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No longer at LDEO: 
Adjunct Associate Research Scientist
Lamont-Doherty Earth Observatory
Seismology Geology and Tectonophysics


Fields of interest: 
earthquake seismology, tectonics, lithospheric structure, subduction zones

My work centers on using earthquake seismology as a tool for investigating the processes by which continental and oceanic plates interact and evolve at subduction zones. I'm currently using converted body waves, surface waves, and ambient noise to constrain lithospheric structure and seismic velocities in active subduction zones on the eastern Pacific margin and beneath the extinct arc of the Coast Mountains of western Canada.

List of degrees from highest to lowest:
Ph.D. Geophysics
University of Arizona
B.S. Geology
Colorado State University

Selected Publications:

Shear wave velocities in the Pampean flat-slab region from Rayleigh wave tomography: Implications for slab and upper mantle hydration Porter, R; Gilbert, H; Zandt, G; Beck, S; Warren, L; Calkins, J; Alvarado, P; Anderson, M J. Geophys. Res. 11/2012 Volume: 117 Issue: B11 (2012)
Shallow structure of the Cascadia subduction zone beneath western Washington from spectral ambient noise correlation Calkins, J.A.; Abers, G.A.; Ekström, G.; Creager, K.C.; Rondnay, S. Journal of Geophysical Research Volume: 116 Issue: B07302 (2011) doi:10.1029/2010JB007657
Characterization of the crust of the Coast Mountains Batholith, British Columbia, from P to S converted seismic waves and petrologic modeling Calkins, J.A.; Zandt, G.; Girardi, J.; Dueker, K.; Gehrels, G.; Ducea, M. Earth and Planetary Science Letters 11/2009 Volume: 289 p.: 11 (2009) 10.1016/j.epsl.2009.10.037
Crustal images from San Juan, Argentina, obtained using high frequency local event receiver functions Calkins, J.A.; Zandt, G.; Gilbert, H.J.; Beck, S.L. Geophysical Research Letters Volume: 33 (2006) 10.1029/2005GL025516