Carbon sequestration is a hot topic these days, and the Arizona Geologic Survey (AZGS) is working with a consortium of public and private agencies and non-profits to evaluate the potential of CO2 storage in Cenozoic basins in Arizona. The report is still very preliminary, but a number of deep sedimentary basins have been targeted for further investigation, including basins containing most of Arizona’s population centers like Tucson, Phoenix Metro, Casa Grande and Yuma. [Source: Arizona Geology via Arizona Geology Blog. Image: AZGS]
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Landslide on Arizona SR 87 Closes Highway
On March 21, 2008 a landslide caused the closure of Arizona State Route 87 between Payson and Phoenix near mile post 224. So far there are no official estimates as to the size, but based on aerial photos, it appears to be at least 50,000 sq-ft in plan. The offset at the head scarps was approximately 2-meters (6.6-ft) according to AZGS Geologists on site. It appears to have been a rotational slide as the toe of the landslide heaved the southbound roadway up by as much as 1-meter (3.3 ft). There was an existing soil-nail retaining wall on the slope that was destroyed by the slide as well. Lateral deformations can be seen in photos of the median barrier and the roadway striping. The deformations extended into the northbound lanes as well. More photos and links after the break. (Photo by ADOT)
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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 […]