Page 2 - Ground Motion News Today : Breaking News, Live Updates & Top Stories | Vimarsana

That's important if we can understand that. and be able to better forecast what might happen in the next -- >> there's an unusual point. on the 6.4 the rupture moved down the fault more slowly an average. and maybe that contributes to the lower ground motion rather than breaking through. we don't know yet. how fast it ruptured down the fault. ta will help us address some of the pictures. and we're lucky we'll have a different rupture speed and compare how the ground motions look. >> would it appear to be opening up. would you see it move? sfwl we think you see it move. >> there's two different...

Underneath the north american plate. where two plates slide past each other is where you typically get the biggest and most earthquakes. >> earlier in the practical broadcast there was a reporter from "the washington post" indicated the soil -- again, as we're having this conversation, this is video of people literally running for their lives as the earthquake hit yesterday. but we're told the soil is also a factor in the severity of these earthquakes in mexico city. what do we know about that? >> that is absolutely correct. mexico city is built on essentially a filled-in lake bed. so, it's bu...

Dependent on that, and we really don't know how it's going to -- [inaudible] during a big earthquake. jenna: we're actually showing some amazing footage that we have from 1994. what is the scenario that you're projecting if an earthquake of this magnitude hit on the san andreas fault now? >> okay. so we're talking about the big san andreas earthquake -- [inaudible] and with strong ground motion more where -- [inaudible] north ridge was actually a near miss. the really strong ground motions were up in the mountains. so we are looking at what we call the shakeout scenario. we did the evaluation ...

>> thank you very much. >>gregg: 75 years ago an orange and reddish engineering marvel opened to traffic: the golden gate bridge in san francisco in the city by the bay. celebrating the anniversary in a big way, claudia is by the bridge with that breathtaking view. >>reporter: you know, crews say they are blown away by how well it was constructed and how knowledgeable those engineers were about the geology and the ground motion in this area back in the 1930's designing this with a number two pencil and a slide rule and doing it in the middle after great depression, one of the earliest public w...

also, infighting within the tea party movement, and a congressman's explosive charges that elements of the movement would like to see him hanging from a tree. and we'll take you inside the archives of moammar gadhafi's brutal regime and uncover secrets that massacre victims took to their graves. we want to welcome our viewers in the united states and around the world. i'm wolf blitzer. you're in "the situation room." there is little to celebrate this labor day weekend here in the united states for millions of americans who want to be working, but simply can't find a job. and ther...