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Ragang volcano rises to 2815 m at the NE end of a series of young volcanic cones SE of Lake Lanao in central Mindanao. A 3-km-long lava flow extends to the SE from the deep summit crater. Ragang is the most frequently active volcano on the large southern Philippines island of Mindanao and is one of several dominantly basaltic volcanoes west of the cordillera in central Mindanao. Historical eruptions, many of which were at one time attributed to neighboring Makaturing volcano, have been recorded since 1765 and consist of moderate explosive activity from the summit crater.
Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).
|Start Date||Stop Date||Eruption Certainty||VEI||Evidence||Activity Area or Unit|
|[ 1916 Jul ]||[ Unknown ]||Uncertain|
|[ 1915 ]||[ Unknown ]||Uncertain||2|
|1873 Jan 16||1873 Apr||Confirmed||2||Historical Observations|
|1871 Dec 8 (in or before)||Unknown||Confirmed||2||Historical Observations|
|1858 Feb 18||Unknown||Confirmed||2||Historical Observations|
|1856 Nov 1||Unknown||Confirmed||2||Historical Observations|
|1840 Jan 20||1840 Apr 5||Confirmed||2||Historical Observations|
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.
|Palao Ragang | Sujut | Pollok | Siyut | Illano | Magasu|
|Ragang volcano (above and to the right of the center of this Space Shuttle image) rises to 2815 m in central Mindanao. Illana Bay lies to the SW at the lower left, and most of Lake Lanao can be seen at the upper left. Ragang is the most frequently active volcano on the large southern Philippines island of Mindanao. Historical eruptions, many of which were at one time attributed to neighboring Makaturing volcano, have been recorded since 1765. Makaturing and Latukan volcanoes are also visible to the SW of Ragang on this image.
NASA Space Shuttle image STS61A-40-71, 1985 (http://eol.jsc.nasa.gov/).
The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.
COMVOL, 1981. Catalogue of Philippine volcanoes and solfataric areas. Philippine Comm Volc, 87 p.
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. http://www.phivolcs.dost.gov.ph/Volcanolist/.
Sajona F G, Bellon H, Maury R C, Pubellier M, Cotten J, Rangin C, 1994. Magmatic response to abrupt changes in geodynamic settings: Pliocene-Quaternary calc-alkaline and Nb-enriched lavas from Mindanao, Philippines. Tectonophysics, 237: 47-72.
Sajona F G, Bellon H, Maury R C, Pubellier M, Querbral R D, Cotten J, Bayon F E, Pagado E, Pematian P, 1997. Tertiary and Quaternary magmatism in Mindanao and Leyte (Philippines): geochronology, geochemistry and tectonic setting. J Asian Earth Sci, 15: 121-153.