Andrew Cyr

Andy is a Research Geologist in the Geology, Minerals, Energy, and Geophysics Science Center. He earned a B.S. from Allegheny College, a M.S. from Miami University, and a Ph.D. from Purdue University, in Geology. Since joining the USGS as a Mendenhall Postdoctoral Research Fellow in 2008 in Menlo Park, CA, Andy has focused on geomorphologic and tectonic problems.


Andy is currently the Project Chief for the Neotectonics of the Northern Mojave Desert effort, which is supported by the National Cooperative Geologic Mapping Program. In addition to coordinating the project team's geologic mapping, surface processes, and groundwater resources studies, Andy is helping to improve our understanding of earthquake hazards by evaluating recently active faults and folds related to the tectonics of the Pacific-North American plate boundary. A long-term goal of the team's work is to arrive at a new tectonic synthesis of the northeastern portion of the Eastern California Shear Zone.

Andy also conducts geomorphologic studies on the Channel Islands, southern California, in cooperation with the Channel Islands National Park. He applies surficial geologic mapping and cosmogenic nuclide analysis as part of a research team evaluating both 1) the impacts of grazing on the Channel Islands Landscape, and 2) earthquake and landslide hazards in this high-relief landscape.

Finally, Andy is also using cosmogenic nuclide surface exposure ages of glacial moraine boulders in the southern Rocky Mountains, Colorado, to provide the timing of fault rupture and rate of fault slip on range front faults in the Sangre de Cristo Mountains, as well as evaluate the timing of alluvial fan activity relative to the timing of deglaciation. Understanding when these different geomorphic and depositional systems are active relative to one another will improve our understanding of paleoclimate variability in the southern Rocky Mountains.

Professional Experience:

  • 2000 - 2001, Analytical Chemist, Alpha Analytical Labs, Westborough, MA;
  • 2008 - 2011, Mendenhall Postdoctoral Scholar, U.S. Geological Survey, Geology Minerals, Energy, and Geophysics Science Center, Menlo Park, CA;
  • 2011 - present, Research Geologist, U.S. Geological Survey, Geology Minerals, Energy, and Geophysics Science Center, Menlo Park, CA


  • Ph.D., Geology, Purdue University, 2008
  • M.S., Geology, Miami University (OH), 2004
  • B.S., Geology, B.S. Allegheny College, 2000


  • Geological Society of America
  • American Geophysical Union
  • American Geochemical Society

Non-USGS Partners:

  • Montana State University
  • Fort Irwin US Army Training Center
  • Channel Islands National Park 
  • Mojave National Preserve 
  • Desert Studies Center (California State University, Fullerton)