Chabot Road and the fault

It was a good day yesterday to visit the Hayward fault at the top of Chabot Road. The previous night’s rain softened the ground and left the cut weeds smelling like fresh hay. This is the view north from the ground above the end of the road.

chabot road fault

All of this land is suspect today, and the rocks cannot be trusted. The high ground I was standing on is the rubble pile built to support Route 24. The high ground on the right is an old excavation or rubble pile, I’m not sure which, supporting the loop linking Route 24 west and Route 13 south. The flat ground is the former roadbed of the Oakland & Antioch Railway. The trees in the distance are on a rocky slope that roughly marks the Hayward fault, but it may well have been quarried in the past. The nice thing about a fault, for producers of crushed rock aggregate, is that it pre-crushes the rocks. But the fault is somewhere in this view, although it’s poorly mapped between the Claremont Resort and Montclair.

buckling

With that preamble, I feel free to speculate that the fault trace could possibly nip Chabot Road at its farthest end. We see displacement of the curbs, and at the farther joint we see evidence of compression. In both photos the near side would be west of the fault, moving leftward.

cracking

But just as likely, this trodden, retreaded land is shifting and settling all by itself. There may be slow landsliding involved. Also, heavy trucks and other vehicles could well have done this damage. The truth may come out after the next big earthquake ruptures the fault here. It’s one place I want to check out in the aftermath, if I’m lucky enough.

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2 Responses to “Chabot Road and the fault”

  1. SteveN Says:

    I agree that could be landslide/settling damage rather than fault offset.

    Have you thought about including GPS cooordinates and or/Google Earth so we can get exact locations on these pix?

  2. Andrew Says:

    Thought about it and decided against. My posts are precise enough for anyone to find these places on Google Maps with very little work, and more fun than staring at a GPS unit.

    The same question has come up on my Oakland Sidewalk Stamps blog. I think adding GPS coordinates would be much work and little reward, and the result would be less fun to write and read.

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