My guess is the audible, nearby ocean waves have eroded underneath the brick/cobblestone sidewalk, or, a sinkhole has opened underneath the walk, and it (the walk) is being pushed upward by the air pressure generated by waves making their way through the cavity left by said erosion.
Weird, though.
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Last edited by Gravdigr; 03-14-2016 at 03:42 PM.
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