John G. Helms

We conducted paleoseismic studies in a closed depression along the San Andreas fault on the north flank of Frazier Mountain near Frazier Park, California. We recognized two earthquake ruptures in our trench exposure and interpreted the most recent rupture, event 1, to represent the historical 1857 earthquake.

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Susan Blake
susan.blake@usda.gov

Apache Leap Special Management Area
Apache Leap SMA website