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A series of earthquakes has Southern California shook. Is a big one coming?

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A 4.4 -magnitude quake near Pasadena in mid-August jostled the region to attention.

Scientists say the region has been relatively quiet for a long time.

The worst in modern Los Angeles history was the Northridge earthquake in 1994 , the first to strike under a major metro area since the 1930s .

It detects ground motion as soon as shaking starts on the earth ’s surface.

Estimated size and location are quickly calculated and become the basis for emergency alerts.

The alert will tell you who is likely to feel the strongest shaking, giving people a precious few seconds of warning.

October 17th is the Great ShakeOut a day for people around the world to practice earthquake safety drills.