Bight of Bonny (IMAGE)
Caption
The source for one component of seismic noise appears to be the Bight of Bonny, a large, shallow bay off the west coast of Africa. When long-period water waves hit the continental shelf in the shallow bight, they are converted to seismic waves. Traditionally explorers defined a bight as a bay that could be sailed out of on a single tack in a square-rigged sailing vessel, regardless of the direction of the wind. This was possible only if the bay was slightly receding.
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