NDLI: Catastrophic rockslide-debris avalanche at St. Bernard, Southern Leyte, Philippines

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The first general assembly and the fourth session of the Board of Representatives of the International Consortium on Landslides on 12–14 October 2005 in Washington, DC, USA

Landslides : Volume 3

Landslides : Volume 2

Landslides : Volume 1

Catastrophic rockslide-debris avalanche at St. Bernard, Southern Leyte, Philippines

Content Provider	Springer Nature Link
Author	Catane, Sandra G. Cabria, Hillel B. Tomarong, Cristituto P. Saturay, Ricarido M. Zarco, Mark Albert H. Pioquinto, Winston C.
Copyright Year	2006
Abstract	On 17 February 2006, a rockslide-debris avalanche cascaded down the steep slope of Mt. Can-abag, burying the entire village of Guinsaugon in St. Bernard, Southern Leyte, Philippines. Casualties include 139 dead with 980 still missing and presumed dead, making it perhaps the most catastrophic landslide in Philippine history. The landslide started at the ridge top along a fault plane associated with the active Philippine Fault Zone. It started as a block slide that transformed into an avalanche. The entire event lasted for only a few minutes. Estimated maximum landslide velocity is 120–130 m/s. The landslide left behind a deep, wedge-shaped scarp. The central part of the deposit exhibits a hummocky topography typical of avalanches, in contrast to the flatter surface of the debris-flow-type marginal deposit. High amounts of soil in the matrix were derived from the scouring of ancient landslide deposits and rice fields in the valley. The landslide has a total area of 3.2 km2 and a runout distance of 4.1 km. Estimated volume of debris is approximately 20 Mm3. At least four streams were dammed by the landslide debris. Intense precipitation and earthquakes preceding the landslide are the potential triggers. Preliminary back analyses assuming a planar and wedge slip surface yielded very low factors of safety even under dry conditions. A more rigorous analysis of the failure mechanism of the landslide is needed.
Starting Page	85
Ending Page	90
Page Count	6
File Format	PDF
ISSN	1612510X
Journal	Landslides
Volume Number	4
Issue Number	1
e-ISSN	16125118
Language	English
Publisher	Springer-Verlag
Publisher Date	2006-10-17
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Landslide Debris avalanche Slope stability Guinsaugon Philippines Civil Engineering Agriculture Geography (general) Applied Geosciences
Content Type	Text
Resource Type	Article
Subject	Geotechnical Engineering and Engineering Geology

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