disclaimer: I'm not an expert, but I've been watching some geology lectures focused on the pacific northwest [1] for fun recently.

This is on the Jaun de Fuca Ridge, on the other edge of the Juan de Fuca plate [2] from the Cascadia subduction zone, so it's related in the sense that it's the same tectonic plate, and the plate is very small (as far as I understand, it's a remnant of a plate that has been subducting under North America for a very long time). It is not (in my very-non-expert opinion) necessarily related in a direct sense to what is happening in the subduction zone.

[1]: e.g: https://www.youtube.com/playlist?list=PLcKUIuDhdLl92gfymRabw... [2]: https://en.wikipedia.org/wiki/Juan_de_Fuca_Plate