Subsidence zone near an abandoned pit mine in Pinal County. Subsidence is sinking, caving, or fissuring of the land, often as a result of reduced groundwater levels.¹ ²
Two different articles, same title. First is more contemporary, second is more readable:
¹Arizona Land Subsidence Group. Land Subsidence and Earth Fissures in Arizona. http://www.azgs.az.gov/Resources/CR-07-C_Dec07.pdf. 2007.
²Slaff, Steven. Land Subidence and Earth Fissures in Arizona. http://www.azgs.az.gov/HomeOwners-OCR/earthfissuresinarizona.pdf. 1993.
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