Biliran Volcano

Biliran is an solfataric active volcano located in the island province of Biliran in the Philippines. The volcano caused the formation of the island. 12.3 km west of Caibiran town  (11°39’N, 124°32.1’E)

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
  • Latest Eruption/Activity: September 26, 1939
  • Site: crater
  • Eruption Character: Debris avalanche
  • Affected Areas/Remarks: Ashfall at Caibiran and adjoining areas (6.35 cm thick deposits)
  • Monitoring activity: Short-term monitoring in 1954

Physical features

  • Hotsprings:
    1. Central Biliran – Libtong Thermal Areas (12 hot springs and one bubbling pool)
    2. North Biliran – Panamao Thermal Area
    3. Anas Thermal Area
    4. South Biliran – Kalambis Thermal Area
  • Adjacent Volcanic Edifice:
    1. Panamao (107 m asl)
    2. Gumansan (1064 m asl)
    3. Lauan (1187 m asl)
    4. Suiro (1301 m asl)

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.

The Philippines has a total of 23 active volcanoes, including one in Biliran.

Active Volcano in the Philippines

Source: Philvolcs

5M-Earthquake in Biliran

5.1 Earthquake, 13th August, 2016

EARTHQUAKE
5.1 Magnitude
10:05 pm 13th August 2016
Center located near Catmon Naval, Biliran

Reported Intensities

Intensity V – Naval, Almeria & Culaba, Biliran; Leyte, Leyte
Intensity IV – Tolosa and Calubian, Leyte
Intensity III – Mandaue City
Intensity II – Palo, Leyte; Masbate City
Intensity I – Cebu City

Instrumental Intensity:
Intensity II – Cebu City and Masbate City

August 13 Biliran Quake

August 13 Biliran Quake

Mt. Panamao

Mt. Panamao, solfataric active volcano located in the island province of Biliran in the Philippines.

Panamao Volcano presumably erupted in 1669, a milestone year in Tacloban history associated with a rain of ashes in this village in eastern Leyte. The ashfall could only have originated from this volcano since Mt. Mayon, the other nearby volcano mentioned in the Alcina manuscript, was not eruptive at that time.

Threshing harvested rice by foot within view of Mt. Panamao. Photo by Jalmz

Threshing harvested rice by foot within view of Mt. Panamao. Photo by Jalmz

The Panamao volcano caused the formation of the island.

The name of Biliran could be associated with the catastrophic eruption of Panamao Volcano.

Now, Panamao is a much-publicized mountaineer’s destination. It looks majestic and serene on clear and sunny days. It is also full of myths and legends that continue to be told among the natives.

Its fiery past can now be told.

Mt. Panamao in Pictures

 

Mt. Suiro

Mount Suiro is a 2,495 ft / 761 m mountain peak in Caibiran, Biliran, Philippines. Based on peakery data, it ranks as the 831st highest mountain in Philippines.

Mt. Suiro, the tallest mountain on Biliran Island located in the vicinity of Caibiran and Cabucgayan, as viewed from the Caibiran short cut road. Now a dormant volcano, it erupted in 1939.

Mt. Suiro, the tallest mountain on Biliran Island located in the vicinity of Caibiran and Cabucgayan, as viewed from the Caibiran short cut road. Now a dormant volcano, it erupted in 1939.

The description fits Mt. Suiro (Surio in the GVP website) in Caibiran town, the tallest peak southeast of the island, which became dormant after 1939.

An unnamed Internet blogger said that the 1939 eruption was from the crater and that it caused an avalanche of debris and 6.35 cm. thick ashfall at Caibiran and adjoining areas.

The known volcanic eruptions in Biliran in 1669, 1800 and 1939 present a pattern that such event occurs in the island every 130 years or so. Thus, the next eruption could possibly happen decades from now in 2069, but not in 2007.

Biliran Island has many thermal, mud pools and hot springs such as in Catmon, Libtong in Naval and the Mainit Hot Spring in Brgy. Villa Vicenta, Caibiran that have become popular tourist attractions in Eastern Visayas.

Mt. Suiro Trivia

Mt. Panamao erupted around 1669, not in 1939. The second recorded eruption in Biliran Island during historic time was around 1800, or 131 years later, and the volcano’s mouth was in the vicinity of the present drilling site of Biliran Geothermal, Inc., then called Tinago. The third volcanic eruption in the island was in 1939, or 139 years from the second one, and its mouth was in Mt. Suiro in Caibiran. – Prof. Rolando Borrinaga