Magnitude 5.5 earthquake shakes Northern California; magnitude 5.2 aftershock hits Friday morning

A preliminary magnitude 5.2 earthquake registered in Northern California Friday morning, hours after a 5.5 magnitude earthquake shook the same area Thursday afternoon, officials said.

According to the U.S. Geological Survey, the first earthquake occurred at 4:19 p.m. PT Thursday. The quake's center was about 2.5 miles southwest of the community of East Shore, according to the USGS. A brief jolt was felt in the San Francisco Bay Area but there are no immediate reports of damage.

"Since the quake was greater than magnitude 5, #ShakeAlert-powered alerts were delivered to cell phones," USGS ShakeAlert said on Twitter.

The notification system was activated again Friday morning, when an apparent aftershock of 5.2 preliminary magnitude was recorded at Lake Almanor, about 2.5 miles southwest of East Shore.

Preliminary readings said the Thursday earthquake had a magnitude of 5.7, but the USGS updated its reading to 5.5. The earthquake was followed by several aftershocks that ranged from 2.5 to 3.8 in magnitude, according to the USGS.

The California Highway Patrol in Yuba-Sutter said the earthquake caused a disruption at the agency’s Chico dispatch center and 911 lines were down. The agency advised people in the region to call 530-332-1200 as they work to fix the issue.

East Shore is a census-designated place with a population of over 150 and is about 162 miles northeast of Sacramento.

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Northern California residents jolted by earthquake

Thursday's earthquake jolted portions of Northern California with some residents sharing their reactions on social media.

People reported feeling the earthquake across several counties, including Sacramento, Placer, El Dorado, San Joaquin, Solano, Colusa, Nevada, Yolo and Butte counties.

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