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Keywords searched: 13

  1. Atlantic Tsunami?
  2. Crumbling Volcano Threatens Atlantic, Caribbean Coastlines
  3. How do you find out what causes the tsunami? i know valcanos, under water landslides and easthquakes, but how do you know which one starts it ?
  4. What gear do you use to study tsunamis?
  5. When you tell people to evacuate; how long do you have until the tsunami hits?
  6. What if the tsunami warning is too late? Is it possible to stay at your home and survive the tsunami?
  7. Where are most tsunami's active and can you get one in one of the Great Lakes?

  1. Atlantic Tsunami?

    Usually, tsunamis are generated by underwater earthquakes; sometimes the earthquake will trigger an underwater landslide that can add to the height of a tsunami. For example, in 1929, a magnitude 7.2 earthquake near the Grand Banks triggered an underwater landslide and tsunami that caused 51 fatalities in Newfoundland. Such earthquakes on the east coast are rare. Recently, scientists did discover evidence that underwater landslides MAY have occurred off the east coast in the past. If true, this suggests that such slides may also occur in the future, perhaps triggered by a rare east coast earthquake, and perhaps accompanied by a tsunami. So such an event may be possible, and prudence demands the hazard assessment that the east coast scientists plan to conduct, even though the probability of such an event is still considered very low

    For more information about Atlantic tsunamis please contact:

    Paula Dunbar,
    NOAA, National Geophysical Data Center,
    E/GC2 325 BROADWAY, BOULDER, CO 80305-3328
    PH: (303)497-6084 FAX:(303)497-6513
    Internet Address: paula.dunbar@noaa.gov



    Authority: Dr. Frank Gonzalez, NOAA Center for Tsunami Research

  2. Crumbling Volcano Threatens Atlantic, Caribbean Coastlines

    Scientists from University College London issued warnings that the flank of a volcanic island in the eastern Atlantic is at risk of collapsing and generating a wave up to 160 feet high that could swamp the coastlines of the Caribbean and eastern Florida.

    Simon Day of the college's Hazard Research Center wrote in New Scientist that a huge chunk of La Palma, the most volcanically active island in the Canaries, is now unstable. "If the flank of the volcano slides into the ocean, the mass of moving rock will push the water in front of it, creating a tsunami wave far larger than any seen in history," said Day. "The wave would then spread out across the Atlantic at the speed of a jet airliner until it strikes coastal areas all around the North Atlantic."

    Day identified scores of volcanic vents in the 7,957-foot-high Cumbre Vieja Volcano that comprises the southern half of the island of La Palma. He determined that the western flank of the mountain, a mass of approximately 500 billion tons of rock, is slowly detaching itself as volcanic activity forces magma to the top of the volcano. A major volcanic explosion could cause the flank to detach and fall into the sea with catastrophic effects.

    Simon Day - (s.day@ucl.ac.uk)
    The Benfield Hazard Research Centre,
    Research School of Geological and Geophysical Sciences
    University College London
    -- Currently (2005.01.03) --
    Visiting associate researcher at University of California Santa Cruz.
    Tel +1-831-459-5143
    Fax +1-831-459-3074
    Email sday@es.ucsc.edu

    For more information about Atlantic tsunamis please contact:
    Paula Dunbar,
    NOAA, National Geophysical Data Center, E/GC2
    325 BROADWAY
    BOULDER, CO 80305-3328
    PH: (303)497-6084
    FAX:(303)497-6513
    Internet Address: paula.dunbar@noaa.gov



    Authority: NOAA Center for Tsunami Research

  3. How do you find out what causes the tsunami? i know valcanos, under water landslides and easthquakes, but how do you know which one starts it ?

    Actually, it is often very hard to tell about the details of how a tsunami was generated when a volcanic eruption or earthquake also caused an underwater landslide. Surveys by scientists after a tsunami often show evidence of recent landslides near the source. Computer models are then used to estimate how much of the tsunami was generated as the ground moved during the eruption (or earthquake) and how much could have been due to the landslide. This is assuming that the even t did cause the landslide. There are always uncertainties in the conclusions.

    Authority: Dr. Hal Mofjeld, interview in February 13, 2006, NOAA Center for Tsunami Research

  4. What gear do you use to study tsunamis?

    The equipment and methods used to evaluate a tsunami include bottom imaging (TV and sound-generated) equipment, water depth sounders, bottom samplers, earthquake (seismic) instruments (the data they recorded during an event), land-surveying equipment to survey the flooding by the tsunami, tide gages in harbors (their records of the tsunami) and computers to process the data and run computer models of the tsunami.

    Authority: Dr. Hal Mofjeld, interview in February 13, 2006, NOAA Center for Tsunami Research

  5. When you tell people to evacuate; how long do you have until the tsunami hits?

    For a dangerous tsunami has been generated far away from an area, the NOAA Tsunami Warning Centers issue a tsunami watch that a dangerous tsunami may be on its way and for people to be alert for further information. A tsunami warning is issued at least 2 hours before the first wave will strike the area. The warning tells people to move to a safe place as quickly as possible.

    When a tsunami is generated nearby, a tsunami warning is issued immediately. For this case, people near the ocean should also u se the natural warning signs such as a strong earthquake, the water level starts changing rapidly, or there is a new loud sound coming from the ocean.

    Authority: Dr. Hal Mofjeld, interview in February 13, 2006, NOAA Center for Tsunami Research

  6. What if the tsunami warning is too late? Is it possible to stay at your home and survive the tsunami?

    Moving to high ground away from the water before the first tsunami wave strikes is the best approach. If that is not possible, then a well-constructed multi-story building may provide a haven to shelter in place. However, such structures are rare in many coastal areas

    Authority: Dr. Hal Mofjeld, interview in February 13, 2006, NOAA Center for Tsunami Research

  7. Where are most tsunami's active and can you get one in one of the Great Lakes?

    Most of the recent tsunamis have occurred in the Pacific Ocean and Indonesian Region, but they also occur in the Mediterranean Sea. There is a history of tsunamis in the Great Lakes. These are described at the website of NOAA's National Geophysical Data Center ( http://www.ngdc.noaa.gov/seg/hazard/tsu_db.shtml). If you go to the website and then click on 'EAST COAST of the UNITED STATES and CANADA', it will show you a list of tsunami events that include the Great Lakes.

    Authority: Dr. Hal Mofjeld, interview in February 13, 2006, NOAA Center for Tsunami Research