SeisMac: How hard does an Earthquake shake?

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How hard does an Earthquake shake?
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How could we determine how accurate the student
demos of shaking were?
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UC San Diego engineering test w/ 1g accelerations
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1995 Kobe, Japan (M 6.9)
Peak ground accelerations 0.8g
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What other factor(s) might affect the amount of
damage to a house besides the ground acceleration?

• Duration of shaking
• Frequency of shaking
• Physical construction of buildings (shape,
  natural frequency, mass, quality)

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How would you expect shaking to vary in the
region around the earthquake? The damage?
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