EQ-lect8_6_

EQ-lect8_6_ - Earthquakes And other Natural Hazards As the...

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1 Earthquakes And other Natural Hazards Last lecture… Tsunami Generation • Earthquakes • Volcanic Eruptions • Landslides • Volcano Flank Collapses • Asteroid Impacts As the tsunami waves enter shallow water they slow down and must squeeze their volume (& energy) into a smaller space, increasing wave height. Wave Characteristics Wave velocity and water depth
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2 wave velocity = (gravity*water depth) 4/27/2009 topic • Earthquake risks and prediction (part 1) questions • What are precursors of earthquakes? • Which populations are at risk? • Where will faults move? • How feasible is an early warning system? • When will the next Bay Area EQ happen? • What is the tsunami warning system? (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
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3 Foreshocks Lateral/vertical shifting of ground --- GPS systems Fence Offset Point Reyes Radon (radioactive gas)
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EQ-lect8_6_ - Earthquakes And other Natural Hazards As the...

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