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Arizona Geological SurveyDM-EF-11 (Tator Hills), v. 3.0

MAP EXPLANATIONRed lines represent the location of continuous earth fissures manifested as open cracks orgullies.Orange lines represent the location of discontinuous earth fissures manifested as elongatedto circular depressions or as abbreviated or irregular linear depressions. Thesediscontinuous surface features frequently represent an incipient surface expression of anearth fissure.Yellow lines represent the location of fissures confirmed by non-AZGS personnel or clearevidence of earth fissures on aerial imagery. Traditional field investigation of these featuresby AZGS was hindered by agricultural or urban modification of the land surface.Green lines represent the approximate locations of unconfirmed earth fissures, defined asfissures which could not be confirmed by surface investigations by AZGS geologists, butwhich have been previously reported by Professional Geologists in published documents ormaps.The outline of the Study Area is shown in blue. The limits of the study area are based oninterpretation of modern and recent ground subsidence data provided by the ArizonaDepartment of Water Resources. Historical and modern aerial photos taken within thisarea were searched for anomalous lineaments. These lineaments were then investigated inthe field to determine if there was any evidence of earth fissures.

±1:24,000 Scale

1 0 10.5 Miles

1 0 10.5 Kilometers

0 1000 2000 3000 4000 5000 Feet

Arizona Geological Survey1955 East Sixth Street, PO Box 210184

Tucson, AZ 85721(520) 621-2470

www.azgs.arizona.edu

Ground subsidence05/15/2010 To 03/15/2017Total Land Subsidence

Decorrelation/No DataGreater 40 cm (15.7 in)25 - 40 cm (9.8 - 15.7 in)15 - 25 cm (5.9 - 9.8 in)10 - 15 cm (3.9 - 5.9 in)6 - 10 cm (2.4 - 3.9 in)4 - 6 cm (1.6 - 2.4 in)2 - 4 cm (0.8 - 1.6 in)1 - 2 cm (0.4 - 0.8 in)0 - 1 cm (0 - 0.4 in)

© MDA2010-20170 7.5 15

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Ground subsidence mapstudy areas shown in blue

ToltecButtes

SacatonButte

Santa RosaWash

Pete'sCorner

Heaton

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Picacho

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Notice The State of Arizona has made a reasonable effort to ensure the accuracy of this map when it was produced, but errors may be present and the state of Arizona does not guarantee its accuracy. The map supplements, and is not a substitute for, a professional inspection of property for defects and conditions.

Introduction This is one of a series of earth fissure maps prepared by the Arizona Geological Survey (AZGS) in accordance with Ariz. Rev. Stat. § 27-152.01(3). AZGS collected location information from previously conducted earth fissure studies, reviewed available remote-sensing aerial and satellite imagery, and conducted surface site investigations throughout the study area. A reasonable effort was made to identify all earth fissures in the study area. Nonetheless, some fissures may remain unmapped as a result of one or more of the following:

1) Existing fissures may have been masked by construction or agricultural activities.

2) Incipient fissures may lack clear surface expression. 3) The surface expression of fissures changes

constantly as new earth fissures develop and old earth fissures fill in. A blank area on the map does not guarantee earth fissures are not present. However, blank areas within the study area boundary have been investigated, and no surface evidence of fissures was found as of the date of map publication. Determining the presence or absence of a fissure at any specific site may require additional mapping and/or geotechnical analysis.

Air photo base compiled from 2015, 1 meter NAIP (National Agriculture Imagery Program) digital ortho imagery.

Transportation network dataset compiled by Arizona State Lands Dept. by combining the 2007 County Road Data of Maricopa, Pima, Pinal and Cochise Counties with the Census 2000 Tiger/Line Data of the remaining Counties. Map projection and blue, 1000-meter grid ticks: Universal Transverse Mercator, zone 12. North American Datum of 1983 HARN Subsidence data provided by the Arizona Department of Water Resources (ADWR) Interferometric Synthetic Aperture Radar (InSAR), Hydrology, and Geophysics / Surveying Unit. Subsidence data for other locations and time periods is accessible at http://www.azwater.gov/AzDWR/Hydrology/GroundwaterandLandSubsidence.htm Shaded relief basemap produced from 10m NED Digital Elevation Model

References Arizona Department of Water Resources (ADWR), 2017, Radarsat-2 Interferometric Synthetic Aperture Radar, Hydrology, Geophysics/Surveying Unit Carpenter, M.C., 1991, Earth-fissure movements associated with fluctuations in ground-water levels near Picacho Mountains, south-central Arizona, 1980-84: U.S. Geological Survey Open-File Report 90-0561, 64 p. Cook, J.P., 2017, Discovery of a large earth fissure in the Southern Picacho Basin, Pinal County, Arizona. Arizona Geological Survey Open-File Report, OFR-17- 01, 7 p., 1 appendix. Harris, R.C., 1994, A reconnaissance of earth fissures near Apache Junction, Chandler Heights, and southwestern Picacho Basin: Arizona Geological Survey Open-File Report OFR-94-11, 5 p., 2 sheets, scales 1:24,000 and 1:26,700. Harris, R.C., 1999, Field Guide to Earth Fissures and other Land Subsidence Features in Picacho Basin. Arizona Geological Survey Open File Report, OFR-99-26, 55 p. Laney, R.L., Raymond, R.H., and Winikka, C.C., 1978, Maps showing water-level declines, land subsidence, and earth fissures in south-central Arizona: U.S. Geological Survey Water-Resources Investigations Open-File Report WRI 78-0083, 2 sheets, scale 1:125,000. NAIP Orthoimagery (1-Meter GSD), 2017, USDA-FSA-APFO Aerial Photography Field Office, Salt Lake City, Utah.

Earth Fissure Map of the Tator Hills Study Area:Pinal County, Arizona

June 2019Arizona Geological Survey

Digital Map Series - Earth Fissure Map 11 (DM-EF-11)version 3.0