Mount Pinatubo is a stratovolcano (also known as a composite volcano) located in the Zambales Mountains on the island of Luzon in the Philippines. It is characterized by its tall, conical shape formed by layers of lava, tephra, and volcanic ash
. It is a subduction-related volcano formed by the Eurasian Plate sliding under the Philippine Mobile Belt along the Manila Trench, which causes magma to rise and create explosive volcanic activity typical of stratovolcanoes
. The volcano has a complex history with an "ancestral" and "modern" phase, both involving andesite and dacite compositions typical of stratovolcanoes. The 1991 eruption was highly explosive, ejecting large volumes of material and forming a caldera, consistent with stratovolcano behavior
. In summary, Mount Pinatubo is an active stratovolcano formed by subduction processes, known for its explosive eruptions and layered volcanic structure
