• Smartphones employ the latest GPS technology. So scientists tested arrays of smartphones to determine if they could measure displacement caused by the earth’s shaking—and signal the subtle beginnings of an earthquake.
  • For the experiment, the researchers used a hypothetical magnitude 7 earthquake in California and data from the real magnitude 9 earthquake off the coast of Japan in 2011 that led to the tsunami that caused the nuclear accident at Fukushima. They found that as few as 500 cell phones in California could alert the public five seconds before an event, enough time to at least move to a less vulnerable part of a room.
  • The scientists say various technological details need to be worked out, such as how companies would allow smartphones to access and share the raw data. They point out that instead of waiting to buy expensive top-grade scientific equipment, governments could consider creating interim early detection systems based on arrays of sensitive smartphones.

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