earthquakes2

earthquakes2 - Where are earthquakes? Not RandomCollections...

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Not Random Collections of them What ARE Earthquakes? A. Elastic Failure of Rocks B. Rapid Slip on a Fault What is Plotted on a Map? Epicenter - surface expression directly above the actual earthquake. Focus- physical position inside the earth. Why are Earthquakes interesting? -Destruction -Give information about Earth’s interior (and faults). -Seismology -Formation and exposure of mineral resources -Contribution to GW and Energy resources What happens in an earthquake? -Building swaying/pancaking -Fire and explosion from fuel tanks and lines -Liquefaction of sand and clay -Landslides -Tsunamis How big are earthquakes? Magnitude vs. Intensity Moment/Richter Scale-logarithmic scale of Energy release Modified Mercalli Scale-shaking intensity Magnitude # Per year Damage 8 1 in 10 yrs. Total 7.4 1 in 5 yrs. Massive 7.3 1 per year Lots 7.0 10 per year Some Original Mercalli Scale -Failed How do we measure seismic waves? P-compressional waves (fastest)
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This note was uploaded on 04/07/2008 for the course ENV 114 taught by Professor Cole during the Spring '08 term at Northeastern.

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earthquakes2 - Where are earthquakes? Not RandomCollections...

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