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Seismic moment depends on the rigidity of the rock, the average slip and the

  • A.depth of the water table
  • B.distance to the nearest recording station
  • C.duration of the aftershock sequence
  • D.area of the fault that ruptured

Answer: D

The product of these three quantities describes the physical size of the source, which is why moment magnitude tracks great earthquakes faithfully. A long rupture with large slip gives a very large moment however the waves happen to be recorded.

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