フィリピン・レイテ島で2006年2月17日に起きた地すべり災害

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The Barangay Guinsaugon, in a municipality of St. Bernard in Southern Leyte Province, Philippine was buried by a debris avalanche, which was triggered by the 17 February 2006 landslide. The main feature of the landslide is a gigantic rockslide. The hazard claimed 154 victims and 990 missing including 246 school children. The debris avalanche buried residential area and the paddy fields of totally 2.0×10^6m^2. Heavy rainfall before the slide including the rainfall of 751mm in the early half of February, that is equivalent to three times of the mean rainfall amount for this period in the year, must have played a major role of the ultimate instability of the slope. The Philippine Atmospheric, Geophysical and Astronomical Services Administration (PAGASA) announced that rainstorm activity was very high due to the meteorological condition of La Nina and called the attention of people to rainstorm hazards prior to this landslide. Although the local residents noticed occurrence of crack on the slopes, tilting of trees on the slopes, small landslides and dry out of stream water in a small river flowing just beside the Guinsaugon, they havent recognized them as the precursory phenomena that should connect to the significant hazards. The landslide was accompanied with a small earthquake of surface-wave magnitude ms 2.6 whose epicenter was determined 23km westwards from the landslide slope by a seismograph network. It is not clarified so far either this earthquake played a role of the final trigger for the landslide or the landslide generated this ground tremor.
2006-05-31

フィリピン・レイテ島で2006年2月17日に起きた地すべり災害

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