A tiny earthquake hits Southern California once every 174 seconds on average. That’s the implication of a new study that found 1.8 million previously undetected tremors. The minuscule quakes - as small as 0.3 magnitude - can’t be felt on the surface, but they could help predict larger earthquakes.

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A tiny earthquake hits Southern California once every 174 seconds on average. That’s the implication of a new study that found 1.8 million previously undetected tremors. The minuscule quakes - as small as 0.3 magnitude - can’t be felt on the surface, but they could help predict larger earthquakes.