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Gravity basement of the Guinsaugon landslide along the Philippine Fault Zone
Earth, Planets and Space volume 59, pages 1067–1071 (2007)
Abstract
A gravity survey was conducted in Guinsaugon, St. Bernard, Southern Leyte, Philippines, to determine the subsurface structure of the Leyte segment of the Philippine Fault Zone (PFZ), where a massive landslide killed 1119 villagers on 17 February 2006. The landslide started on top of a 780-m-high ridge linked with the PFZ. The build-up of pore pressure in the slope due to saturation and possible earthquake-triggered ground shaking along the PFZ, may have initiated the landslide. A two-dimensional structure using homogeneous density models was applied to interpret the gravity anomalies in the Guinsaugon landslide. The most suitable model depicts a deep, narrow graben filled with low-density sediments. The graben is 1.5 km wide and 2 km deep and has a density contrast of -0.4 g/cm3. The western boundary of the graben is steep and coincides with the terminus (southern) Leyte segment of the PFZ. The existence of a deep-seated seismically active fault at the foot of the steep slopes and the soft sediments in the narrow graben are important factors in understanding the trigger and failure mechanisms of the landslide and in the assessment of hazards and risks due to landslides and earthquakes.
References
Bautista, M. L. P. and K. Oike, Estimation of the magnitudes and epicenters of Philippine historical earthquakes, Tectonophysics, 317, 137–169, 2000.
Besana, G. M. and M. Ando, The central Philippine Fault Zone: location of great earthquakes, slow events, and creep activity, Earth Planets Space, 57, 987–994, 2005.
Besana, G. M., J. A. Daligdig, N. M. Tungol, M. I. T. Abigania, B. Santos, B. J. T. Punongbayan, H. Penarubia, R. R. Maximo, L. Torrevillas, R. Dela Cruz, K. I. Papiona, and R. Lumbang, The Final Report of the 2003 Masbate Quake, PHIVOLCS Open File Report, pp. 1–30, 2003.
Catane, S. G., H. B. Cabria, C. P. Jr. Tomarong, R. M. Jr. Saturay, M. A. H. Zarco, and W. C. Pioquinto, Catastrophic rockslide-debris avalanche at St. Bernard, Southern Leyte, Philippines, Landslides, SpringerLink, doi:10.1007/s10346-006-0050-3, 2006.
Cole, J., R. McCabe, T. Moriarty, J. A. Malicse, F. G. Delfin, H. Tebar, and H. P. Ferrer, A preliminary Neogene paleomagnetic data set from Leyte and its relation to motion on the Philippine Fault, Tectonophysics, 168, 205–221, 1989.
Daag, A. S., O. Molina, D. Buena, and E. Gumabon, Deterministic modeling of rain- and earthquake-induced landslides in mountainous environments transected by an active fault, presented at Caravan Seminar on Geospatial Technologies for Disaster Mitigation: Philippines Perspective, Philippine Institute of Volcanology and Seismology, Makati City, Philippines, 27 November 2006, 2006.
Domasig, W. F., Report on the ground investigation of reported landslides and ground fissures and other earthquake-related damages in Cabalian—St. Bernard area in Southern Leyte, memorandum report, 6 p., Mines & Geosciences Development Service, 1991.
Duquesnoy, T. H., Contribution de la geodesie a l’etude de grands decrochements actifs associes a des zones de subduction a convergence oblique, These de doceur en science, University of Paris-XI, Orsay, 1997.
Duquesnoy, T. H., E. Barrier, M. Kasser, M. Aurelio, R. Gaulon, R. S. Punongbayan, C. Rangin and the French-Philippine Cooperation Team, Detection of creep along the Philippine Fault: first results of geodetic measurements on Leyte island, central Philippines, Geophys. Res. Lett., 21(11), 975–978, 1994.
Endo, H., S. Watanabe, M. Makino, Y. Murata, K. Watanabe, and A. Urabe, Damage caused by the 1995 Hyogoken-Nanbu Earthquake and concealed faults in the Hanshin area, Hyogo Pref. Japan, Quat. Res., 35, 165–178, 1996.
Ferguson, J. F., R. N. Felch, C. L. V. Aiken, J. S. Oldow, and H. Dockery, Models of the Bouguer gravity and geologic structure at Yucca Flat, Nevada, Geophysics, 53, 231–244, 1988.
GSJ Gravity Survey Group, On the standard procedure SPECG1988 for evaluating the correction of gravity at the Geological Survey of Japan, Bull. Geol. Surv. Jpn., 40, 601–611, 1989 (in Japanese with English abstract).
JICA-MMAJ, The mineral exploration—mineral deposits and tectonics of two contrasting geologic environments in the Republic of the Philippines, Consolidated report on Leyte, Dinagat and Surigao areas, Japan International Cooperation Agency-Metal Ming Agency of Japan, Japan, 1990.
Komazawa, M., Gravimetric analysis of Aso Volcano and its interpretation, J. Geodetic Soc. Jpn., 41, 17–45, 1995.
Lanuza, A. G., A. V. Chu, E. A. Mangao, D. S. Soneja, R. Sanez, and D. C. Garcia, Aftershocks observation of 05 July 1994 earthquake in Cabalian area, Southern Leyte, PHIVOLCS internal report, 35 p., Philippine Institute of Volcanology and Seismology, 1994.
Litinsky, V. A., Concept of effective density: key to gravity depth determinations for sedimentary basin, Geophysics, 54, 1474–1482, 1989.
Lukandu, A. I., S. Okuyama, and S. Takemoto, Gravity inversion modeling across fault/tectonic lines in the Central Ranges in Honshu, Japan, J. Geol. Soc. Jpn., 49, 73–82, 2003.
Makino, M., An improved method for two-dimensional gravity analysis by using logarithmic functions: an application to the Kobe area, Butsuri-Tansa, 50, 123–131, 1997 (in Japanese with English abstract).
Makino, M. and H. Endo, Gravity survey around the area of the Harihara-gawa debris flow at Izumi, Kagoshima Prefecture, Butsuri-Tansa, 52, 153–160, 1999 (in Japanese with English abstract).
Murata, Y., Y. Suda, and T. Kikuchi, Rock physical properties of Japan—density, magnetism, P-wave velocity, porosity, thermal conductivity, Open File Report 276, 302 p., Geological Survey of Japan, 1991 (in Japanese).
PAGASA, Rainfall data from Otikon, Libagon, Southern Leyte, Philippine Atmospheric Geophysical and Astronomical Services Agency (PA-GASA), Philippines, 2006.
Suda, Y., Y. Murata, T. Kikuchi, and N. Hanaoka, Physical properties database of rocks (PROCK), Open File Report 155, 231 p., Geological Survey of Japan, 1991 (in Japanese).
Suwa, H., Catastrophe by the 17 February 2006 Southern Leyte landslide in Phillipine, J. Jpn. Soc. Natural Disaster Sci., 25, 83–97, 2006 (in Japanese with English abstract).
Talwani, M., J. L. Worzel, and M. Landisman, Rapid gravity computations for two-dimensional bodies with application to the Mendocino submarine fracture zone, J. Geophys. Res., 64, 49–59, 1959.
Williams, H. A., J. Cassidy, C. A. Locke, and K. B. Sporli, Delineation of a large ultramafic massif embedded within a major SW Pacific suture using gravity methods, Tectonophysics, 424, 119–133, 2006.
Yokoyama, I. and S. Ohkawa, The subsurface structure of the Aira Caldera and its vicinity in the southern Kyushu, Japan, J. Volcanol. Geotherm. Res., 30, 253–282, 1986.
Zarco, M. A. H., S. G. Catane, H. B. Cabria, R. M. Saturay, Jr., and A. S. Mirasol-Robert, Failure mechanism of a massive landslide: analysis of the 17 February 2006 Guinsaugon rockslide-debris avalanche, Philippines, Proceedings of the 4th Civil Engineering Conference in the Asian Region, Taipei, Taiwan, June 26-28, 2007.
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Makino, M., Mandanas, A.A. & Catane, S.G. Gravity basement of the Guinsaugon landslide along the Philippine Fault Zone. Earth Planet Sp 59, 1067–1071 (2007). https://doi.org/10.1186/BF03352049
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DOI: https://doi.org/10.1186/BF03352049