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Back up. there has been one aftershock. what do we know about the likelihood there will be another significant aftershock? >> reporter: okay. so there's already been one magniyou today 5.7 and several smaller ones as well. on average, the largest aftershock to a magnitude 7 will be magnitude 5.8, 5.9. that's only on average. a magnitude of 5.6 is probably on the order of 20-to-30%. the chance you can have after aftershock bigger than the first one, we clang the name and call the first 21 a foreshock. >> that is actually up at 5%. the fact that it's been several hours since the earthquake alrea...

What's surprising here is really that the level in los angeles has been extremely low for the last two decades, so though this would be normally not something to get people excited about, the fact that the region has been so quiet for so long means this might represent a pickup of seismic activity in the area. >> you mention that 5% chance of this foreshadowing a larger quake. back in 2008, as you know, usgs released this study saying that california has a more than 99% chance of having a magnitude 6.7 quake or larger in the next 30 years. how concerned should people in that area be? >> well, ...

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