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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 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) : standing on one side of a fault, the other side moved right relative to the side you are standing on
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