The 2007 Alum Rock earthquake occurred on October 30, 2007 at approximately 8:04 p.m. PDT (October 31, 3:04 a.m. UTC) in Alum Rock Park in San Jose, California. It measured 5.6 on the moment magnitude scale and had a depth of 5.7 miles (9.2 km).
The Alum Rock earthquake was the largest in the San Francisco Bay Area since the 1989 Loma Prieta earthquake, which measured 6.9 on the moment magnitude scale. Ground shaking from the Alum Rock quake reached San Francisco and Oakland and other points further north.
ElarmS, an earthquake early warning system, accurately predicted the quake seconds before it struck, correctly estimating the quake's magnitude to within 0.5 magnitude units using only three to four seconds worth of data. Scientists with the California Integrated Seismic Network hope to refine the system to provide a 10-second warning in a similar quake to residents of Oakland and San Francisco.
Read more about 2007 Alum Rock Earthquake: Geology, Damage, See Also
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