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 GPS and InSAR data from 2000 to 2010 and found the rate of subsidence on the order of 1 – 4 mm per year. [Source: CBS News via Geology.com. Image: Wikipedia/Saffron Blaze]
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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)