Abstract
Geological mapping was undertaken to determine the stratigraphy and potential landslide sites along Mt. Can-abag in St. Bernard, Philippines, where a disastrous landslide occurred in February 2006. The area is underlain by a sequence of NW- to SW-dipping breccias, sandstones and mudstones, with andesite intrusions. The low permeability of the mudstones, which form an aquiclude and hence confined aquifers, results in the build-up of pore pressures. Although the strata dip into the hillside, the fault-created discontinuities mean that the NE-facing slope of Mt. Can-abag is prone to wedge failures.
Résumé
Une cartographie géologique a été réalisée pour définir la stratigraphie et identifier les sites de glissements potentiels le long des Mt Can-abag à Saint-Bernard (Philippines) où un glissement désastreux s’est déclenché en février 2006. La région est constituée par une séquence de brèches, de grès et d’argilites de pendages orientés de nord-ouest à sud-ouest, avec des intrusions andésitiques. La faible perméabilité des argilites, qui forment un aquiclude à l’origine de nappes captives, a pour conséquence l’établissement de fortes pressions interstitielles dans les terrains. Le long des pentes du Mt Can-abag orientées vers le nord-est, le pendage de la série étant donc contraire à la pente des terrains, les discontinuités créées par des failles sont à l’origine de ruptures en coin.
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Futalan, K.M., Biscaro, J.R.D., Saturay, R.M. et al. Assessment of potential slope failure sites at Mt. Can-abag, Guinsaugon, Philippines, based on stratigraphy and rock strength. Bull Eng Geol Environ 69, 517–521 (2010). https://doi.org/10.1007/s10064-009-0253-7
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DOI: https://doi.org/10.1007/s10064-009-0253-7