空中写真を用いた有珠火山西麓2000年火口周辺の山体変動解析(<特集>2000年有珠山噴火)

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Airphotograph analysis was carried out on the west slope of Usu volcano. Hokkaido, Japan during the eruption, which was started on March 31, 2000. The set of four stages airphotographs which were taken between August 1993 and May 2000 were used for analysis. The comparison of the airphotographs which were taken on August 22, 1993 and April 3, 2000 showed the deformation caused by the deeper expansion source around 1.1 km below the sea level on the southwest foot of Konpira-yama. The maximum horizontal and vertical movement vectors were 10 meters and 19 meters respectively. The comparison of the airphotographs which were taken on April 3 and April 26, 2000 showed the deformation caused by the shallower expansion source around 0.3 km below the sea level on the northwest foot of Nishi-yama. The maximum horizontal and vertical movement vectors were 15 meters and 25 meters respectively. No large movement was detected after the April 26. The total maximum horizontal and vertical movement vector between August 1993 and May 25, 2000 were 24 meters and 40 meters, respectively. There was no direct evidence which indicated the shallow magma intrusion during the activity, especially as to showing the magmatic temperature. So the shallower expansion source during the April 2000 activity was not caused by the possible shallow magma intrusion. The up welling solid rock block might occur, which was formed by the group of earthquakes before the eruption, and it induced the surface deformation.
特定非営利活動法人日本火山学会の論文
2002-07-10

空中写真を用いた有珠火山西麓2000年火口周辺の山体変動解析(<特集>2000年有珠山噴火)

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