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Development of earth fissures in Picacho Basin, Pinal County, Arizona from 1959-1989

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Author
Slaff, S.
Jackson, G.W.
Pearthree, P.A.
Issue Date
1989-12-01
Keywords
Arizona Geological Survey Open File Reports
Picacho Basin
Pinal County
Arizona
sediment
geologic hazards
subsidence
groundwater
earth fissures
Geology

Metadata
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Citation
Slaff, S., Jackson, G.W. and Pearthree, P.A., 1989, Development of earth fissures in Picacho Basin, Pinal County, Arizona from 1959-1989. Arizona Geological Survey Open File Report, OFR-89-10, 6 map sheet, map scale 1:24,000, 38 p.
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
Earth fissures are open surficial tension cracks in unconsolidated and semi-consolidated sediments that may display vertical and/or horizontal displacement. Earth fissures have become increasingly common in the sediment-filled basins of southern Arizona where ground water is being removed at high rates. Water-table altitude decline resulting from withdrawal of large quantities of ground water causes compaction of aquifer sediments, and aquifer compaction leads to land-surface subsidence. Differential subsidence produces stresses in sediments, and fissures develop where horizontal stresses are relatively large (Strange, 1983). Earth fissures have damaged a variety of facilities in southern Arizona during the past 60 years. The formation of fissures is one of several geologic hazards that must be recognized, understood, and overcome in order to construct and maintain reliable roads, buildings, utility systems, and other structures. Under contract to the U.S. Bureau of Reclamation (USBR), the Arizona Geological Survey (AZGS) conducted an evaluation of earth-fissure development in a portion of Picacho basin (also called Eloy basin or the lower Santa Cruz River basin) in order to determine development patterns and rates. The locations of Picacho basin and the portion of the basin studied are shown in Figure 1. (38 pages)
URI
http://hdl.handle.net/10150/630808
Additional Links
https://library.azgs.arizona.edu/item/AOFR-1552429548422-624
Language
en
Series/Report no.
OFR-89-10
Rights
Arizona Geological Survey. All rights reserved.
Collection Information
Documents in the AZGS Document Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.
North Bounding Coordinate
33.1651
South Bounding Coordinate
32.3985
West Bounding Coordinate
-112.126
East Bounding Coordinate
-111.083
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