>>2021050>>2021129>>2021155Volcanos only appear outside of plate boundries when there's a "hotspot", a magma plume from the deep mantle. Hawaii is a chain because the plate has moved while the plume just pushes through regardless. Hotspot volcanism isn't super rare, but it's only possible through younger crust. The Canadian Shield which your island is on the border of, is a chunk of the earth's surface known as a "craton". Cratons are super old chunks of land that are so dense that vault lines and volcanos can't break through, which is why that part of NA has no volcanos today, same for Austrailia and south africa.
in summary: Volcanos are pretty much impossible there, much less 4 of them
