This is really good physics, something I don't expect from 'official' earthquake people. The video shows ground velocity which has a direct connection with damage. You can see the directivity of the giant thrust fault, and although it progresses up the line, it is not a strike-slip fault. A video like this is another nail in the coffin for ground acceleration. But not this day. :) Engineers make good money going with acceleration, and the geologists make good money going with strike-slip faults and the hoary old 'elastic rebound theory'.