18. Fightingback - Ante-pre-show: disturbing videos of 2004...

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Ante-pre-show: disturbing videos of 2004 tsunami
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Beach nourishment 18. Fighting back Tsunamis Hard stabilization Retreat!
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Tsunamis Banda Aceh Shore, Indonesia: before and after 2004 Dec. 26th “Boxing Day” tsunami The Great Wave off Kanagawa[1] Artist Katsushika Hokusai Year c. 1829–32 Typecolor woodcut
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Tsunamis Sea wave resulting from large-scale seafloor displacement. Wave moves from source in all directions. About every 15 years a destructive ocean-wide tsunami occurs.
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Earthquake displacing seafloor Submarine landslide Undersea eruption Meteor impact Tsunamis causes
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Tsunamis In deep water, wave speed >500 mph, wavelengths ~100 miles, wave heights maximum 3 feet. - Difficult to observe! In shallow water waves slow and shoal increasing wave height. Run ashore as huge breaking waves ~ 30 m maximum. Appears as rapidly advancing tide. Time between crests of incoming waves about 20 minutes. Generation Propagation Shoaling Inundation
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Historic large tsunamis 1600 BC Santorini Explosion 1491 Mahuika Crater impact, New Zealand 1700 Cascadia (est Mw > 9.0) 1755 Lisbon, Portugal ( Mw = 8.5, 90,000 dead) 1883 Krakatau (est 36,000 dead) 1896 Sanriku, Japan (Ms = 7.0, ~ 22,000 dead) 1960 Chile (Mw = 9.5, 500-2300 dead) 1964 Alaska (Mw = 9.2, 122 dead) 2004 Indonesia (Mw = 9.0, > 250,000
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Hilo, Hawaii 96 people dead $26 million damage Puumaile Tuberculosis Hospital Hilo Harbor Kamehameha Ave., Hilo 1946 Aleutian Tsunami
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OFF THE WEST COAST OF NORTHERN SUMATRA Sunday, December 26, 2004 at 00:58:53 UTC Focus 6.2 miles below seafloo r Indonesian Tsunami December 26, 2004
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Subduction Zone earthquake
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Figure 6.B S u m a t r
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Tsunami strikes Ao Nang, Thailand.
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Japan was struck by a magnitude 9.0 earthquake off its northeastern coast Friday. This is one of the largest earthquakes that Japan has ever experienced. . USGS Part of houses swallowed by tsunami burn in Sendai, Miyagi Prefecture (state) after Japan was struck by a strong earthquake off its northeastern coast Friday, March 11, 2011. New York Times In downtown Tokyo, large buildings shook violently and there was severe flooding due to a tsunami generated by the earthquake. Magnitude 9.0 East of Honshu, Japan Friday, March 11, 2011 at 05:46:23 UTC
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This earthquake occurred 130 km (80 miles) east of Sendai, Honshu, Japan and 373 km (231 miles) northeast of Tokyo, Japan. Images courtesy of the US Geological Survey Magnitude 9.0 East of Honshu, Japan Friday, March 11, 2011 at 05:46:23 UTC
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Globally, this is the 4th largest earthquake since 1900. 1900 2100 2300 2500 2700 2900 3100 3300 3500 3700 3900 0 2 4 6 8 10 12 Great (M > 8) Earthquakes Since 1900 Year Magnitude Chile 1960 Alaska 1964 Sumatra 2004 Chile 2010 Japan 2011 Russia 1952 Ecuador 1906 Alaska 1965 Magnitude 9.0 East of Honshu, Japan
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This earthquake was the result of thrust faulting along or near the convergent plate boundary where the Pacific Plate subducts beneath Japan. This map also shows the
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18. Fightingback - Ante-pre-show: disturbing videos of 2004...

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