Dr. Andy Freed

Assistant Professor

E-mail: freed@purdue.edu

Associated Website(s): Home Page, Geodynamics & Active Tectonics (GAT)

Education

Ph.D. - Geophysics, University of Arizona, 1998
M.S. - Applied Mechanics, Utah State University, 1988
B.S. - Mechanical Engineering, Cornell University, 1983

Research Interests

My main research interests are focused on inferring the viscoelastic strength of the lower crust and upper mantle, determining how this rheology influences the evolution of stress through the earthquake cycle, and understanding how this evolution influences earthquake occurrence. I use GPS and other geodetically observed surface deformations to constrain 3-D finite element models of coseismic, postseismic. and interseismic processes. My work also extends to planetary science and the fate of subducting slabs.

Teaching Interests

Courses taught include: Successful Proposal Writing, Geodynamics, Applied 3-D Finite Element Modeling, Earthquakes and Volcanoes, and Geosciences in the Cinema

Grants

  • Contemporary strain and stressing rates in central and southern Alaska through the earthquake cycle, National Science Foundation, Award No. 0710937-EAR, July, 2007 to June, 2009, $152,000.

  • Accelerating moment release in areas of high stress? Southern California Earthquake Center, Award No. 119518, February 1, 2007 to January 31, 2008, $9,000, Co-PI: R. Bürgmann.

  • Inference of crustal rheology from observations of postseismic deformation following the 2004 Parkfield, California earthquake, Southern California Earthquake Center, Award No. 101574, February 1, 2005 to January 31, 2006, $15,000, Co-PI: R. Bürgmann.

  • Kinematic constraints on mantle-lithosphere interactions in Eastern Africa, National Science Foundation, Award No. 0538119-EAR, March, 2006 to February, 2010, $530,000, PI: E. Calais.

  • Collaborative Research: GPS measurements and deformation modeling of oblique subduction and strain partitioning in the northeastern Caribbean, National Science Foundation, Award No. 040947-EAR, July 1, 2004 to June 30, 2007, $286,000, PI: E. Calais.

  • Collaborative Research: Mechanisms of postseismic deformation following the 2002 Denali Fault earthquake sequence, National Science Foundation, Award No. 0309620-EAR, June 1, 2003 to May 31, 2006, $313,000, PI: E. Calais.

  • Evolution of stress along the southern San Andreas Fault system for the past two centuries, United States Geological Survey, Award No. 03HQGR0082, July 1, 2003 to June 30, 2005, $60,000, Co-PI: Bürgmann

  • Constraining Non-linear Lithospheric Flow Laws from Post-Landers and Post-Hector Mine SCEC GPS Measurements, Southern California Earthquake Center, February 1, 2002 to January 31, 2003, $15,000, CoPI: Bürgmann.

  • Collaborative Research: Modeling of 3D viscoelastic stress transfer in the California crust: Implications for earthquake triggering and seismic hazard migration, National Science Foundation, Award No. 0122868-EAR, August 1, 2001 to December 31, 2004, $109,000, Co-PI: J. Lin.

  • Three-dimensional modeling of lower crustal flow following earthquakes, National Science Foundation, Earth Sciences Postdoctoral Research Fellowship, Award No. 9704677-EAR, 1998-2000, $72,000.

Professional Experience

  • Assistant Professor of Earth and Atmospheric Sciences, Purdue University, 2003

  • 2001 - 2003 Visiting Postdoctoral Researcher, Berkeley Seismological Laboratory, Berkeley, CA

  • 1998 - 2001 NSF Postdoctoral Fellow, Carnegie Institution of Washington, Washington, DC

Selected Publications

  • Freed, A. M., Afterslip (and only afterslip) following the 2004 Parkfield, California earthquake, Geophys. Res. Lett., 34, doi10.1029/2006GL029155, 2007.

  • Freed, A. M., S. T. Ali, and R. Bürgmann, Evolution of stress in southern California for the past 200 years from coseismic, postseismic, and interseismic processes, Geophys. J. Inter., 169, 1164-1179, 2007.

  • Freed, A. M., R. Bürgmann, E. Calais, J. Freymueller, Stress-dependent power-law flow in the upper mantle following the 2002 Denali, Alaska, earthquake, Earth Planet. Sci. Lett., 252, 481-489, 2006.

  • Freed, A. M., R. Bürgmann, E. Calais, J. Freymueller, and S. Hreinsdóttir, Implications of deformation following the 2002 Denali, Alaska earthquake for postseismic relaxation processes and lithospheric rheology, J. Geophys. Res., 111, B01401, doi10.1029/2005JB003894, 2006.

  • Freed, A. M., Earthquake triggering by static, dynamic, and postseismic stress transfer, An. Rev. Earth Planet. Sci., 33, 335-367, 2005.

  • Freed, A. M. and Bürgmann, R., Evidence of power-law flow in the Mojave Desert mantle, Nature, 430, 548-551, 2004.

  • Lin, J. and Freed, A. M., Time-dependent viscoelastic stress transfer and earthquake triggering, In: Environment, Natural Hazards, and Global Tectonics of the Earth, ed. Y.J. Chen, Advances in Earth Sciences Monograph, 2, 21 - 38, Higher Education Press, Beijing, 2004.

  • Freed, A. M. and J. Lin, Accelerated stress buildup on the southern San Andreas Fault and surrounding regions caused by Mojave Desert earthquakes, Geology, 30, 571-574, 2002.

  • Dombard, A. J., and A. M. Freed, Thermally Induced Lineations on the Asteroid Eros: Evidence of Orbital Transfer, Geophys. Res. Lett, 29, 1818, DOI 10.1029/2002GL015181, 2002.

  • Freed, A. M. and J. Lin, Delayed triggering of the 1999 Hector Mine earthquake by viscoelastic stress transfer, Nature, 411, 180-183, 2001.

  • Freed, A. M., H. J. Melosh and S. C. Solomon, Tectonics of mascon loading: Resolution of the strike-slip faulting paradox, J. Geophys. Res., 106, 20603-20620, 2001.

  • Freed, A. M. and J. Lin, Time-dependent changes in failure stresses following thrust earthquakes, J. Geophys. Res., 103, 24393-24409, 1998.

  • Freed, A. M., J. Lin, P. R. Shaw, and H. J. Melosh, Long-term survival of the axial valley morphology at abandoned slow-spreading centers, Geology, 23, 971-974, 1995.