Overview of Mt. Bulusan

Mount Bulusan, or Bulusan Volcano, is the southernmost volcano on Luzon Island in the Republic of the Philippines. It is situated in the province of Sorsogon in the Bicol region, 70 km (43 mi) southeast of Mayon Volcano and approximately 250 km (160 mi) southeast of the Philippine capital of Manila.

Here are its features:

PHYSICAL FEATURES

Elevation:  1.559 km

Base Diameter:  15 km

Type of Volcano:  Stratovolcano formed inside a caldera

Hotsprings:  San Benon Springs, Mapaso Springs, San Vicente Springs, Masacrot Springs

Craters and Fissure:

1. Crater No. 1 or Blackbird Lake - 20 m in diameter and 15 m deep

2. Crater No. 2 - roughly oval in shape, 60 m by 30 m and 15 m deep

3. Crater No. 3 - approximately 90 m in diameter and 20 m deep

4. Crater No. 4 - near the NE rim, opened during the 1981 eruption

Fissure - located below Crater No. 4, measuring 5 to 8 m wide and about 100 m long

Adjacent Volcanic Edifice:  Mt. Homahan, Mt. Binitacan, Mt. Batuan, Mt. Calungalan, Mt. Calaunan, Mt. Tabon-Tabon, Mt.Juban and Mt. Jormajan

GEOLOGICAL FEATURES

Rock Type:  Two-pyroxene andesite in Bulusan, dacite associated with caldera

Tectonic Setting:  Bicol Volcanic Chain

     Date of eruptive deposits:

              a) 1500 - 5800 years based on material from pyroclastic deposits

              b) 30K+  for caldera deposits

Mt. Bulusan's eruption last February 2011

Bulusan is generally known for its sudden steam-driven or phreatic explosions. It has erupted 15 times since 1885 and is considered as the 4th most active volcano in the Philippines after Mayon, Taal, and Kanlaon.


Sources:
http://en.wikipedia.org/wiki/Mount_Bulusan
http://www.phivolcs.dost.gov.ph/html/update_VMEPD/Volcano/VolcanoList/bulusan.htm