Hawk Rock Subsidence Feature 2004 - 2008 Interferogram
Geologic Hazards

Arizona Land Subsidence Monitoring Report

The Arizona Department of Water Resources has an excellent program to monitor a somewhat unique geologic hazard – land subsidence. Caused by compaction of valley sediments in areas of declining groundwater table, it can create […]

The Rialto Bridge over Venice's Grand Canal
Geologic Hazards

City of Venice still sinking, study says

Most previous studies have indicated that the ground subsidence has stabilized under the famous City of Venice, Italy. However a recent study published in March indicates this may not be the case. The researchers used […]


Suggested Guidelines for Investigating Land Subsidence and Earth Fissure Hazards in Arizona
Available Resources

Suggested Guidelines for Investigating Land Subsidence and Earth Fissure Hazards in Arizona

From the AZGS Document Repository: These guidelines provide professionals evaluating site-specific conditions in areas known or suspected to be subsiding with a standardized minimum level of investigation for land-subsidence and earth-fissure hazards. The guidelines do […]

No Picture
Weekend CUP

Weekend CUP for April 13, 2010

Subsidence Beneath a UK Sports Stadium | Geology.com Widespread landslides in Rio de Janeiro and Niteroi in Brazil – Dave’s Landslide Blog Contractor Cleared to Start Tunnel On Hetch Hetchy System Program – ENR: Engineering […]


Geologic Hazards

Arizona Geologic Survey Releases Earth Fissure Maps

Yesterday the Arizona Geologic Survey (AZGS) released the first two of their 1:12,000 series earth fissure maps to the general public. The mapping program, perhaps the first of its kind in the country, came about after an earth fissures opened up in 2005 near Queen Creek, AZ, southeast of metropolitan Phoenix received much media attention. As a result, the Arizona Legislature passed House Bill 2639 of the 2006 Legislative Session that tasked the AZGS with mapping earth fissures and providing the data to the State Land Department for eventual delivery to property owners in Arizona. More after the break. (At left, the Apache Junction study area map, AZGS) 

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Geologic Hazards

New White Paper on Earth Fissures

The Arizona Land Subsidence Group (ALSG) has just released a white paper entitled "Land Subsidence and Earth Fissures in Arizona". More details after the break. (Photo courtesy of NCS Consultants, LLC)

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Geologic Hazards

Arizona Earth Fissure Planning Maps

According to Lee Allison’s Blog (Lee is the head of the Arizona Geological Survey and the Arizona State Geologist), the AZGS has released earth fissure maps of 4 Arizona Counties suitable for planning purposes. Read on for more details.

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