The probable explanation lies in the rate of convergence between the Juan de Fuca and North American plates, which converge at to per year, about half the rate of convergence from seven million years ago.
The probable explanation lies in the rate of convergence between the Juan de Fuca and North American plates. Convergence between the Juan de Fuca and North American plates converge at to per year. This is about half the rate of convergence from seven million years ago.