Quake 'knocked everything off the walls'

>> at least ten aftershocks which have rumbled out in the wake of what may be the biggest earthquake in oklahoma 's history. fortunate fortunately, no one was seriously hurt. it woke people up this morning.

>> all of a sudden it just shook. it was unbearable. the stuff that was falling.

>> it knocked everything off the walls.

>> the original saturday night quake which measured at 5.6 magnitude is centered in sparks. about 44 miles outside of oklahoma city . oklahoma geological survey research seismologist austin holland joins me by phone. first of all, everything okay by you? did you feel it?

>> caller: i did feel it. it woke me up avid gotten the 20 minutes of sleep i had gotten in the last 24 hours .

>> that's because you had a quake the previous evening.

>> caller: that's right. we went out in the area and deployed sies momteres. we were fortunate in the sense that we were able to record more information for this larger earthquake.

>> the second one was larger by, what, about seven tenths of a point.

>> yeah.

>> does that give cause for concern that you've got one earthquake and then another one that is greater in magnitude so close together?

>> caller: it happens quite frequently. it's surprising for us in oklahoma . it was very startling for all the residents that felt it.

>> what's the situation with the fault lines there? i mean, this isn't typical for oklahoma . this is the largest quake to happen there in 59 years.

>> caller: yes. this is the largest earthquake in quite some time. we have a number of faults that we recognize that can have earthquakes here in oklahoma . you know, we fully expect to have earthquakes here in oklahoma .

>> okay. how about aftershocks, what are you bracing yourselves for?

>> we expect them to continue for days to weeks. maybe even months. we've had 11 aftershocks above magnitude 3. which means they're being felt by local residents.

>> i'm curious, though, austin , if you have this second quake, which was larger than the first, are there concerns that even larger quakes or aftershocks may come?

>> caller: that's certainly possible. that's why we're trying to learn as much about this fault as quickly as we can.

>> austin holland, i'd love to say get some rest but i have a feeling you'll keep busy today. thanks for yu time.

>> thank you.