Fault coupling is a critical component of the overall seismic cycle because regions of enhanced strain accumulation have frequently been spatially correlated with high coseismic slip. Relative plate motion is accommodated in earthquakes, slow slip transients, and longer term creep. The interaction of these different modes of motion are still not well understood (Walton et al., 2021). The canonical model of the subduction zone includes a highly coupled megathrust, composed predominantly of large velocity weakening asperities that are surrounded by velocity strengthening regions that may slip aseismically (Bilek et al., 2004;Lay et al., 2012). The moment of the earthquake scales with the area of slip on the fault. Cascadia has sparse seismicity and infrequent historic great earthquakes, however when great events occur, they rupture a significant area of the margin (Satake et al., 2003). It is unsurprising that in Cascadia the seismogenic section is highly coupled extending to depths of ∼20 km (

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