We are witnessing development of active subduction mechanism
We can summary progressed as active of a subsuction mechanism on some seismic events observed for microplate env. with selective events realised at JuandeFuca Spreading Center(By the way,I especially cite to selective M5.0 env. events with Spreading Center informations of Dec 9) https://www.researchgate.net/publication/236589693_Rapid_dike_emplacement_leads_to_eruptions_and_hydrothermal_plume_release_during_seafloor_spreading_events https://www.wikiwand.com/en/Mendocino_Triple_Junction https://www.usgs.gov/media/images/subduction-juan-de-fuca-plate-beneath-north-american-pla https://www.geologyin.com/2019/08/a-tectonic-plate-is-dying-under-oregon.html?m=1 https://en.m.wikipedia.org/wiki/Blanco_Fracture_Zone