National Geographic:
What's an 'Earthquake Swarm,' And Is One Hitting Taiwan?


The U.S. Geological Survey reports that the earthquake that happened on February 6 was the largest sequence of events in the region over the past several days. A M-4.8 quake hit on February 3, and as of Tuesday, 19 earthquakes in the area were measured at M-4.5 or larger.

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