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Napa residents weren’t warned of the recent 6.0-magnitude earthquake because the state doesn’t have an early warning system like ones found in Japan and Chile. The WSJ’s Deborah Kan speaks to David Oppenheimer of the U.S. Geological Survey about the latest quake to strike the San Francisco Bay Area.

“California Earthquake: No Early Warning System” is categorized as “world”. This video was licensed from Grab Networks. For additional video content, click the “video” tab at the top of this page.