Seventy percent occurred in the high intensity area of the 1886 Charleston Earthquake. All other earthquakes during 1974-1993 ranged in magnitude from less than 1 to 3.8. From 1989-1993 there has been an increase in earthquake activity. The significance cannot be determined.
Earthquakes are unpredictable.
Thirty-nine of our 50 states are vulnerable to earthquakes. If earthquakes have occured before, they will occur again.