MGDS References
Calkins, J.A., G.A. Abers, G. Ekstrom, K.C. Creager, and S. Rondenay, "Shallow structure of the Cascadia subduction zone beneath western Washington from spectral ambient noise correlation", J. Geophys. Res., 116: , 2011, DOI 10.1029/2010JB007657. (View Reference)
