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A new phone app senses vibrations and alerts people to earthquakes.
The phone app recognizes sudden shaking of the earth's surface through sensors in smartphones.
The new app is called MyShake.
It is the work of four researchers at the University of California, Berkeley.
They said they created a worldwide warning system that would inform people and give them time to prepare for earthquakes.
Other earthquake apps include QuakeFeed, Quakes and Earthquake.
They show where earthquakes have happened, their strength, and any aftershocks.
The apps use information from the U.S. Geological Survey.
The MyShake app is available only for Android phones.
Smart phones are equipped with accelerometers..
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