Iraya is a heavily forested stratovolcano, with an elevation of 1,009 metres (3,310 ft) asl, and a base diameter of 5,500 metres (18,000 ft).
Adjacent volcanic edifice is Mt. Matarem.
Mount Iraya last erupted in 1454, and the Philippine Institute of Volcanology and Seismology (Phivolcs) considers it as one of the active volcanos in the Philippines.
In 1998, volcanologists recorded seismic swarms which led them to form a monitoring network on Batan Island for several months. After the swarms of tremors had diminished, the temporary stations in Brgy. San Joaquin in Basco, Batanes and another near the crater, were pulled out. Seismicity or any activity relating to Iraya is still monitored by the Basco Seismological Station.
Volcanos of the Philippines are all part of the Pacific ring of fire.