In 2019 a University of Washington team produced an 81-page white paper laying out the science case, engineering options, and implementation plan for a permanent offshore geophysical monitoring network on the Cascadia subduction zone. The COSZO project that followed is a direct outgrowth of that study.
Citation
Schmidt, D., W. Wilcock, R. LeVeque, F. Gonzales, G. Cram, D. Manalang, M. Harrington, E. Roland, and P. Bodin (2019). Earthquake and Tsunami Early Warning on the Cascadia Subduction Zone: A Feasibility Study for an Offshore Geophysical Monitoring Network. University of Washington, Seattle, 81 pp. [UW handle]