The Manila Trench is a NS trending trench formed by east-dipping subduction of the Sundaland block beneath the Philippine Sea Plate on the north segment and beneath the Philippine Mobile Belt on the south segment. Both the north and south ends of the Manila Trench are terminated by arc-continent collision. To the north, Taiwan island was formed by the Chinese continental shelf collided with the Luzon Arc since Pliocene. To the south, Mindoro island was formed by the Palawan Continental Block indented into the Philippine Mobile Belt since Early Miocene. Both Taiwan and Mindoro represent transitions from subduction to collision and both exhibit absence of deep earthquakes in the upper mantle beneath with the potential exist of aseismic slab subducted earlier. While the upper mantle structures beneath Taiwan have been studied by seismic tomography and teleseismic waveforms, those beneath Mindoro are relatively largely unexplored. In this proposal, in addition to compare slab geometries and seismic moment release rates of deep earthquakes at both ends of the Manila Trench, we will investigate the upper mantle structures beneath Mindoro using teleseismic relative arrival times as recorded bythe broad array around NW Mindoro we deployed earlier.
|Effective start/end date||1/08/16 → 31/07/17|
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