Observation of Eruption Disaster

Eruption of Mt.Fugendake, Unzen

Eruption of Mt.Fugendake, Unzen79KB
Let me introduce an image showing the eruption of Mt.Fugendake, Unzen in Shimabara Peninsula, Nagasaki prefecture, observed by Earth Observation Satellite, SPOT-2 of French CNES (Center National d'Etudes Spatiales) at 11:00 a.m. October 2, 1991.
It shows that the pyroclastic flow hit over the north-eastern slope of Mt.Fugendake on September 15, ran along Oshigadani Valley and reached the main stream of Mizunashi River through Kitakamikoba area, after joining the flow formed before. In addition, it shows that the heat wind containing volcanic ashes crossed over Mizunashi River, causing devastating damage to the Ohno-Koba area.
Eruption of Mt.Fugendake, Unzen image-1 88KB

Eruption of Mt.Fugendake, Unzen image-2 63KB

Eruption of Mt.Fugendake, Unzen image-3 103KB

Eruption of Mt.Fugendake, Unzen image-4 86KB

Eruption of Mt.Fugendake, Unzen image-5 65KB

French Earth Observation Satellite,(SPOT) observed the change around Mt.Fugendake, Unzen, Nagasaki prefecture at the altitude of 830 km.
Image-1 shows the greenery mountain area before the eruption, image-2,the outbreak of enormous pyroclastic flows on 3rd and 8th of June, and the trace of the pyroclastic flows and avalanches of earth and rocks two months after the avalanches of earth and rocks in Mizunashi River on June 30.
In image-3, it is observed that huge pyroclastic flows broke out on September 15 ran down the Oshigadani valley, reaching Ohnokoba area.
In image-4 aquired seven months after that, the pyroclastic flow has extensively spread over the area, showing the extent of the volcanic activities.
In image-5 observed two years after the first pyroclastic outbreak, it is observed that not only most of the eastern side of Mt.Fugendake has shown signs of the pyroclastic flow, but it has reached as far as Senbongi area in the northwest after striking over Tarugi Hights.