NEW : Sunday 's quake is the strongest since 1976 , the state geological society says . Geologists know it as the Enola Swarm , responsible for 15,000 quakes within a year 's time , followed by more shaking in 2001 . NEW : Nearly 800 minor quakes have shaken the area since September . NEW : It caused minor damage but no injuries . Comment:
NEW : Sunday 's quake is the strongest since 1976 , the state geological society says . NEW : Nearly 800 minor quakes have shaken the area since September . NEW : It caused minor damage but no injuries . Comment: