The arrival of man-made earthquakes.
In the fall of 2011, students in Katie Keranen’s seismology course at the University of Oklahoma buried portable seismograph stations around the campus, in anticipation of a football game between the Sooners and the Texas A. & M. Aggies. The plan was to see if the students could, by reading the instruments, detect the rumble of eighty-two thousand fans cheering for a touchdown. “To see if they can figure out if a signal is a passing train or a cheering crowd—that’s much more interesting for them than discussing data in theory,” Keranen, an assistant professor of geophysics, told me.
But at 2:12 A.M. on November 5th, the day of the game, people in seventeen states felt an earthquake of 4.8 magnitude, centered near Prague, Oklahoma, a town of roughly twenty-five hundred, which is about an h
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