Structural development of shallow conduit of explosive eruption

2014 Fiscal Year Final Research Report

• Project/Area Number: 24510251
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Natural disaster science
• Research Institution: National Institute of Advanced Industrial Science and Technology
• Principal Investigator: GESHI Nobuo 独立行政法人産業技術総合研究所, 活断層・火山研究部門, 主任研究員 (70356955)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 火山 / 噴火 / マグマ

Outline of Final Research Achievements

More than 20 conduit structures are recognized in the summit crater of Miyakejima Japan. They can be grouped into three categories; effusive conduit, moderate-explosive conduit and strongly-explosive conduit based on their structure and associated products. The spectrum of the mechanical erosion in the uppermost part of the conduit is shown using this grouping. The result shows that the mechanical erosion of the conduit wall is concentrated in the part shallower than the fragmentation depth of magma in the conduit. Appling the conduit model of Miyakejima to other volcanoes, eruption process of several volcanoes such as Mt. Etna are reconstructed.

Free Research Field

火山学