4.6-magnitude earthquake shakes Northern California awake
March 14, 2013 | 9:54
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.