제사기(第四紀) 화산암(火山岩) 분포지역(分布地域)에 빈발(頻發)하는 지질재해(地質災害)에 관(關)하여

A Geologic Disasters in Quaternary Volcanic Area, Ulreung-Island

A geologic disasters in Ulreung-island is forming along the slope of pyroclastic, deposits and this paper discusses soil mechanics and properties and morphologies of pyroclastic soil. The typers of degradation are determined by cutting the soil and classified genetically. Finally, the range of stability is deduced from dip of slope (${\alpha}$) and lengh of slope (l) as the following;.