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Devastating could that be? >> with earthquaking it's all about locations, building codes and preparation, so if a similar earthquake had happened underneath san francisco and la we would be looking repeat of 1989, 1994 north ridge in la, similarity sized earthquakes, for real contrast you can look at when we had i think the 2010 earthquake in haiti, that was magnitude 7.0, technically smaller than this and yet tens of thousands of people died because the earthquake was right underneath major cities and they didn't have the building codes and infrastructure so a lot of building collapses happen...

Magnitude, the epicenter of this earthquake. there was a 5 foreshock. we thought the 6.4 was the earthquake. and there had been swarms of earthquakes that were taking place before them. but now we know the 6.4 was a foreshock. so what is very curious is that the usgs says there is about a 10% chance that over the next week, we could see another 7.0 plus magnitude earthquake. that yesterday they were saying well, we could see about a 5% chance, that we could see a 7.0 plus earthquake, and we did. those aren't very high probabilities, but now there is an even higher probability that we will. and...

Come within the next few days. cnn meteorologist ivan cabrera joining me now from the weather center. ivan, this 7.1 earthquake, you know, was felt for hundreds of miles. folks in nevada, people in mexico. >> yeah, good to see you, no question to hear. my goodness, what you just said hopefully won't come to pass. the there's a 4% chance it will, that is getting something stronger than a 7.1 this week. after that i think we're in good shape as far as the intensity here. as far as your question, over 36 million people basically have felt some kind of shaking. not everybody felt the severe that i...

And then all the little dots you see here, those are additional earthquakes. those are aftershocks because the earth is not done moving. you get that one violent move, and then in rapid succession at times, we've had upwards of i think at this point an aftershock every other minute or every minute, so quite something. you're not going to feel all those, but some will be significant. as far as the difference, it is five times bigger as far as the amplitude which isn't that important, this is, 11 times stronger, right? that energy that comes from that displacement below the earth, that is what c...

Probabilities of earthquake, 5% is the generic number. that's on average over the whole area. the ability to have -- what you're going to be triggering, if we're seeing a lot of aftershocks, the numbers go up a bit just because when you have a lot of earthquakes, you tend to have a lot of earthquakes. this is an active sequence. therefore, the chance of an aftershock that's bigger than the main shock goes up with the overall number. so this is probably, you know, this was a 7.1. a 7.0 would technically still be an aftershock. and when we give you that 1 in 10 number, it doesn't include that po...