LECTURE_09_02_18-10_TSUNAMIS_VOLCANOES_C

# LECTURE_09_02_18-10_TSUNAMIS_VOLCANOES_C - Tectonic Hazards...

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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

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Chapter 5: Tsunami
Tsunami Generated From: Large earthquakes that displace water by vertical seafloor movement Submarine landslides Submarine volcanic eruptions Asteroid impacts

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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

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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

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Where Did People Feel the Earthquake?
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