[ppt]powerpoint presentation - department of...
TRANSCRIPT
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Tsunamis! Tsunamis!
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TsunamisTsunamis
• Caused by vertical displacement of water• Seismic sea waves • Not tidal waves, not caused by wind• Appear small in the open ocean• Grow in size in shallow water
– Can easily reach 15 m in height • Can travel ~1000 km/hr
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Tsunami WavesTsunami Waves
• Long periods (p) and wavelengths (wl)– Wind-waves: p = 10 min, wl = 150 m– Tsumanis: P = 1 hr, wl = 100 km– Waves have a trough and a crest
• Appear small in the open ocean• Grow in size in shallow water
– Can reach >15 m in height • Travel ~1000 km/hr• Can travel around the world quickly
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Tsunami Travel Times to Hawaii
Source: After U.S. Geological Survey.
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Tsunami Damage in Kodiak, Alaska
Source:Photograph courtesy of National Geophysical Data Center.
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TsunamisTsunamis
• Early warning systems• Pacific:
– Established in 1948, 2 years after Hawaii was hit by a tsunami
• Atlantic– Can easily reach 15 m in height
• Indian Ocean– No early warning system until 2005
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Source: http://www.prh.noaa.gov/pr/ptwc/bulletins.htm
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Indonesia, Dec. 2004Indonesia, Dec. 2004
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http://www.globalsecurity.org/military/world/thailand/images/ik_crisp_khao_lak_10.jpg
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http://www.globalsecurity.org/military/world/thailand/images/ik_crisp_khao_lak_10.jpg
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Source: http://homepage.mac.com/demark/tsunami/
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Source: http://homepage.mac.com/demark/tsunami/
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Alternative causesAlternative causes
• Oceanic volcanoes– Collapse of part of the volcano
• Landslides– Mass
• Meteorite Impacts – High energy impact from space
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Alaska, 1958
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Puerto Rico, 1918 Earthquake: 7.5
Source: http://www.usc.edu/dept/tsunamis/caribbean/webpages/index.html
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Death toll: 116
Tsunami (40) Aquadilla (32)
Source: http://www.usc.edu/dept/tsunamis/caribbean/webpages/index.html
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Source: http://www.usc.edu/dept/tsunamis/caribbean/webpages/index.html