Sidewalk Separation
The Hayward Fault in Oakland, California
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The Hayward fault is locked between 5 and 13 kilometers depth, but in many places along the fault the upper parts move continually at 3 to 4 millimeters per year in the process called fault creep. This sidewalk and curb are oriented along the fault, so creep tends to stretch them. Because concrete is not laid down with gaps in it, creep can be very apparent on city streets.
Photo (c) 2005 Fleur Helsingor, reproduced by permission. (fair use policy)
