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It takes many decades to make your buildings more resilient. >> neil: it's the luck where you are, too. it's a densely populated city and area. when you look at the fall-out for something like this, there's always after-shocks, what do you envision here? what do mexicans have to look out for in the area or region? >> there will be strong after shocks. another strong chance of another strong earthquake. it's not a high probability. approximately 10 million people felt strong ground motion in this earthquake. we're anticipating casualties and we're also seeing early indications of that. again, i...

Have two big tectonic plates that are sort of rubbing against each other. on the east coast there is a path of margin and no big boundary between tectonic plates so it is unexpected. >> neil: so the ground is firmer a quake can carry further. this apparently went all the way from maine down to southern virginia then through the carolinas. is that unusual? >> that is absolutely right. in the eastern u.s. the ground is elder and colder and seismic energy can travel more efficiently. so what that means compared to the western u.s., if you had a 5.8 in california it wouldn't cause nearly the amoun...

5.8 in eastern is equivalent to something in the sixes in terms of ground motion. >> neil: what should we look out for the east coast now? normally aftershocks are lesser strength than the original hit. what do we see now? >> normally we expect the biggest aftershock in a sequence is going to be about one magnitude less than main shock. so we would expect the biggest to magnitude 5 or maybe in the high 4's. it doesn't always hold true and there is a small probability this is aforeshock that anticipating a larger shock. most likely 3's and 4's which will be felt in the area especially in virgin...