As it turns out, one field that already makes extensive use of accelerometers is seismology. Usually these sensors are buried underground, generating much of the data seismologists use to model earthquakes. So in 2006 when Cochran saw a program called SeisMac, a light went on. SeisMac uses the accelerometers in Mac computers to let people shake their computers and watch the motion translated on screen into a graph. Cochran wondered if the same technology could be used in earthquake sensing, and

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