Fault Studies
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 The Alquist-Priolo Act of 1972 requires geologic study of earthquake faults in areas where one is suspected of having ruptured at the surface. Our geologists are trained experts at identifying faults, and more importantly, identifying when the last time it ruptured. This involves digging trenches, usually at least 3 feet wide, 6 feet deep, and up to hundreds of feet long, which are often shored by steel braces to keep the walls from caving. Geologists look for anomalies in the soil layers, offsets, gaps filled by debris, and then gauge the age of the most recent slippage by using geologic techniques such as radiometric or isotope age-dating.
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aessoil.com - Phase One Environmental, Engineering, AES Los Angeles
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