Subsidence maps over the recently identified subsidence features in the Holbrook basin are now available from the Arizona Dept. of Water Resources. ADWR has started collecting regularly scheduled InSAR data for monitoring these features.
The subsidence areas are the bright colored areas (indicating amount of subsidence over a 4-year period) at right center in the map.
AZGS and ADWR have been working together to identify, characterize, and monitor activity in the area.
The area is underlain by the Holbrook salt deposit, which is undergoing subsurface dissolution along its western margin, resulting in collapse of the overlying sediments, with the folded layers forming the Holbrook anticline.