In January there was a 6.9 quake here in Chile, and seismologists said it was an aftershock of the big earthquake of one year earlier. For what I recall, any e

In January there was a 6.9 quake here in Chile, and seismologists said it was an aftershock of the big earthquake of one year earlier. For what I recall, any earthquakes within a couple of years of the big one are most probably aftershocks.