A 4.0 magnitude earthquake has been reported in Fremont, California, outside of San Francisco.
The earthquake, measuring an exact magnitude of 3.98, was felt in San Francisco at 2.41am local time (10.41am BST).
EARTHQUAKE!!!!!! #SanFrancisco
— Bonnie Burton (@bonniegrrl) July 21, 2015
Reports of the earthquake came as citizens were woken up from the shaking. There was little damage and no one is believed to be injured.
I seriously can't imagine anyone in San Francisco thinking it's a good idea to sleep naked. #earthquake
— daisy barringer (@daisy) July 21, 2015
California has 23.4 per cent of all earthquakes in the US and has reported 6,614 in the past year.
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Pop pop. Here come the aftershocks. Who's keeping score? I think we're on #9. #sfearthquake #earthquake #sanfrancisco #fremontearthquake
— Alexis Georgeson (@alexisgeo) July 21, 2015
The largest one in the last 12 months was a 6.0 magnitude quake in American Canyon in August when a tsunami bulletin was issued.
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