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EQ-lect9_6_ - Earthquakes And other Natural Hazards...

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1 Earthquakes And other Natural Hazards Earthquake on Monday Magnitude 5.6
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2 (possible) Earthquake precursors Drop in ground water level Increase in pore fluid pressure Change in ground elevation Lateral shifting of ground • Foreshocks Increase in amount of radon gas To be useful, an earthquake predicition must include: A date/time window A well-defined geographic area Probability estimate Derived from a proven, tested method Seismic Wave Speed (P-waves) In air: 330m/s In water: 1450m/s 5000-7000m/s in typical crust >8000m/s in mantle and core in granite: 5000m/s =18,000kph =11,200mph Seismic Wave Speed (S-waves) 3000-4000m/s in typical crust >4500m/s in mantle Seismic Wave Speed (Love waves) • 2000-4400m/s Seismic Wave Speed (Rayleigh waves) • 2000-4200m/s 4/28/2009 topic • Earthquake risks and prediction (part 2) outline How does the Japan EQ early warning system work? How prepared is the Bay area?
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