Monte Musuan

Musuan, also known as Calayo, is an isolated, low grass-covered andesitic-to-dacitic lava dome and tuff cone that rises above flat farmland in the province of Bukidnon in central Mindanao. Maso (1902) related that in a 1891 document a Jesuit priest had reported that a volcano, along the River Palangui near a waterfall and where the river forms a very narrow canyon with steep high banks, had "burst into eruption some four years ago and constantly emits vapors which burn everything about... there is no flow of lava, but it emits a column of smoke so sulphurous as to prevent any approach." Although Maso (1902) attributed this activity to Musuan, the geographic description does not match, so both the nature and location of this event is uncertain. PHIVOLCS at one time listed eruptions in 1866 and 1867, but had removed those eruptions as of 2020. A strong earthquake swarm occurred nearby in 1976.