台湾中部の地震により繰り返し発生する雲林県草嶺の大規模崩壊

概要

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The large-scale landslide of about 1.2× 108 m3 in volume of the sliding soil occurred in Tsaoling, Central Taiwan, due to the Chi-Chi Earthquake on Sep. 21, 1999. On this slope, landslides have been repeated five times - three times by earthquakes and two times by heavy rains - as far as known on the same slope from 1862 to 1999. It is deduced that this repetitiousness of landslides is not only controlled by the repetitiousness of triggers, e.g. earthquakes and heavy rains, but also by the following phenomena repeated after every landslide: 1) dilatation and deterioration of base rock by stress release, 2) looseness of base rock by creep, and 3) crystallization pressure or hydration pressure of salts in supersaturated ground water.
歴史地震研究会の論文