EQ-lect4

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 - w a v e s •S - w a v e s • 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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This note was uploaded on 05/31/2009 for the course GEL 17 taught by Professor Osleger,d during the Spring '08 term at UC Davis.

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

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