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Moment magnitude is preferred to the Richter scale for large earthquakes because it

  • A.depends on the observer's location
  • B.measures the total energy released
  • C.can be computed without any instruments
  • D.gives a smaller number for the same event

Answer: B

Moment magnitude is derived from the seismic moment, which combines rock rigidity, rupture area and average slip, so it keeps increasing as ruptures get bigger. The Richter scale saturates because the single wave amplitude it uses stops growing.

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