Geohazards Group
The Geohazards Group's mission is to document and monitor geologic hazards associated with earth processes, such as earthquakes, landslides, wildfires, and volcanic activity, as well as geologic hazards associated with earth materials, such as soils, rock, rivers, and landforms.
We share our observations and research with civil authorities and land management agencies to inform their decision-making. Our collective goal is a stronger, more resilient Arizona.
Research Areas
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We study earthquake hazards across Arizona by mapping faults, analyzing seismic activity, and assessing areas at risk for ground shaking. We provide data, reports, and hazard maps that help communities, engineers, and planners make safer decisions about building and land use. Our work supports preparedness efforts and helps reduce the potential impacts of future earthquakes in the state.
Debris flow following the Pipeline Fire in Flagstaff in 2022
USGS
We study wildfire and post-wildfire hazards by mapping burn areas and identifying regions at risk for debris flows, flooding, and erosion after fires. We provide data and hazard assessments that help emergency managers and communities prepare for increased risks during monsoon storms. Our work supports safer land-use decisions and improves resilience in fire-affected landscapes.
We study landslides to understand their causes, distribution, and potential hazards across the state. We combine field mapping, aerial imagery, and geotechnical analysis to identify areas at risk, including the effects of geology, slope, and rainfall. This work informs hazard assessments, land-use planning, and mitigation strategies to reduce risks to communities and infrastructure.
Earth fissures and subsidence threatens people and livestock, damages homes, roads, dams, and canals, and reduces property values
We investigate ground fissures to document their locations, formation processes, and potential hazards. Our research focuses on understanding how tectonic activity, groundwater withdrawal, and soil or rock conditions contribute to fissure development. This information helps guide land-use planning, infrastructure design, and public safety measures in areas prone to ground cracking.