Seismology occasionally interests the public, an occupational hazard that recently struck seismologists in the Pacific Northwest.

The source time function was a professional football player: Marshawn Lynch, whose spectacular 15-second touch-down run assured the local Seahawk team an unlikely and coveted victory on 8 January 2011, and a victory in the playoffs. Through the response of the roar and stomping of the tens of thousands of feet, the ground shook enough that the vibrations were recorded by the Pacific Northwest Seismic Network (PNSN) strong-motion station KDK, a block or so away. One-station signals are always hard to verify, but the...

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