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A 4.6-magnitude earthquake rattled Northern California overnight Thursday, shaking residents from San Francisco to north of Sacramento.

The temblor struck at 2:09 a.m. and was centered in Geyserville, about 20 miles north of Santa Rosa, according to the U.S. Geological Survey. USGS measurements indicated at least 20 smaller earthquakes followed throughout the morning.

The Santa Rosa Press Democrat reported the quake began only one mile below ground level, which is why it was felt across the region. There were no immediate reports of damage, the newspaper said.

But it woke people up. More than 60 people reported to USGS’s ‘Did you feel it?’ site, with reports ranging from San Francisco and Oakland to Lake and Yuba counties.

Others reported the shaking on Twitter. Some of those messages are included below.

Earthquake shakes Northern California awake

Storified by @lanow’s curation of social media· Thu, Mar 14 2013 09:19:59

Nothing like having an #earthquake wake you up. A 4.6 located up in Geyserville, CA.Adam Lee
Thiiiiiink we just had an earthquake #sfrickagarcia
More quakes, this one woke us! #earthquake #northerncalifornia #californiaMichaela Cox
That #earthquake just freaked me out. Welcome back to California!theskyreport
up late working- that took me by surprise! #earthquake #napavalleyCarolyn C Burgess
Just experienced my first little earthquake tremble...Kind of a let down to be honest but the dog across the street doesnt seem to like itOmar Al-Agely
Good Morning...that was quite the shake up here in Calistoga. It got so quiet after ---more of heart racing than usual earthquake.Mayacamas Sunshine
I woke up to an earthquake a few minutes ago in Windsor. Can’t go back to sleep #earthquake #bayareaTeresa Bozzetto
There were two, back to back. First one woke us, felt v strong. Second not as strong. Still a novelty! #earthquake #northerncaliforniaMichaela Cox
The little earthquake in SF late last night was just the shock from Google Reader users pounding their desks angrily about its shutdownMatt
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— Kate Mather

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