“…The E-W to NW-SE strikes of most of these faults and the coincidence of some of these faults with the margins of similarly trending Tertiary basins and uplifts are thought to refl ect the N-S compression caused by northward transport of the Oregon block against a backstop of quasi-stable crust in southern British Columbia ( Fig. 1A; Wells et al, 1998Wells et al, , 2014Wells and Simpson, 2001;McCaffrey et al, 2007). From south to north, paleo seismic and geologic mapping studies have identifi ed surface deformation indicating Holocene activity on the Olympia and Tacoma faults in the Tacoma Basin (Bucknam et al, 1992;Sherrod, 2001;Sherrod et al, 2004aSherrod et al, , 2004bNelson et al, 2008;Barnett et al, 2010;Sherrod and Gomberg, 2014), the Seattle fault in the Seattle Basin (Bucknam et al, 1999;Johnson et al, 1999;Sherrod et al, 2000;Nelson et al, 2003aNelson et al, , 2003bNelson et al, , 2014Kelsey et al, 2008), the Southern Whidbey Island, Utsalady Point, and Darrington-Devils Mountain faults in the Everett Basin (Johnson et al, 1996(Johnson et al, , 2001(Johnson et al, , 2004Dragovich and DeOme, 2006;Sherrod et al, 2008), and the Boulder Creek, Birch Bay, Sandy Point, and Drayton Harbor faults in the Bellingham Basin (Kelsey et al, 2012;Sherrod et al, 2013;Sherrod and Gomberg, 2014).…”