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An icon lost: The Hayward fault’s Rose/Prospect curb

Oakland Geology

Certain places are prized by geologists, especially teachers, for their educational value. Out-of-towners make pilgrimages to them. Sure we all enjoy the Grand Canyon, but real geologists have Siccar Point, Darwin’s outcrop, the Carlin unconformity and other obscure sites on their life lists.

One of those places was right nearby in Hayward, until very recently. At the corner of Rose and Prospect Streets is a corner curb that happened to be built precisely across the Hayward fault, where the steady progress of aseismic creep slowly wrenched it apart.

The best time series of this corner was compiled by Sue Ellen Hirschfeld, a now-retired geology teacher at UC East Bay. It goes back to 1971, and even then there was a sizable offset. Probably the curb was first emplaced in the late 1950s.

It’s a popular site for folks in the know, and there’s at least one Flickr group with lots…

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