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the oblique convergence between the Philippine Sea plate

Along the western side of the Philippine Sea plate lies the Philippine fault; a mega-fault caused by the oblique convergence between the Philippine Sea plate and the Sunda plate(part of the larger Eurasian plate). The fault extends for 1200km from the NW corner of Luzon down to the SE end of Mindanao (Figure 6; Yu et al. 2013). This left-lateral strike-slip fault has a long-term slip rate of 24-40mm/yr, but is currently fully locked. This poses dangerous threats to areas along the fault because it is unknown as to when the fault will slip and produce devastating consequences due to the highly populated areas of Luzon and Mandnao of 48.5 millionand 21.58 million people respectively. 
Figure 6. Demonstration of the Philippine Fault system on the western side of the Philippine Sea Plate.

Along the eastern side of the plate, the rate at which the Pacific plate subducts beneath the Philippine Sea plate ranges from 10 to 46mm/yr (USGS, Smoczyk et al. 2013). By examining the vertical profiles from the following USGS report, it can be noted that the Pacific plate is subducting beneath the Philippine Sea plate to great depths and at a very steep angle. This configuration produces several volcanoes and earthquakes along the boundary margin.