It measured 5.6 on the moment magnitude scale and had a maximum Mercalli intensity of VI (Strong).

Ground shaking from the Alum Rock quake reached San Francisco and Oakland and other points further north.

Sixty thousand felt reports existed far beyond Santa Rosa, as far north as Eugene, Oregon.

[5] Intensity VI (Strong) effects included broken windows and items that were knocked off store shelves, but the event caused no serious damage or injuries.

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.