1/6/2024 0 Comments Subduction zone(2016) plate model, obtained from our subduction zone analysis script and visualised in GPlates. The continental crust is thicker and more buoyant than the oceanic crust so the oceanic crust subducts beneath the continental crust. Subduction zones (black with teeth) with updated sections indicated with arrows at present day from the Matthews et al. A subduction zone forms when continental crust and oceanic crust collide. Our main emphasis is on the Hikurangi subduction zone where we find a spectrum of plate boundary slip processes, including steady creep, episodic slow slip. Subduction zones (red with teeth) and plate boundaries (black) according to the Bird (2003) global plate boundaries dataset.įigure 2. The discrepancy between our estimate (Figure 2) and that of Bird (2003) (Figure 1) represent minor differences in the definitions of subduction zones in the Mediterranean and Arabian regions, Banda Sea near the northwest Australian shelf, the East Philippine arc south of Luzon and the Mussau Trench (Figure 2).įigure 1. Our calculated present day subduction zone lengths are 61 940 km, which is 40 km greater than the Bird (2003) estimate (61 900.8 km). Gulf of Alaska to Kamchatka, marks the place where the Pacific plate is being subducted beneath the North American plate. The subduction zone, accordingly, is the antithesis of the mid-oceanic ridge. The modelled results we obtained for subduction zone lengths for present day correspond well with the estimates from Bird (2003). subduction zone, oceanic trench area marginal to a continent in which, according to the theory of plate tectonics, older and denser seafloor underthrusts the continental mass, dragging downward into the Earth’s upper mantle the accumulated trench sediments. This was achieved using a combination of ArcGIS and our subduction zone analysis tools. (2016) plate kinematic model (Figure 2) can be relied upon to represent subduction zone length variations through time, we measured plate boundaries from the Bird (2003) global plate boundary data set (Figure 1). In order to see how well the Matthews et al.
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