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EQ-lect4 - Earthquakes And other Natural Hazards Last...

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Earthquakes And other Natural Hazards
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Last lecture…
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Earthquake Locations Associated with plate boundaries Related to plate motion Plate Motion Faults Earthquakes
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Normal Fault
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Oblique Slip Fault
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Reverse Fault
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Thrust Fault
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Strike-Slip Fault
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Pacific Plate North American Plate
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Most earthquakes are the result of the sudden elastic rebound of previously stored energy Stress σ = Force/Area Strain: Deformation Brittle Failure - Earthquake
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Stick and Slip
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Stress and Strain
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Focus Epicenter & Focus
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Seismic Waves • P-waves • S-waves Love waves Raleigh waves Body waves Surface waves } }
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4/7/2009 topic Measuring Earthquakes
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questions Who was the first to study EQ damage in detail ? What is the (Modified) Mercalli Scale? What is the Richter Scale? How do you estimate M W based on fault properties? How much energy is released by an EQ?
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Lisbon Earthquake 1755
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Sebastião de Melo (prime minister)
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-how long did the earthquake last?
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