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  1. The San Andreas Fault Observatory at Depth (SAFOD) is a research project that began in 2002 aimed at collecting geological data about the San Andreas Fault for the purpose of predicting and analyzing future earthquakes. The site consists of a 2.2 km (1.4 mi) pilot hole and a 3.2 km (2.0 mi) main hole. Drilling operations ceased in 2007.

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