Abstract
Mayon Volcano in the Philippines, one the world's most active, is situated in a moist, tropical-maritime climate with frequent typhoons. A third of Mayon's eruptions generate destructive lahars (volcanic debris flows and hyperconcentrated streamflows). Lahars also occur during quiescent periods when monsoons and typhoons deliver rains of appropriate intensity and duration to the loose debris on the volcano slopes. Both eruption- and post-eruptive lahars occur most frequently during the typhoon-prone October–December season of the Northeast Monsoon. Post-eruptive lahars, the most poorly documented, are exemplified by a debris-flow event triggered by Saling, a typhoon of only moderate intensity, that occurred in Mabinit Channel on the southeast Mayon flank on October 17–18, 1985, one year after the last Mayon eruption.
Detailed pre- and post-Saling surveys docment channel deepening of up to 4 m and maximum lateral erosion of 66 m. The debris flows left prominent, discontinuous multi-level terraces along the length of Mabinit Channel, either from pulsations due to temporary channel blockage, or as levee deposits. A significant volume of debris overtopped channel bends at 250–200 m elevations, coalescing to cover a 200,000 m2 area of 4.5° slope with bouldery lateral deposits 1 m thick on the average. Channelized flows below this level plugged 0.5 km of the original channel and replaced it with a new conduit of comparable size.
The Saling debris-flow deposits have a remarkably uniform sand-silt mode and less prominent, more variable modes in the pebble-boulder range. Shear strengths of the lateral flows ranged from 0.46×104 to 2.32×104 dn cm−2; those of the channelized flows at the plug were significantly higher. Reconstructed flow velocity was 3.8 m sec−1.
Résumé
Le volcan Mayon, localisé aux Philippines est l'un des plus actifs du monde, est situé dans un climat humide, tropical-matritime. Un tiers des éruptions du Mayon produit des lahars destructifs (coulées de débris volcaniques à très forte charge solide). Des Lahars sont générés aussi pendant des périodes tranquilles quand la mousson et les typhons donnent des pluies dont l'intensité et la durée sont suffisantes pour entraîner les débris meubles sur les pentes du volcan. En général, les lahars d'éruption et post-éruptifs du Mayon sont produits entre octobre et décembre, la saison de la mousson du nord-est, quand les typhons sont les plus fréquents. Un exemple de ces lahars post-éruptifs (les moins bien connus), a été provoqué par Saling, un typhon d'intensité moyenne dans le Mabinit Channel sur la pente sud-est du Mayon les 17 et 18 octobre, 1985, un an après la dernière éruption du Mayon.
Las surveillance detaillée du chenal avant et après Saling a montré un approfondissement atteignant 4 m et une érosion maximale de 66 m. Les coulées ont laissé des terrasses étagées discontinues le long du Mabinit Channel, causées soit par des pulsations dues au blocage temporaire du chenal soit par dépôt latéral. Un volume important de débris couvrait une surface de 20 hectares avec une pente de 4.5° avec un dépôt latéral, épais d'environ 1 m. Les coulées en-dessous de ce niveau, colmataient le chenla d'origine sur 0,5 km et remplaçaient ce dernier par un nouveau chenal de taille comparable.
Les dépôt des lahars dus au typhon Saling présentent un mode dans les sables-limons remarquablement uniforme, et au contraire plus varié au niveau des cailloux. La résistance au cisaillement du dépôt latéral est de 0,46×104 à 2,32×104 dn cm−2, est nettement plus élevée pour le matériau qui remplit le chenal. La vitesse des coulées a été estimée à 3,8 m sec−1.
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Rodolfo, K.S., Arguden, A.T., Solidum, R.U. et al. Anatomy and behaviour of a post-eruptive rain lahar triggered by a typhoon on Mayon volcano, Philippines. Bulletin of the International Association of Engineering Geology 40, 55–66 (1989). https://doi.org/10.1007/BF02590341
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DOI: https://doi.org/10.1007/BF02590341