1EarthquakesEarthquakes• What are they?• How do we measure them?• Where do they occur?• How do they effect us?• Can we predict them? How?What is an earthquake?•Shaking of the ground initiated by a sudden releaseof energy•The energy radiates as seismic waves that travel within earth and onto the surface•Large seismic event result in observable ground motion•Small events can be detected by instruments•This energy release can be caused by a variety of factors:
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2Causes of earthquakes• The maincause of earthquakes is rock yielding to stresses in the earth’s crust– source of stress?why is energy release instantaneous?– why is energy release instantaneous?•Fault-related earthquakes– earthquake event makes the fault– or earthquake occurs along an existing fault Fault-related earthquake