Mandalagan is located at latitude 10.65° North (10°39'0"N), longitude 123.25° East (123°15'0"E), in the province
Provinces of the Philippines
The Provinces of the Philippines are the primary political and administrative divisions of the Philippines. There are 80 provinces at present, further subdivided into component cities and municipalities. The National Capital Region, as well as independent cities, are autonomous from any provincial...

 of Negros Occidental
Negros Occidental
Negros Occidental is a province of the Philippines located in the Western Visayas region. Its capital is Bacolod City and it occupies the northwestern half of Negros Island; Negros Oriental is at the southeastern half...

, on the north of the island of Negros, Region VI, of the Philippines
The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...


Mandalagan is a solfataric, fumarolic, potentially active stratovolcano
A stratovolcano, also known as a composite volcano, is a tall, conical volcano built up by many layers of hardened lava, tephra, pumice, and volcanic ash. Unlike shield volcanoes, stratovolcanoes are characterized by a steep profile and periodic, explosive eruptions...


Physical Features

Elevation is 1885 metres (6,184 feet), with a base diameter of 26 kilometres.

Mandalagan is a deeply dissected complex volcano
Complex volcano
A complex volcano, also called a compound volcano, is a volcano with more than one feature. They form because changes of their eruptive characteristics or the location of multiple vents in an area...

, with a highly altered volcanic dome.

Volcanic activity is reported to include seven volcanic centres, at least five craters
Volcanic crater
A volcanic crater is a circular depression in the ground caused by volcanic activity. It is typically a basin, circular in form within which occurs a vent from which magma erupts as gases, lava, and ejecta. A crater can be of large dimensions, and sometimes of great depth...

 and/or calderas up to 2 klms in diameter, and a vigorous solfataric area at the highly altered volcanic dome structure.

One solfataric area emits a high-temperature (106 degrees C) plume to 30 m height with a roaring noise like a high-pressure geothermal borehole.

As of 8/18/2011 location noted on map is in wrong location and wrong island

Geological Features

Mandalagan is part of the Negros Volcanic Belt.

Rock type is principally andesitic with some dacitic


The most recent eruption produced a thin basaltic lava flow, but it is not known when this is likely to have occurred.


Philippine Institute of Volcanology and Seismology (PHIVOLCS) lists Mandalagan as potentially active.

The Smithsonian Global Volcanism Program lists Mandalagan as fumarolic.

See also

  • Active volcanos in the Philippines
  • Potentially active volcanos in the Philippines
  • Inactive volcanos in the Philippines
  • Philippine Institute of Volcanology and Seismology
    Philippine Institute of Volcanology and Seismology
    The Philippine Institute of Volcanology and Seismology is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes and tsunamis, as well as other specialized information and services primarily for the protection of life and property and in...

  • Volcano
    2. Bedrock3. Conduit 4. Base5. Sill6. Dike7. Layers of ash emitted by the volcano8. Flank| 9. Layers of lava emitted by the volcano10. Throat11. Parasitic cone12. Lava flow13. Vent14. Crater15...

External links

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