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  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 10.882°N
  • 124.888°E

  • 860 m
    2821 ft

  • 272070
  • Latitude
  • Longitude

  • Summit

  • Volcano

The Global Volcanism Program has no activity reports for Mahagnao.

The Global Volcanism Program has no Weekly Reports available for Mahagnao.

The Global Volcanism Program has no Bulletin Reports available for Mahagnao.

Basic Data

Volcano Number

Last Known Eruption



Unknown - Unrest / Holocene

860 m / 2821 ft


Volcano Types


Rock Types

Andesite / Basaltic Andesite

Tectonic Setting

Subduction zone
Continental crust (> 25 km)


Within 5 km
Within 10 km
Within 30 km
Within 100 km

Geological Summary

The forested volcano of Mahagnao in central Leyte Island is also known as Kasiboi or Casiboi. The andesitic volcano contains a steep-walled forested summit crater open to the south. Thermal areas with fumaroles and mud pots occur on the flanks. Two lakes, Malagsom and Danao, are located on the S flank. The former is a crater lake that is acidic and green in color, and the latter is a freshwater lake with an irregular shoreline and hot springs on its southern side. An eruption was reported in 1895, but no details are available.


The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography.

COMVOL, 1981. Catalogue of Philippine volcanoes and solfataric areas. Philippine Comm Volc, 87 p.

Del Mundo E T, Arpa M C, 2007. (pers. comm.).

IAVCEI, 1973-80. Post-Miocene Volcanoes of the World. IAVCEI Data Sheets, Rome: Internatl Assoc Volc Chemistry Earth's Interior..

Neumann van Padang M, 1953. Philippine Islands and Cochin China. Catalog of Active Volcanoes of the World and Solfatara Fields, Rome: IAVCEI, 2: 1-49.

PHIVOLCS, 2004-. Volcanoes.

Eruptive History

Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).

Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
[ 1895 ] [ Unknown ] Uncertain    

This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.


Mahagnaw | Burauen


Feature Name Feature Type Elevation Latitude Longitude
Cone 10° 53' 0" N 124° 53' 0" E


Feature Name Feature Type Elevation Latitude Longitude
Danao, Lake Crater
Malagsom, Lake Crater


Feature Name Feature Type Elevation Latitude Longitude
Thermal 10° 52' 30" N 124° 53' 0" E
To-Od Grande Thermal
To-Od Pequena Thermal

Photo Gallery

The forested volcano of Mahagnao (also known as Kasiboi) in central Leyte Island lies beneath cloud banks at the upper right. The volcano rises to the NE of Ormoc Bay (bottom left) and the city of Ormoc at the head of the bay. The andesitic volcano contains a steep-walled forested summit crater open to the south. Crater lakes and thermal areas with fumaroles and mud pots occur on the flanks of the volcano. An eruption was reported from Mahagnao in 1895, but no details are available.

NASA Landsat image, 1999 (courtesy of Hawaii Synergy Project, Univ. of Hawaii Institute of Geophysics & Planetology).

Smithsonian Sample Collections Database

There are no samples for Mahagnao in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites

Large Eruptions of Mahagnao Information about large Quaternary eruptions (VEI >= 4) is cataloged in the Large Magnitude Explosive Volcanic Eruptions (LaMEVE) database of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
WOVOdat WOVOdat is a database of volcanic unrest; instrumentally and visually recorded changes in seismicity, ground deformation, gas emission, and other parameters from their normal baselines. It is sponsored by the World Organization of Volcano Observatories (WOVO) and presently hosted at the Earth Observatory of Singapore.
EarthChem EarthChem develops and maintains databases, software, and services that support the preservation, discovery, access and analysis of geochemical data, and facilitate their integration with the broad array of other available earth science parameters. EarthChem is operated by a joint team of disciplinary scientists, data scientists, data managers and information technology developers who are part of the NSF-funded data facility Integrated Earth Data Applications (IEDA). IEDA is a collaborative effort of EarthChem and the Marine Geoscience Data System (MGDS).
MODVOLC - HIGP MODIS Thermal Alert System Using infrared satellite Moderate Resolution Imaging Spectroradiometer (MODIS) data, scientists at the Hawai'i Institute of Geophysics and Planetology, University of Hawai'i, developed an automated system called MODVOLC to map thermal hot-spots in near real time. For each MODIS image, the algorithm automatically scans each 1 km pixel within it to check for high-temperature hot-spots. When one is found the date, time, location, and intensity are recorded. MODIS looks at every square km of the Earth every 48 hours, once during the day and once during the night, and the presence of two MODIS sensors in space allows at least four hot-spot observations every two days. Each day updated global maps are compiled to display the locations of all hot spots detected in the previous 24 hours. There is a drop-down list with volcano names which allow users to 'zoom-in' and examine the distribution of hot-spots at a variety of spatial scales.
MIROVA Middle InfraRed Observation of Volcanic Activity (MIROVA) is a near real time volcanic hot-spot detection system based on the analysis of MODIS (Moderate Resolution Imaging Spectroradiometer) data. In particular, MIROVA uses the Middle InfraRed Radiation (MIR), measured over target volcanoes, in order to detect, locate and measure the heat radiation sourced from volcanic activity.