Officials reported a preliminary magnitude 5.2 earthquake in Northern California Friday morning, hours after a 5.5 magnitude earthquake struck Thursday afternoon.
The first earthquake happened at 4:19 p.m. PT Thursday, according to the USGS. The USGS placed the quake's epicenter 2.5 miles southwest of East Shore.
San Francisco felt a slight shock, but no damage was reported.
"Since the quake was greater than magnitude 5, #ShakeAlert-powered alerts were delivered to cell phones," USGS ShakeAlert tweeted.
Friday morning, a 5.2 preliminary magnitude aftershock was registered near Lake Almanor, 2.5 miles southwest of East Shore, activating the alerting system again.
The USGS downgraded the Thursday earthquake from 5.7 to 5.5. The USGS reported multiple aftershocks from 2.5 to 3.8 magnitude.
The Yuba-Sutter California Highway Patrol reported the earthquake disrupted its Chico dispatch center and 911 lines. 8
The organization recommended residents to phone 530-332-1200 until they solve the problem.
East Shore is a census-designated place 162 miles northeast of Sacramento with over 150 residents.
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