Like other volcanoes around the Pacific Ocean, Mayon is a part of the Pacific Ring of Fire. It is on the southeast side of Luzon. The Bicol Arc is one of 7 oceanic trench subduction zones defining the Philippine Mobile Belt. Volcanism in the Bicol Arc is related to the westward subduction of the Philippine Plate along the Philippine Trench. The 12 active and inactive volcanoes within the arc include the Mayon Volcano, Mount Isarog, Mount Iriga, Malinao Volcano, and Mount Masaraga. In general, these are calc-alkali basalts, basaltic andesites, and andesites.