Magnitude-5.7 quake strikes off NorCal coast

A magnitude 3.8 earthquake struck at 10:10 near Burney California on Sept. 20 2017

A magnitude 3.8 earthquake struck at 10:10 near Burney California on Sept. 20 2017

A preliminary-magnitude 5.7 quake struck off the coast of Northern California on Friday afternoon, but there was no threat of a tsunami, officials said.

About three hours before that tremor, a 3.3-magnitude quake was reported closer inland, the USGS recorded.

Both quakes were very shallow, which amplified their effects, Reuters reported.

No tsunami warnings were issued by the U.S. Tsunami Warning System as a result of the natural disaster.

The organization's website noted that 20 minutes earlier, a 5.7 magnitude natural disaster hit in the same general area, but 150 km further from the coast.

There have been no reports of injuries or damage.

The area was shaken by a magnitude 6.5 quake in December 2016.

They are considered moderate and capable of causing considerable damage if they hit a heavily populated area directly.

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