The Oakland Urban Paths walk last month took us along a stretch of the Hayward fault that included the Oakland LDS temple. Here’s that segment of the fault on the map.
The temple is just below the dashed line across the map (which marks the 26th kilometer from Point Pinole). The codes refer to geomorphic (G) evidence of the fault, G1 being “strongly pronounced”: a linear valley (lv) and a notch (n). Less obvious are linear scarps (G2, sl) and a scissor point (G3, sc). The circle labeled C2 marks a measured feature that documents creep, a surveyed offset (so) documented in report number L91, which was a 1991 article in the Journal of Geophysical Research.
Knowing all that, I had my eyes peeled as we went through the temple grounds. This is right by the front gate between the grounds and Maiden Lane.
I can’t pronounce this a fault trace, but it’s consistent with one.