LECTURE_09_02_18-10_TSUNAMIS_VOLCANOES_C

LECTURE_09_02_18-10_TSUNAMIS_VOLCANOES_C - Tectonic Hazards...

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Unformatted text preview: Tectonic Hazards – Tsunamis NEW STUFF (Chap. 5, 6, and 7) – Tsunamis – Examples – Volcanoes – Tectonic setting – Volcanoes – Products/hazards – Volcanoes – Types of volcanoes – Volcanoes – Examples/case studies Chapter 5: Tsunami Tsunami Generated From: • Large earthquakes that displace water by vertical seafloor movement • Submarine landslides • Submarine volcanic eruptions • Asteroid impacts How do Tsunami Form? • Rocks slowly flex as plates move – compression of margin • Subduction zone is “locked” and building up stress • Slip of >10 m creates a massive earthquake • Vertical motion/displacement of sea floor displaces water tsunami Fig. 5-9, p. 105 How fast does a Tsunami wave move? • Velocity of wave = √(g h) – g is gravity – h is water depth • For deep ocean , depth ≈ 4,600 meters velocity = 763 km/hr ( 476 miles/hr ) ~ speed of some jet aircraft • For shallower water near shore , depth = 100 meters velocity = 112 km/hr ( 70 miles/hr ) • In deep water, the wave height is 20 to 50 cm • Typically wavelength is 300 km – ~1/2 hour between two wave crests Pacific Ocean Indian Ocean Australi a India Why was the Sumatra Earthquake there? • The India Plate sinks under the Burma Plate –~6 cm/yr • Huge Earthquake • Magnitude 9 • Overlying plate bends, then finally slips in an earthquake NOAA =Burma Where Did People Feel the Earthquake?...
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This note was uploaded on 11/11/2011 for the course ISP 203 taught by Professor Paquette during the Fall '08 term at Michigan State University.

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LECTURE_09_02_18-10_TSUNAMIS_VOLCANOES_C - Tectonic Hazards...

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