Ocean101-Ch09-Part1 - Chapter 9 WAVES Ocean waves are...

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1 Chapter 9 Chapter 9 - WAVES Ocean waves are visual proof of the transmission of energy across the ocean Waves Are Moving Energy Fig. 9.4, p. 202 Classifying Waves Classifying Waves Waves are classified according to the type of force that disturbs the water to make the wave Also human activities (wakes of ships, explosions) Table 9.1, p. 202 Also Also… Internal Waves Internal Waves = Waves that occur at the boundaries of water layers of different densities (e.g., at the pycnocline) See Fig. 9-19a, p. 213
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2 Lituya Bay, Alaska (1958) Mag 8.0 quake ! Landslide ! Local tsunami (splash) Water 1,720 ft high! and 3,600 ft inland Boats anchored in bay 2 killed, all others ok
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3 What Is a What Is a Tsunami? http://pubs.usgs. gov/pp/pp1707/ What was this tsunami and why was it called the “orphan” tsunami? What Is a Tsunami? What Is a Tsunami? Caused by sudden changes in volume of ocean basin Mainly submarine earthquakes Volcanic eruptions Submarine landslides Tsunami
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4 Tsunami Very long wavelength Travels fast Raises sea level as crest shoals Trough causes sea level to fall Disastrous for infrastructure at coasts Possibly much loss of life Can be series of waves, not just one! Tsunami Warning System Monitor seismic activity Monitor changes in unusual wave activity Warning ! Evacuate WITH OR WITHOUT a siren or other warning, go to high ground inland if you ! re near water and feel a quake! See Fig. 9-29b, p. 222 Tsunami Required Readings http: http: //scidiv //scidiv .bcc. .bcc. ctc ctc. edu/gj/TsunamiResources edu/gj/TsunamiResources .html .html (…and linked to our Course Calendar page) 1. One-page diagram, tsunami vs . regular (wind) waves: http://www.ess.washington.edu/tsunami/images/tsunami.pdf 2. Tsunami Tsunami” chapter from Hyndman textbook: http://www2.ups.edu/faculty/gjones/TSUNAMI- 06GE305HyndmanCh52.pdf 3. "Surviving a Tsunami--Lessons from Chile, Hawaii, and Japan and Japan” from USGS: http://pubs.usgs.gov/circ/c1187 Fig. 9.28, p. 221
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5 3 Types of Waves Push-Pull Side-to-Side Round-&-Round Wind Waves Wind waves are orbital waves : waves in which the particles of water move in closed circles as the wave passes.
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