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Researchers from several institutions, including the University of California, Berkeley, studied 20 years of seismic records from the Monterey County town of Parkfield.
They found that several large quakes, including the magnitude 9.0 temblor in Sumatra five years ago, triggered several small quakes in the Parkfield area.
The findings suggest the earth's largest quakes can weaken the strength of fault zones, and trigger periods of increased seismic activity around the world.
LINK: ABC7 Earthquake Preparedness Guide
LINK: Bay Area Earthquake Tracker
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