NAME OF VOLCANO:                        BILIRAN        

LOCATION:                                         Biliran Province, 12.3 km west of Caibiran town

                                                             (1139'N, 12432.1'E)

 

 

PHYSICAL FEATURES

Elevation:  1.34 km

Base Diameter:  140 km

Type of Volcano:  Volcano Island, cone   

Hotsprings:  Central Biliran-Libtong Thermal Areas (12 hot springs and one bubbling pool), North Biliran-Panamao Thermal Area, Anas Thermal Area, South Biliran-Kalambis Thermal Area

Adjacent Volcanic Edifice: Panamao (107 m asl), Gumansan (1064 m asl), Lauan (1187 m asl) and Suiro (1301 m asl)

 

 

GEOLOGICAL FEATURES

Rock Type:  Hornblende andesite containing greenish and black hornblende

Tectonic Setting:  Biliran Volcano is part of the curvilinear belt of Quaternary volcanoes in eastern Philippines, parallel to Phil.  Trench to the east    

 

 

VOLCANIC ACTIVITY

Number of Historical Eruptions:  1

Date:  1939 Sept. 26

Site:  crater

Eruption Character:  Debris avalanche (?)

Affected Areas: Ashfall at Caibiran and adjoining areas (6.35 cm thick deposits)

 

 

MONITORING ACTIVITY

 

An investigation was conducted by then Commission on Volcanology (now PHIVOLCS) on November 12, 1954 at Mt. Biliran to confirm reports published in local newspapers that the volcano was showing signs of volcanic activity.  Local earthquakes accompanied by rumbling sounds were reportedly felt at places near the volcano.  Furthermore, thick steam clouds rising from the volcano and drying up of vegetation at the upper slopes were reportedly observed by boat passengers and fishermen.  Data gathered, however, by the investigating team showed that no unusual volcanic activity took place.