Map of the Cascadia subduction zone

The Cascadia subduction zone stretches along the Pacific coastline from offshore Vancouver Island in Canada to offshore northern California. Red circles denote known locations of seafloor methane seeps. White and yellow crosses are locations of ROV dives to explore these methane seeps, with yellow crosses corresponding to sites visited by the R/V Falkor and ROV SuBastian in summer 2019.  The orange line denotes the 1000 m depth contour.