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The earthquake's epicenter was three miles outside of Alum Rock, California
On October 30th, 2007 at 8:04:50 PM Pacific Time, a 5.6 magnitude earthquake struck three miles outside the city of Alum Rock, California in the San Francisco Bay Area. The shaking lasted anywhere from 30 seconds to just over a minute. The nearest major city was San Jose, California where several retail stores reported light damage and toppled food items. The quake was along the Calaveras Fault, a "sister fault" to the more popular San Andreas Fault. The quake was the largest in the San Francisco area since the 1989 Loma Prieta Earthquake; however, this quake did not cause nearly as much damage as shown through preliminary reports.
Structural damage was light, with slight cracks and damaged furniture topping the list of household damages. Eyewitnesses reported a hard jolting near the epicenter, with a light rolling farther away. Eyewitness reports flooded in to San Francisco news stations from as far east as Stockton and Modesto, as far west as Oakland, and as far north as Santa Rosa.
Television stations KPIX and KGO-TV interrupted primetime network shows to broadcast at least twenty minutes of earthquake coverage. They later resumed network shows and ran newscrawls informing viewers of the earthquake and any damage or injury reports. KGO-TV would later recover the story during its 9PM newscast on KBWB, while KPIX would not report again until its 11PM newscast. KRON opted to cover the story from 8PM to the end of its 11PM newscast, pre-empting MyNetwork TV shows until 2AM. Sacramento television stations KOVR-TV and KCRA-TV interrupted network programming during commercial breaks to update viewers on the earthquake. CNN delivered information about the earthquake during its Anderson Cooper 360 program.
Damage & Injury Reports
Damage from the Alum Rock Earthquake
Preliminary reports suggest that damage from the Alum Rock Earthquake was minimal at most. The majority of damage occured to furniture and small items inside homes, and consumer items at discount retail stores.
A man called KRON during their 10PM hour, claiming computer equipment fell on his wife during the earthquake. This was the first noted report of any injury associated directly with the earthquake. Local law enforcement officials near the epicenter reported that most 9-1-1 emergency calls were placed by senior citizens near the epicenter who had fallen while seeking shelter; however, these were not consider "injury reports" by the media.
For the most parts, cell phones proved useless following the earthquake. In the minutes following the quake, thousands of people flooded cell networks, causing them to cap and overload. Networks on AT&T, Verizon Wireless, T-Mobile, Sprint and MetroPCS were down for at least two hours and continued to be spotty throughout the early morning. Most people found e-mail and landline phone to be the most effective way of reaching loved ones and friends following the earthquake.
Slight power outages were reported immediately following the quake and was restored within the first hour. Only one report of a disconnected landline phone was reported.
Predictions
The United States Geological Survey classified the Alum Rock Earthquake with a 5.6 magnitude effect. The USGS predicts that there will be several more aftershocks within the next few days, with an effect of 1.2 to 2.1 magnitude. Anywhere from 15 to 30 small aftershocks are likely within the next week, with a ten percent chance that the following aftershocks will be larger than the main quake.
Intensity map.
According to the United States Geological Survey (USGS) a magnitude 5.6 earthquake, lasting about 30 seconds, struck at 20:04:54 (PDT) on October 30, 2007, with the epicenter being five miles north, northeast of Alum Rock California and nine miles northeast of the center of San Jose.  The actual coordinates given by USGS put it along the border of San Jose and Milpitas in the hills near neighborhoods in both cities. The quake was felt as far away as the California communities of Sacramento, Sonoma, and Los Banos. It was the most powerful quake in the San Francisco Bay Area and Silicon Valley since 1989.

At least ten aftershocks had been reported by 8:35 p.m with magnitudes ranging from 1.3 to 1.8.

Phone service, including cellular phone service, was reported to be down in some areas around the epicenter. Residents and business owners also reported their homes shaking.

According to the USGS, damage could be "moderate to heavy" and Rafael Abreu of the USGS said that the earthquake is considered "moderate," but so far there are "no injuries." The quake was reported at a depth of 9.2 km (5.7 miles).

USGS predicts a 30% chance of strong (magnitude >5) aftershocks in the next seven days, with a 5-10% probability of aftershocks stronger than the main quake. Additionally, USGS predicts approximately 15-40 small (magnitude 3-5) aftershocks.

The USGS reports that the quake was centered on the Calaveras Fault, and was the most powerful earthquake on that fault since the 1984 Morgan Hill earthquake.