It's not directly on a tectonic plate boundary. The closest boundary is the Juan de Fuca Ridge which is a divergent plate boundary where the Juan de Fuca Plate (a smaller plate) is moving away from the North American Plate. This boundary is located offshore, west of Vancouver Island, where Nanaimo is located.

While Nanaimo isn't right on a boundary, it's close enough to experience some of the effects of plate tectonics, including:

* Earthquakes: The Juan de Fuca Ridge is an active zone for earthquakes, and Nanaimo has experienced several moderate earthquakes over the years.

* Volcanic Activity: The Juan de Fuca Plate is subducting (sliding) under the North American Plate, which can lead to volcanic activity. Mount Garibaldi, a dormant volcano, is located north of Nanaimo.

It's important to remember that plate tectonics is a complex and dynamic process, and the location of Nanaimo makes it susceptible to the effects of plate movement.