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          Tsunami!
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    What happened & why
   2004 Indian Ocean Earthquake

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         – Second level             earthquake
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                – Fourth level      •Magnitude 9.0
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                                    (Moment magnitude
                                    scale)



NOAA
Epicenter 150 KM west of Sumatra

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http://en.wikipedia.org/wiki/2004_Indian_Ocean_earthquake
   Occurred along the subduction
    zone where the Indian dives
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http://www.nps.gov/prsf/geology/images/plates.gif
                   Facts
• The earthquake came just three days after
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  a magnitude 8.1 earthquake in an
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  uninhabited region west of New Zealand
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• Possible connection between these two
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  earthquakes
• Possibility of a seismic chain reaction across
  neighboring plates has also been
  considered
                   Facts
• Total energy released by a magnitude 9.0
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  earthquake exceeds the total amount of
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  energy consumed in the U.S. in one month
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                           of
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  insignificantly altered the Earth's rotation
A tsunami (pronounced soo-
NAA-mee) is a series of waves
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    –(called a "wave train")
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   by a pulsating or abrupt
  disturbance that vertically
 displaces the water column.
   Tsunami's are also mistakenly
referred to as tidal waves as they
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      – resemble
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rising,• ratherlevel
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when they» reach shore. However,
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as they are not actually related to
tides the term may be misleading,
   and its use is discouraged by
                      scientists.
                                            Tsunamis are
                                            created when:
                              •Seafloor
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           – Second level                   changes shape
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                        – Fourth level      •Water is displaced
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                                            •Waves are formed
                                            as the displaced
                                            water mass, which is
                                            affected gravity,
                                            tries to move back
Anthony Liekens 15:30, 28 Dec 2004 (UTC)
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           Characteristics
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          at high speeds
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       –
• Can travel enormous distances with
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  little energy loss
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• Can cause damage thousands of miles
  from its origin
• May be several hours between its
  creation and its impact on the coast
             Warning Systems
Many countries
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around the Pacific,
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including Hawaii,
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have warning » Fifth level
systems and
evacuation
procedures in the
event of a serious
tsunami.
       Effects of Tsunamis
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• Destruction of human life
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  (100,000+) level
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• Destruction of property
• Spread of disease
• Destruction of ecosystems
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http://msnbc.msn.com/id/6770108/
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http://msnbc.msn.com/id/6770108/
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                  Review
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