

  2. Birdie says:

    I think this is just more evidence that these types of event happen regularly. Escaping gas or magma under pressure causing a major explosion. I do believe this is the cause of the Tunguska event – NOT a “meteorite.”

    • Irene C says:

      I agree Birdie. I know there have been a lot of studies done on the Tunguska event, but I feel that a major explosion was the cause. I also feel that more geologist and volcanologists are beginning to agree and follow up on these past events. The frightening part is that these events can happen again.

      Maranatha

  3. Joe Applegate says:

    Many of the landforms present in the western US are volcanic in origin and much more recent than the age of dinosaurs… for instance, the river of fire in southern new mexico, was so named by the native inhabitants of the region because their ancestors SAW the flowing lava., agate fossil beds of nebraska contains fossils of mammals caught in an ash cloud a mere 10 million years ago from an eruption in western wyoming, The southern mountains of colorado, includinfnnis the west elks near Gunnisen and the san juans near durango are all volcanos which have errunpted since the dinosurs roamed the earth. yes and by the way the Tanguska event is not a metorite most sciantists consider it a cometary impact where the bolide disintegrated in the atmoshere.

  4. Billsocal says:

    The volcano is close to Hawthorn, Nevada were there was swarms of earthquakes last year. Are the earthquakes link to this volcano or Longs Valley Caldera. There is another volcano between this one are Longs Valley Caldera. It is call Cosco.. This is 2012 . Does that have anything to do with it the end of times.

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