Many intraplate earthquakes of smaller magnitude also occur very regularly due to the interaction between the major tectonic plates in the region.

The convergence across this boundary is strongly oblique and the strike-slip component is accommodated by movement on the left lateral Philippine fault system.

[1] The Sunda plate carries with it parts of the Palawan Microcontinental Block, which has collided with the mobile belt at the Negros and Cotabato trenches.

One of the largest historical earthquake on the fault zone was the 1990 Luzon Ms  7.8 event that left nearly 2,000 people dead or missing.

The greatest shaking hazard comes from shallow crustal faulting close to the Manila, Davao and Cebu metropolitan areas.

Using the same parameters Metro Davao has the higher value of 0.45 g. The metropolitan area sits close to shallow faults of left lateral strike-slip and oblique reverse type, and these generate the greatest hazard, although a significant contribution comes from sources in the Halmahera and Philippine subduction zones.