“…zones, and the Cascadia margin beneath is an unusually well-studied example (Baumberger, et al, 2018;Embley et al, 2017;Hautala et al, 2014;H. P. Johnson et al, 2019;Merle et al, 2021;Riedel et al, 2018;Salmi et al, 2011). Gas emissions are also identified in abundance on some passive coastal margins, although the mechanism for producing those methane seeps appears to differ from those present on subduction zone margins (Garcia-Tigreros et al, 2020;Mau et al, 2012Mau et al, , 2015Plaza-Faverola & Keiding, 2019;Ruppel & Kessler, 2017;Skarke et al, 2014).…”