aftershocks. we've had about 120 aftershocks of magnitude five and greater in this area. the thregathrust means this was a huge earthquake, this was about 300 miles long on the fault that ruptured and went to the fault -- this plate went beneath south america, so the plate went beneath south america, causing this megathrust. >> thank you, paul earl with the earthquake center and bill, we'll be monitoring all the activities with the aftershocks. bill: hawaii and other areas in the pacific dodged a bullet. that's a good thing and we know that. the experts told everyone to head for higher ground, fearing the worst. it was an 8-foot wave. five years after the devastation in south asia that killed 200,000 people, is our warning system any better? john rundle is a seismologist, good morning to you, can you explain what happened here? >> good morning. basically, the last time i was on one of these programs