The 17 February 2006 rock slide-debris avalanche at Guinsaugon Philippines: a synthesis

被引:43
作者
Guthrie, Richard H. [1 ]
Evans, Stephen G. [1 ]
Catane, Sandra G. [2 ]
Zarco, Mark A. H. [3 ]
Saturay, Ricarido M., Jr. [2 ]
机构
[1] Univ Waterloo, Dept Earth Sci, Landslide Res Program, Waterloo, ON N2L 3G1, Canada
[2] Univ Philippines, Coll Sci, Natl Inst Geol Sci, Quezon City 1101, Philippines
[3] Univ Philippines, Coll Engn, Inst Civil Engn, Quezon City 1101, Philippines
基金
加拿大自然科学与工程研究理事会;
关键词
Landslide disaster; Philippines; Time to failure; Rockslide-debris avalanche; Landslide trigger; Landslide risk; SOUTHERN LEYTE; FAULT ZONE; LANDSLIDE; EARTHQUAKES; MECHANISM; FAILURE; ISLAND; MODEL;
D O I
10.1007/s10064-009-0205-2
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
The paper presents a synthesis of the key findings of the conference and workshop convened to consider the causes of and lessons to be learned from the disastrous rockslide-debris avalanche on 17 February 2006 in southern Leyte, Philippines. Some 1,221 people died and the barangay of Guinsagon was buried. The geology, historical seismicity, progressive disintegration of the rock mass, development of smectite layers and the continuous development and movement of shears within the Philippine Fault Zone combine in the steep rugged terrain to produce massive landslides, of which the 15 million m(3) Guinsaugon event was the latest. The relevance of recent heavy rain and an almost synchronous seismic event are considered but it is concluded that the movement was the result of progressive failures and tectonic weakening while the landslide hazard was increased by the presence of rice paddy fields in the valley bottom. An anecdotal time to failure curve is presented, based on eyewitness accounts and observations of instability. Attention is drawn to the importance of both the education and training of the local people in the recognition of signs of potential movement and a reporting management system. Such simple measures could save lives and empower local communities to take some ownership of their level of landslide risk.
引用
收藏
页码:201 / 213
页数:13
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