More than 70 earthquakes and hundreds of temblors shook Southern California on Sunday and Monday, reaching a 5.5 magnitude range – the strongest the region has seen in three decades.

The last time quake swarms shook Imperial County at such a magnitude was in 1981. The region, which borderlines Mexico and is in the Brawley Seismic Zone, is known to produce 6.0 magnitude earthquakes every few decades.

At least 25 aftershocks struck the same epicenter on Sunday, and shaking could be felt up to 120 miles away. Scientists predict that jolts will be felt for several more days.

The series of earthquakes shattered windows and knocked 20 trailer homes off their foundations. A red-tile roof also collapsed and landed on a wooden fence, Maria Peinado, spokeswoman for the Imperial County Emergency Operations, told the Associated Press.

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