The patterns were noticed by aerial photographer Julie Belanger, who told ABC News she was shocked to discover them during a flyover on Monday.
Adding to the mystery is a video (below) that shows two friends coming across the patterns after seeing green lights emanate from a field.
A representative from local Echelon Security Co. told the San Jose Mercury News he was hired to protect the land from rowdiness, but could not provide the identity of the landowner. A spokesperson for Echelon declined to provide further comment to ABC News.
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Aerial images show bizarre markings in a field in Salinas, Calif., Dec. 31, 2013
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