A 5.6-magnitude earthquake struck near Mendocino County early last week.
The quake echoed through Northern California across the area.
Cell phones across the Bay Area buzzed with ShakeAlert warnings.
The shaking reached San Francisco and nearby communities.
Reports say minimal damage showed up right after.
Officials remain on alert for aftershocks.
They urge people to stay ready to be safe.
5.6 earthquake reported in Northern California, triggers alert across Bay Area San Francisco Chronicle
Shake alert lights up Bay Area phones Wednesday morning after 5.6 quake hits Mendocino KRON4
Magnitude 5.6 earthquake felt across Northern California, USGS says KCRA
Northern California hit by magnitude 5.6 earthquake in Mendocino County CBS News
Magnitude-5.6 earthquake shakes parts of Northern California NBC Los Angeles