Aftershocks occur because_______ .
A) seismic energy continues to build up for a period of time after a major earthquake
B) there are always small earthquakes on major faults, but we do not notice them until there is a large event that makes us aware of them
C) the day after a large earthquake there are tidal forces that continue to create additional earthquakes
D) the area surrounding a region that experienced a large earthquake needs time to adjust to the displacements on the main fault
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