Assessment of potential slope failure sites at Mt. Can-abag, Guinsaugon, Philippines, based on stratigraphy and rock strength

Futalan, Krestabelle M.; Biscaro, John Ronald D.; Saturay, Ricarido M.; Catane, Sandra G.; Amora, Melezra; Villaflor, Emmanuelle L.

doi:10.1007/s10064-009-0253-7

Cited by 13 publications

(11 citation statements)

References 5 publications

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“…Plane pole density plot; N=8; Mean orientation N34W 23SW; Mean resultant length=0.98. Data from this study,Catane et al (2008), andFutalan et al (2010).…”

supporting

confidence: 51%

“…Consequent to this designation, the near-vertical, southeast-dipping slope (SP1 in Catane et al, 2008) bounding the major sliding plane to the north may be interpreted as the corresponding antithetic riedel shear, as shown in (Guthrie et al, 2009). A stereonet plot of 74 joint and fault readings within the landslide area shows predominant discontinuities steeply dipping to the northeast (Futalan et al, 2010).…”

Section: The Philippine Fault Zone Passes Through the Narrow Linear mentioning

confidence: 96%

“…A Late Pliocene age is determined from nannofossil content (MMAJ-JICA, 1990). This unit is referred to as the source lithology of the Guinsaugon landslide composed of a thick sequence of southwest-dipping beds of sandstones, breccias and mudstones (Catane et al, 2008;Futalan et al, 2010).…”

Section: Late Pliocene Dolores Formationmentioning

confidence: 99%

“…It has a basal conglomerate, and a repeating sequence of poorly consolidated sand- (Catane et al, 2008;Futalan et al, 2010). While there were general descriptions of the beds of the Pangasugan and Dolores Formations (MMAJ-JICA, 1990;MGB, 2010), it is not clear whether those measurements were taken within the study area.…”

Section: Middle Miocene To Pliocene "Tertiary Clastics Of Cabac"mentioning

confidence: 99%

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Rock mass strength as link between geology and topography in the Can-abag mountain range, Southern Leyte, Philippines

Saturay¹

2019

Preprint

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Rock mass strength is used to characterize the influence of geology on the topography of the Can-abag mountain range in Southern Leyte, Philippines. A geologic model comprised of Jurassic to Cretaceous ultramafic rocks (UM), pre-Miocene fine clastic rocks (FC1), Middle Miocene limestones (LS1), Late Miocene to Late Pliocene coarse clastic rocks (CC), Late Miocene to Early Pliocene fine clastic rocks (FC2), and Late Pliocene limestones (LS2) is proposed for the study area. Five litho-structural units are derived from this model for use in the succeeding discussion: coarse clastic rocks west and east of the Can-abag ridge (CCw, CCe), fine clastic rocks (FC), limestones (LS) and ultramafic rocks (UM). FC and UM, both having weak rock mass strengths, are prone to isotropic slope failures, and are characterized by low-gradient, low curvature terrain. LS has high rock mass strengths, but because of limited topographic relief development, exhibits low-gradient, low curvature terrain similar to the weak rock masses. CCw and CCe both have high rock mass strengths and are characterized by high gradient, high curvature terrain. The former has slightly lower gradient and higher curvature than the latter due to the dominance of channelized transport processes. The latter, on the other hand, is influenced by steeply-dipping planar discontinuities which facilitate episodic massive landslides, which in turn reduce the curvature of the underlying unit. The weak rock mass strength of FC is mainly due to the inherent weakness of the fine-grained intact rock. In contrast, UM, which has high intact rock strengths due to the crystalline texture, is reduced to a weak rock mass by numerous discontinuities attributed to the long history of tectonic deformation. CCw and CCe, while having low intact rock strengths just above that of FC, have higher rock mass strengths because of good discontinuity conditions. LS has high rock mass strengths because of high intact rock strengths and good discontinuity conditions. Regional geologic structures such as bedding and fault planes provide potential conditions for planar slope failures within the rock masses. However, failures are spatially limited by the geometric relationships between the geologic structures and the existing topography. Steeply-dipping structures have direct significant contributions to massive landslides in terrains underlain by materials with strong isotropic rock mass strengths, such as in CCe. The geologic environment – lithology, structures, stratigraphy, tectonic history – provides the material base on which surface processes act on to create the present landform. Rock mass strength, as a geomechanical manifestation of the geologic environment and as a physically-based and quantifiable concept, provided a good framework for understanding and explaining the spatial variability of topographic characteristics in relation to the geologic materials of the Can-abag mountain range in Southern Leyte, Philippines. Some remarks regarding the use of gradient distributions in rock mass strength characterization, the use of slope gradient in landslide susceptibility analysis, and frequency-magnitude of landslides are put forward.

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“…Plane pole density plot; N=8; Mean orientation N34W 23SW; Mean resultant length=0.98. Data from this study,Catane et al (2008), andFutalan et al (2010).…”

supporting

confidence: 51%

Section: The Philippine Fault Zone Passes Through the Narrow Linear mentioning

confidence: 96%

Section: Late Pliocene Dolores Formationmentioning

confidence: 99%

Section: Middle Miocene To Pliocene "Tertiary Clastics Of Cabac"mentioning

confidence: 99%

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Rock mass strength as link between geology and topography in the Can-abag mountain range, Southern Leyte, Philippines

Saturay¹

2019

Preprint

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“…The adverse tectonic conditions and weak rock mass structures are the major factors for their occurrence (Dai et al 2005;Weidinger 2006;Huang 2009;Futalan et al 2010;Youssef et al 2012;Papadopoulou et al 2013). Since then, subsequent events, such as crustal movement, erosion and weathering tend to promote downslope movement.…”

Section: Introductionmentioning

confidence: 99%

Reactivation mechanism of ancient giant landslides in the tectonically active zone: a case study in Southwest China

et al. 2015

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The reactivation mechanism and stability of ancient landslides are the major concerns in the tectonically active zone. A detailed case study has been conducted to examine the reactivation mechanism of ancient landslides in Southwest China by investigating the reactivation process, shear strength and stability. Field investigation suggests that the reactivation of ancient giant slides, such as the Luosiwan slide, is attributed to the cumulative effect of adverse geological, structural condition and intensive artificial processes. However, long-term observation has shown that the ancient giant landslides usually remain stable in the remote area in spite of such adverse conditions. Ring shear tests also indicate high peak shear strength of the sliding zone soils. However, the shear strength decreases significantly once displacement occurs at the toe of giant landslide due to engineering construction. The construction process could be considered as the critical triggering factor for the reactivation of ancient giant landslide, which exerts sudden changes in the forces acting on the slope. Both longterm adverse geological evolution and sudden change in the strength lead to the reactivation of giant landslide. This study also suggests that liquefaction plays an important role in the failure behavior of reactivated ancient landslide. An effective drainage system has to be set up during engineering construction so as to reduce the probability of reactivation of ancient landslides.

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A new geological model for Spriana landslide

Longoni

Papini

Arosio

et al. 2014

Bull Eng Geol Environ

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Complex large landslides are characterized by different kinematic behaviors and involve diverse materials. Both elements make it difficult to study the instability of these huge mass movements, which may cause massive damage and affect extended areas. This paper is focused on the study of Spriana landslide, an important rockslide located in the North of Italy. Starting from the geological interpretation provided by Belloni and Gandolfo (Geologia tecnica ed ambientale 3:7–36, 1997), the authors gather all available data sets and perform a novel analysis aimed to better describe the unstable body. The key point of this case study regards the characterization of the deeper surface of failure. The location as well as the continuity of this surface is a crucial unsolved question, and in this paper we try to provide a reasonable answer. We propose a new hypothesis based on a structurally controlled, wedge-like rockslide involving the presence of a composed deeper surface of failure constrained by the intersection of two different weak zones. Although this work mainly addresses the development of a new geological model, numerical simulations were also performed. Both continuous and discontinuous models were tested, and then a comparison of the outcomes of the numerical simulations was performed to define the best fit to the observed landslide behavior

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Assessment of potential slope failure sites at Mt. Can-abag, Guinsaugon, Philippines, based on stratigraphy and rock strength

Cited by 13 publications

References 5 publications

Rock mass strength as link between geology and topography in the Can-abag mountain range, Southern Leyte, Philippines

Rock mass strength as link between geology and topography in the Can-abag mountain range, Southern Leyte, Philippines

Reactivation mechanism of ancient giant landslides in the tectonically active zone: a case study in Southwest China

A new geological model for Spriana landslide

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