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Seismologist Worried Over Yellowstone Volcano

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  • Samantha Synder
    Seismologist Indicate Serious Concern Over Yellowstone Volcano...08/09/03 by Mitch Battros (ECTV) Yellowstone plateau has been volcanically active for 2
    Message 1 of 1 , Aug 9, 2003
      Seismologist Indicate Serious Concern Over Yellowstone Volcano...08/09/03
      by Mitch Battros (ECTV)

      Yellowstone plateau has been volcanically active for 2 million years. It has
      been the scene of some of the world's largest
      eruptions. The Yellowstone caldera has one of the world's largest
      hydrothermal systems. The last large eruption was 70,000
      years ago. There are some who believe Yellowstone has a 70,000 to 80,000
      year cycle. Yes, that would mean at any time,
      Yellowstone could come alive.

      Yellowstone's world-famous natural history is marked by such colossal
      volcanic events that their reflections in today's
      landscape are difficult to grasp and impossible to take in at just a glance,
      even for those familiar with the signs of past

      The stunning features of Yellowstone National Park result from great
      explosive eruptions and profound collapse of the
      ground, enormously thick lava flows, uplift and extensive faulting, and the
      erosive power of flowing water and ice. For more
      than a century, geologists have discovered and analyzed evidence of the
      dramatic events that have shaped the land here.
      When combined with growing knowledge about how volcanoes work and the
      never-ending motion of Earth's surface, the
      evidence tells a remarkable story of the Yellowstone landscape.

      Saturday 9th August 2003
      It has been disclosed today, scientists plan to set up a temporary network
      of seismographs, Global Positioning System
      receivers and thermometers to monitor increasing hydrothermal activity in
      the Norris Geyser Basin and gauge the risk of a
      hydrothermal explosion. The goal of the Yellowstone Volcano Observatory is
      to pinpoint underground sources of
      hydrothermal steam and learn more about how seismic activity affects the

      Scientists do not expect a volcanic eruption. However, small hydrothermal
      explosions occur in the park almost every year.
      Usually they are not noticed until after the fact. The Norris Back Basin has
      been closed since July 23 due to the formation of
      new mud pots, changes in geyser activity and much higher ground
      temperatures, as hot as 200 degrees in some areas.
      Vegetation has been dying due to thermal activity and altered eruption
      intervals for several geysers. Increased steam
      discharge has been continuing, according to park officials. Hydrothermal
      activity has been increasing each year in the basin,
      but the increase in recent weeks has been especially rapid.

      The volcanism most directly identified with the Yellowstone region has,
      during about the past 2 million years, built an immense
      volcanic plateau that straddles a high mountain divide--the Yellowstone
      Plateau volcanic field. This volcanic region has
      evolved through 3 cycles of voluminous outpourings of rhyolite lava and
      volcanic ash, each of them climaxing with one of
      Earth's greatest pyroclastic-flow eruptions and the resulting collapse of a
      central area to form a large caldera. Other eruptions
      have poured out basalt lava flows around the margins of the volcanic field.

      Yellowstone's volcanism is only the most recent in a 17 million-year history
      of volcanic activity that has occurred
      progressively from southwestern Idaho to Yellowstone National Park. At least
      six other large volcanic centers along this path
      generated caldera-forming eruptions; the calderas are no longer visible
      because they are buried beneath younger basaltic lava
      flows and sediments that blanket the Snake River Plain.

      Thought For The Day

      "We do not so much need the help of our friends as the confidence of their
      help when in need."

      - The
      Vatican Sayings, Epicurus

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      Mitch Battros
      Producer - Earth Changes TV

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