They had a preview screening of this for my office. I work with a bunch of seismologists, and the overall consensus was that when it came to the science, they got *everything* wrong. The room was full of people laughing uproariously at one howler after another. The special effects were pretty good, but the acting was kind of hard to take. Too melodramatic. And not just the science was wrong. The bit that kind of summed it up was a scene where a TV news report was showing a banner that the President had declared 'marshal law'. Don't the writers have a dictionary? Anyway, if you like bad disaster movies, this is entertaining. But it's pure fantasy, and not at all an accurate portrayal.
