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Alquist-Priolo Earthquake Fault Zones

Ground shaking causes most earthquake damage, but surface fault rupture was California’s first statutory natural hazard disclosure. Slippage on a fault deep within the earth can break through the ground surface, shifting the landscape and everything else crossing the fault trace – fields, fences, streets, sidewalks, homes, hospitals, and water, sewer and gas pipelines. Active earthquake fault zones are a material fact in real estate.

Hosted by Geologist Patrick McClellan, B.Sc., M.A., CA PG# 3854

In this episode:

• The Alquist-Priolo fault zoning law
• Surface rupture on an “active” fault
• Zone of required investigation


Why this is important

• These faults, considered "active" by the State Geologist, are zoned and regulated to avoid surface fault-rupture hazard.
• Disclosure to a buyer is required under state law if a property is in this zone.
• The county or city General Plan Safety Element may provide maps of "potentially active" and "inactive" fault zones which local planners may also regulate.
• This disclosure is included in First American NHD and JCP-LGS disclosure reports.


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