Mount Pinatubo is located in a subduction zone, specifically in the Philippine Mobile Belt. Here's a breakdown of the tectonic setting:

* The Philippine Sea Plate is being subducted (pushed) beneath the Eurasian Plate.

* This subduction process causes the melting of the mantle, generating magma that rises to the surface.

* The magma eventually erupts, forming volcanoes like Mount Pinatubo.

The subduction zone environment is known for its volcanic activity, and Mount Pinatubo's explosive eruption in 1991 is a testament to the powerful forces at play.