Relationship between outer forearc subsidence and plate boundary kinematics along the Northeast Japan convergent margin

摘要: [1] Tectonic erosion along convergent plate boundaries, whereby removal of upper material the subduction zone interface drives kilometer-scale outer forearc subsidence, has been purported to explain evolution nearly half world's margins, including part history northeast Japan. Here, we evaluate role boundary dynamics in driving subsidence northeastern A synthesis newly updated analyses timing and kinematics deformation, convergence Japan trench demonstrate that onset rapid fore-arc tectonic is contemporaneous with extension during opening Sea an acceleration rate at trench. In Plio-Quaternary time, relative uplift contraction across arc a decrease rate. The coincidence these changes forearc, arc, backarc system appears require explanation scale entire boundary. Similar observations other western Pacific margins suggest correlations between major are rule, rather than exception. We significant component margin not consequence basal erosion, but instead reflects dynamic geometry driven by temporal variations kinematics. If correct, this model requires reconsideration mass balance crustal recycling continental crust nonaccretionary margins.