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San Andreas fault trace, old and new

Detailed Description

High-resolution aeromagnetic data illuminates the geometry of the San Andreas fault offshore of the Golden Gate. Interpretation of the data by Jachens and Zoback (1998) and Zoback et al. (1999) indicated that the San Andreas fault makes a 3 km right step north of Lake Merced and a smaller 1 km left step south of Bolinas Lagoon, as shown by the red line. The orange line shows the trace of the San Andreas if it were a continuous tectonic feature, which is an older interpretation.


Public Domain.