Joshua Calkins

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.

Education
List of degrees from highest to lowest:
Ph.D. Geophysics
University of Arizona
07/2008
B.S. Geology
Colorado State University
12/1996
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