Mount Bulusan, or Bulusan Volcano, is the southernmost volcano on Luzon Island in the Philippines. It is found in the province of Sorsogon in the Bicol region 70 km southeast of Mayon Volcano and approximately 250 km southeast of the Philippine capital of Manila.
It has four craters and four hot springs. Crater No. 1, called Blackbird Lake, is 20 m in diameter and 15 m deep. The oval Crater No. 2 is 60 m by 30 m and 15 m deep. Crater No. 3 is about 90 m in diameter and 20 m deep and Crater No. 4, which is near the northeastern, rim opened during the 1981 eruption. There is also a 100-meter fissure measuring 5 to 8 m wide below Crater No. 4.
Its hot springs are San Benon Springs, Mapaso Springs, San Vicente Springs, Masacrot Springs
Its adjacent volcanic edifices are Mt. Homahan, Mt. Binitacan, Mt. Batuan, Mt. Calungalan, Mt. Calaunan, Mt. Tabon-Tabon, Mt. Juban, and Mt. Jormajan.
See below: Active volcanoes in the Philippines
The Philippine Institute of Volcanology and Seismology (Phivolcs) declared Alert Level 1 on March 19, 2006 after it recorded increased seismic unrest. On June 8, 2006, volcanologists raised Alert Level 2 (moderate level of seismic unrest) after it spewed ash. On June 9, the resulting ash cloud damaged a number of houses in the nearby town of Casiguran, 5 km north of the volcano, and reached Sorsogon City, about 20 kilometres north of Bulusan.
On June 13, 2006, volcanologists said new craters were created by the mild explosions of Mt. Bulusan. Aside from the new craters, two of the volcano's four craters appeared to have merged and cracks were observed on the crater on the western side of the summit. Another eruption took place on April 8, 2007
There are evacuation procedures in place for parts of the peninsular, the farms nearest the volcano have been evacuated and many of the village schools are closed as it is considered possible that a more destructive eruption could occur.