(2016) plate model, obtained from our subduction zone analysis script and visualised in GPlates. Subduction zones (black with teeth) with updated sections indicated with arrows at present day from the Matthews et al. 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. The subduction zone, accordingly, is the antithesis of the mid- oceanic ridge. 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). Subduction is considered a primary driving force of plate tectonics, yet the interplay of the forces that control its initiation remains poorly understood. 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. Scientists are continuing their investigations and this may. The largest subduction zone earthquake was about 840 years ago and the most recent subduction earthquake was about 500 years ago. The modelled results we obtained for subduction zone lengths for present day correspond well with the estimates from Bird (2003). Studies from 22 sites along the Hikurangi subduction zone, have enabled scientists to uncover evidence of ten large earthquakes over the last 8,000 years. 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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