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The Manila Trench was formed by the subduction of the Eurasian Plate underneath the Philippine Sea Plate, which initiated during the Middle Miocene (22-25 million years ago). A characteristic feature of this plate boundary is the gradual change from normal subduction (on the southern margin) to a collisional regime (on the northern margin ...
The trough is a well-developed basin with active subduction into the Manila Trench system with complexities stemming from the offshore extension of the Philippine Fault System into the trough. Multi-channel seismic data suggests that the basin's sedimentary deposits resulted from multiple periods of emplacement and erosion .
The trench formed from a collision between the Palawan and Zamboanga plates. This caused a change in geological processes creating a subduction zone, that is dropping the ocean floor deeper. [15] The rate of subduction on these plates is estimated to be about 15 cm per year. [2] A convergent zone borders an estimate of 45% of the Philippine ...
Subduction of Late Oligocene to Early Miocene South China sea oceanic crust occurs at the Manila Trench. Subduction of Eocene Philippine Sea oceanic crust occurs at the East Luzon Trough – Philippine Trench system. The strike-slip, left lateral fault, Philippine fault system is associated with the northward movement of the belt. [14]
The Manila Trench results from eastward subduction of the Eurasian plate (Sundaland Block) beneath the western side of the Philippine Mobile Belt. Subduction along the north-trending trench started in late Oligocene to early Miocene. [4] [23] [24] It has an average subduction rate at 1–2 cm (0.39–0.79 in) per year, slowing towards the north ...
The Eurasian plate is subducting under the Philippine Mobile Belt at the Manila Trench. The Sunda plate is subducting under the Philippine Mobile Belt at the Negros Trench and the Cotobato Trench. The oceanic Australian plate is subducted beneath the continental Sunda plate along the Sunda Trench.
The earthquake occurred as a result of shallow oblique-thrust faulting likely along the subduction interface of the Philippine Trench. At this location, the Philippine Sea plate moves west-northwest at a rate of about 103 mm (4.1 in) per year with respect to the Sunda plate. A finite fault model suggests rupture occurred around an elliptical ...
The subduction zones that surround most of the archipelago are the source of many of the larger earthquakes that strike the Philippines. This includes both faulting along the plate interfaces and within the subducting slabs. For the Philippine Trench, examples of those on the plate interface are the 1988 M w 7.3 and the 2023 M7.6 events.