Archive for December, 2013

The crack by the temple

26 December 2013

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.

LDSfaultmap

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.

faultLDS

I can’t pronounce this a fault trace, but it’s consistent with one.

Incident at Fontaine

11 December 2013

I want to say at the outset that I am not a licensed geologist, only a writer with a degree in the field. But when I read in today’s paper about a ruptured gas line in East Oakland that started a fire at the intersection of Golf Links Road and Fontaine Street on Tuesday, this was the first thing that came to mind: the Hayward fault. The intersection in question is just to the right of the word “Viejo.”

fontainefault

Perhaps those of you who accompanied me last year on a tour of the Hayward fault in this area thought the same thing.

The paper reported, “An investigation into what caused the fire was underway Tuesday and could take several days to complete, according to PG&E.” Let’s keep an eye out on what they report.


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