Seismometer
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A company is developing a early warning system for earthquakes for smartphones, according to the San Francisco Chronicle.

The Zizmos system works off a sensor that users install on the outside wall their home. The sensor detects any shaking and sends the information to a cloud-based server which uses an algorithm to determine whether the shaking was the result of an earthquake or something else, such as a nearby accident. Then the system pings the user's smartphone with a warning. The whole process takes a couple of seconds, according to the company.