New and updated earth fissure maps For Maricopa, Pinal, and Cochise counties

This article is reposted from http://arizonageology.blogspot.com/

AZGS has released six revised and upated earth fissures in south-central and southeastern Arizona for parts of Maricopa, Pinal and Cochise Counties. A single new earth fissure map for just east of the Picacho Mountains in Pinal County was issued.

Updated earth fissure study area maps, include: Luke and Chandler Heights in Maricopa County; Picacho and Friendly Corners (3 map sheets) and Santa Rosa Wash in Pinal County; and North Sulphur Springs Valley and Dragoon Road study areas in Cochise County.

The maps and digital data are available at the Natural Hazards of Arizona viewer. Individual fissure study area maps are online at the Arizona Geological Survey’s Online Document Repository. AGoogle Earth .kmz file is available for viewing the fissures on Google Earth.

All new or revised earth fissure maps employ a base map displaying National Agriculture Imagery Program aerial photography and, when available, a local subsidence map, provided courtesy of the Arizona Department of Water Resources.

A new fissure line category (yellow lines) portrays select fissures as confirmed that were otherwise not mapped by AZGS’ fissure mapping team. These include fissures mapped by reliable sources and those identified on multiple aerial photographs. Previously, if fissures could not be identified during field checks, the fissure was reported as unconfirmed.

Besides posing a threat to infrastructure, fissures are frequently used for illegal dumping of tires, appliances, construction debris, manure and other sundry items.  Because fissures extend downward towards the groundwater table, they represent a potential conduit for surface runoff to contaminate aquifer resources.

AZGS’s earth fissure mapping team will continue to monitor existing earth fissures and map new ones as they form.  AZGS geologists collaborate with hydrologists from the Arizona Dept. of Water Resources to better understand where and when fissures will occur, and with local environmental and geological engineers on ways to mitigate and minimize the impact of earth fissures.

See also:

Arizona Geological Survey, 2016, Earth Fissure Map of the Chandler Heights Study Area: Pinal and Maricopa Counties, Arizona: Arizona Geological Survey Digit Map – Earth Fissure Map 1 (DM-EF-1) v. 3.0, map scale 1:24,000.

Arizona Geological Survey, 2016, Earth Fissure Map of the Picacho Mountains SE Study Area: Pinal County, Arizona. Arizona Geological Survey Digital Map DM-EF-17 v 1.0, map scale 1:24,000.

Arizona Geological Survey, 2011, Earth Fissure Map of the Santa Rosa Wash Study Area: Pinal County, Arizona: Arizona Geological Survey Digital Map – Earth Fissure Map 19 v2.0 (DM-EF-19), map scale 1:24,000

Arizona Geological Survey, 2014, Earth Fissure Map of the North Sulphur Springs Valley Study Area, Cochise County, Arizona. Arizona Geological Survey Digital Map Series – Earth Fissure Map 26 (DM-EF-26 v2.0), map scale 1:24,000

Arizona Geological Survey, 2016, Earth Fissure Map of the Picacho & Friendly Corners Study Area: Pinal County, Arizona v. 3.0. Arizona Geological Survey Digital Map – Earth Fissure (DM-EF-03, v3.0), 3 map sheets, 1:24,000 map scale.

Arizona Geological Survey, 2016, Earth Fissure Map of the Dragoon Road Study Area: Cochise County, Arizona: Arizona Geological Survey Digital Map – Earth Fissure Map 16 v. 2.0 (DM-EF-16 v 2.0), map scale 1:24,000.

Arizona Geological Survey, 2016, Earth Fissure Map of the Luke Study Area: Maricopa County, Arizona: Arizona Geological Survey Digital Map – Earth Fissure Map 8 v 3.0 (DM-EF-8 v 3.0), map scale 1:24,000.

Arizona Geological Survey, 2016, Locations of Mapped Earth Fissure Traces in Arizona, v.01.31.2016. Arizona Geological Survey Digital Information (DI-39 v. 01.31.2016), shapefile and Google Earth .kmz file.

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One comment

  1. Very interesting post and links – thank you! While I’m only generally interested in geology I find this fascinating. I often wonder how earthquakes in other parts of the word change the ground beneath out feet locally…

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