雲仙普賢岳の噴火から火砕流発生までの行政の防災対策と情報伝達

概要

論文の詳細を見る
Eruption of Mt. Unzen recurred on November 17,1990,after 198 years of silence. At first, the attention of the local governments was poured to the danger of repetition of Mt. Mayuyama Landslide (1792). However, continuous volanic activity at Fugendake peak caused a great piling-up of volcanic ash at the headwaters of the Mizunashi River, which stimulated seven debris flows between May 15 and June 3,1991. Inhabitants were advised to evacuate and no injuries were reported in this period, although a pyroclastic flow occurred on Jaue 3 and killed 43 people. Pyroclastic flows were repeated many times there after, and the local governments forced the inhabitants to evacuate from delineated dangerous area. The present paper describes the policy taken by the governments of Nagasaki Prefecture and Shimabara City against the risk of large-scale landslides, pyroclastic flows and debris flows. Establishment of prediction and warning system and other types of risk management is also reported. Finally several proposals of the authors are shown.
日本自然災害学会の論文
1992-08-31