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http://www.usgs.gov/faqs/what-probability-earthquake-will-occur-los-angeles-area-san-francisco-bay-area
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3. California Building Standards Commission (2013) California existing building code, vol 1 and 2. California Building Standards Commission, Sacramento, 752p
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http://www.asce.org/magazine/20150818-new-bridge-unfolds-in-japan/