San Andreas Fault Observatory at Depth (IMAGE)

DOE/Lawrence Berkeley National Laboratory

San Andreas Fault Observatory at Depth

Caption

Seismic waves were generated in the pilot hole of the San Andreas Fault Observatory at Depth, near Parkfield, Calif., and detected in the main hole, at depths of approximately one kilometer. An inverse correlation was found between changes in wave travel time and barometric pressure, causing increased stress in the rock.

Credit

NSF

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