7_Earthquakes_JLG

7_Earthquakes_JLG - Lab Exercise 7 Earthquake Hazards and...

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Lab Exercise 7 Earthquake Hazards and Human Risks
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Earthquakes Shaking motions and vibrations caused by releases of energy The focus is the point of origin for seismic waves beneath Earth’s surface The epicenter is the point on Earth’s surface above the focus Seismic waves go out in all directions from the focus like ripples on a pond
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Detecting Earthquakes Seismographs detect seismic waves and record them on a seismogram P-waves: p rimary waves arrive 1 st ; compression or “push-pull” waves S-waves: s econdary or s hear waves arrive 2 nd ; dilation or “side-to-side” waves L-waves: L ove waves (after A.E.H. Love) travel along Earth’s surface
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Surface Waves Body Waves P-wave S-wave Pwave.htm.url Swave.htm.url
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Active faults can move and generate earthquakes at the present time Left-lateral fault (sinistral) : standing on one side of a fault, the other side moved left relative to the side you are standing on Right-lateral fault (dextral)
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This note was uploaded on 03/06/2011 for the course GEO 301 taught by Professor Long during the Fall '07 term at University of Texas.

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7_Earthquakes_JLG - Lab Exercise 7 Earthquake Hazards and...

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