The story

Experts are mystified by a "swarm" of earthquakes hitting Reno, Nevada.

Quakes aren't uncommon there, but analysts just do not know what has caused 344 of them in the area in the past week, the strongest of which was magnitude 4.7.

The quakes have prompted schools to teach more emergency drills while seismologists examine the data for clues. Read full article »

All About EarthquakesU.S. Geological Survey

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