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In subduction zones, onshore geodesy provides the main data used to map seismic locking on the plate interface. We propose a new offshore control by establishing the co-location of the shelf break and the locking depth based on the Cascadia subduction. The erosive shelf of a subduction margin results from continuous uplift and active wave erosion. The long-term uplift is driven by 1) the non-recoverable fraction of interseismic deformation and 2) continental uplift (e.g. isostasy). We combine adoi:10.31223/osf.io/uwzbr fatcat:ccy3rqn7yfcgtplf5dnei6aqky