潜在溶岩円頂丘とは, 特に有珠火山に関連して(特集：2000年有珠山噴火)

• 横山 泉

書誌事項

タイトル別名

• The Formation of Cryptodomes; Usu Volcano, Hokkaido, Japan(Special Section：The 2000 Eruption of Usu Volcano)
• 潜在溶岩円頂丘とは、特に有珠火山に関連して
• センザイ ヨウガン エンチョウキュウ トワ トクニ ウス カザン ニ カンレン シテ

抄録

A familiar feature of Usu volcano, Hokkaido, is more than ten domes located on and around the volcano. The four domes formed in historical times are dacitic in composition. Ko-Usu, Oo-Usu and the 1944 Showa-shinzan dome are all clearly extrusive lava domes. In contrast, the 1910 Meiji-shinzan dome has been previously thought to be an intrusive cryptodome. Definitions of cryptodomes in recent textbooks define them in terms of shallow, subsurface intrusion of lava, which may or may not be related to surface upheaval. The presence of such features has rarely been confirmed by geophysics. In fact, volcanic domes reflect a huge range of structures and formation processes, and have not been satisfactorily defined worldwide. The 1944 eruption of Usu volcano and growth of the dome were monitored using standard geophysical techniques. In the present paper, pseudo growth curves for the development of the dome have been derived from precise leveling measurements traversing the eastern base of the dome. In the early stages, the surface was raised some 65 m into a conical mound by intrusion of viscous magma from a depth of approx. 100 m. This event was the formation of a cryptodome, which eventually ruptured, forming the 1944 lava dome.

収録刊行物

• 火山

  火山 47 (3), 151-160, 2002

  特定非営利活動法人 日本火山学会

詳細情報

• CRID: 1390001204304983936
• NII論文ID: 110003041249
• NII書誌ID: AN10512786
• DOI: 10.18940/kazan.47.3_151
• ISSN: 21897182
• ISSN: 04534360
• NDL書誌ID: 6214100
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I6214100
• 本文言語コード: ja
• データソース種別:
  • JaLC
  • NDL
  • CiNii Articles
• 抄録ライセンスフラグ: 使用不可