Wallace, a seismologist at the University of Arizona, has studied records of ground vibrations triggered by the crash to reconstruct how the event unfolded.
Based on the amount of seismic energy, Wallace could estimate how the plane came down: "The UA flight produced a significant signal, consistent with a fully-loaded jet that was intact, or nearly intact, on impact." That finding disputes rumors that the hijacked jet was shot down, he says, because a missile or other explosion would have broken the craft into smaller pieces that would have caused less seismic disturbance. The Pan Am crash over Lockerbie, Scotland, which blew apart in midair, produced only a faint signal, even though the crash occurred close to an array of ground-motion sensors.
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