台風7709号による沖永良部島の被害について

Abstract

By the typhoon of September 9, 1977, Okinoerabu Island has suffered with the severe damages.The maximum wind speed of 39.4 m/sec, the peak gust of 60.4 m/sec and the minimum barometricpressure of 907.3 mb were observed there. The structural damages caused by the typhoon wereexplored. The distinct feature of the damages was that many roofs slated with galvanized ironsheets of wooden houses were blown off. The damaged ratio of the completely destroyed houses tothe total houses was up to 24 percents, which was very high compared with the ratio of other severetyphoon damages in Japan.The record of the maximum peak gust was not obtained as the anemoneter was broken whenthe peak gust showed just 60.4 m/sec. The maximum peak gust was estimated to be about 80 m/secby investigating the damages on glass panes and the failures of steel poles.