The geologic history of the Southern Hydrate Ridge has been reconstructed through seismic imaging, which provides constraints on the origin of methane ice deposits found in this region. Hydrate Ridge is in a region where faults along the Cascadia Margin transition from seaward-verging to landward-verging. This fault reorientation corresponds to the transition from sedimentary accretion to subduction in this active accretionary margin. Seaward-verging thrust faults characterize the ridge deformation front, extending down to ~7 km beneath the summit. Initiation of the uplift of Southern Hydrate Ridge is predicted to have initiated about 1 million years ago.