Skip to main content
Geologic map of McDowell Mountains, central Arizona
Fresh map layout of the geology of the McDowell Mountains, with cross section, correlation chart, and two dozen images.
Rifting in East Africa | Earth Fissures in Arizona
CBS News uses Arizona earth fissure images to contrast with large ground fracture in the East African Rift of Kenya.
Mead Slope Fault Mapping, Lake Mead, Arizona
AZGS geoscientists are engaged in studying the Mead Slope Fault of NW Arizona.
Shaking it up with AZGS’ Earthquake Fault Videos
Arizona has earthquakes and we have the video evidence to prove it
Wildcat Peak, Kaibito Plateau, Arizona – Prominent N-S trending Miocene dike complex
Wildcat Peak is an ancient volcanic feature largely destroyed by erosion. Miles of resistant N-S feeder dikes still outcrop nicely.
US Geological Survey's Proposed 2019 Budget Takes a Shellacking
US Geological Survey's 2019 could be slashed. The result would be a 25% reduction in staff and a marked reduction services in such areas as natural hazard assessment and geologic mapping.
Deadly debris flows in the SW U.S. fueled by drought, wildfire, and rain
The catastrophic debris flows that flattened Montecito, CA, are no stranger to Arizona. Just ask the residents below the Schultz Fire zone on the east flanks of Flagstaff's San Francisco Peaks.
Arizona Geology e-Magazine touts new earth fissure maps
New earth fissure maps released.
Arizona's Monsoon Season Drives Earth Fissure Activity
Oddly enough, Arizona has an earth fissure season; a season when fissures are more likely to first appear or undergo renewed activity. This article showcases revised earth fissure maps for parts of Cochise, Maricopa, and Pinal Counties, as well as case studies of one new (Tator Hills) and one reactivated fissure (Apache Junction). Systematic mapping and observations of the physical conditions of ‘older’ fissures suggests that earth fissure activity in some study areas is waning.
Subscribe to Geologic Hazards