geology_13-1 - Chapter 5: Earthquake Material...

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Chapter 5: Earthquake Material amplification: Seismic waves travel differently through different rock materials Propagate faster through dense and solid rocks Material amplification: Intensity (amplitude of vertical movement) of ground shaking more severe in unconsolidated materials Seismic energy attenuated more and propagated less distance in unconsolidated materials Earthquake magnitude scale: Richter scale: The amplitude of ground motion Increasing one order in magnitude, a tenfold increase in amplitude Moment magnitude scale Measuring the amount of strain energy released Based on the amount of fault displacement Applicable over a wider range of ground motions than Richter scale Earthquake energy : Increase one order in magnitude, about a 32-times increase in energy Earthquake intensity scale: Modified Mercalli Scale 12 divisions Qualitative severity measurement of damages and ground movement Based on ground observations, instead of instrument measurement
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geology_13-1 - Chapter 5: Earthquake Material...

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