Journal of the Japan Society of Erosion Control Engineering,
Vol.57,No.1,p.27-32,2004
A slope failure analysis of the921Chi]Chi earthquake in Taiwan using remote sensing images
Shinya NUMAMOTO, Setsuo HAYASHI, Kanji KONDO, Kimiaki NAKANO, Hiroshi KAWABE
Abstract
Serious damage concerning to the human life and artificial structure in central Taiwan according to the 921 Chi]Chi earthquake (M7.3) occurred near Chi]Chi on September 21, 1999. This earthquake caused uplift of active surface fault, and occurrence of many slope failures in the steep mountainous area. The number and area of slope failures were surveyed just after the earthquake by Taiwan Agricultural Committee. The purpose of this study is estimating the total area of newer slope failures caused by 921 Chi]Chi earthquake origin, except for the former existing slope failures. To distinguish between former existing bareland and newly occurred slope failures, the SPOT/HRV satellite images just before and after the earthquake were analyzed using the method of simple orthophotography. The result obtained from this method yields lesser value compared with the actuality because of being limited by the minimum resolution (20m square) of SPOT/HRV satellite images. As the result, the area of the slope failures triggered by 921Chi]Chi earthquake are 2.1%(in north area) and 4.3% (in south area).
Key words:921Chi]chi earthquake, slope failure, remote sensing image
Japan Society of Erosion Control Engineering
Sabo Kaikan, 2-7-5 Hirakawa-cho, Chiyoda-ku,
Phone +81-3-3222-0747 Fax +81-3-3230-6759
http://www.jsece.or.jp/
Mail jimu@jsece.or.jp