UNIGE document Scientific Article
previous document  unige:77114  next document
add to browser collection
Title

Simulating a multi-phase tephra fall event: inversion modelling for the 1707 Hoei eruption of Mount Fuji, Japan

Authors
Magill, Christina
Mannen, Kazutaka
Connor, Laura
Connor, Charles
Published in Bulletin of Volcanology. 2015, vol. 77, no. 9
Abstract Fuji Volcano last erupted in ad 1707 depositing approximately 40 mm of tephra in the area that is now central Tokyo. New high-resolution data describe 17 eruptive phases occurring over a period of 16 days (Miyaji et al., J Volcanol Geotherm Res 207(3–4):113–129, 2011). Inversion techniques were used in order to best replicate geological data and eyewitness accounts, and to estimate eruption source parameters. Inversion results based on data from individual eruptive phases suggest a total erupted mass of 2.09 × 1012 kg. Comparatively, results based on a single data set describing the entire eruption sequence suggest a total mass of 1.69 × 1012 kg. Values for total erupted mass determined by inversion were compared to those calculated using various curve fitting approaches. An exponential (two-segment) method, taking into account missing distal data, was found to be most compatible with inversion results, giving an erupted mass of 2.52 × 1012 kg when combining individual phases and 1.59 × 1012 kg when utilising a single data set describing the Hoei sequence. Similarly, a Weibull fitting method determined a total erupted mass of 1.54 × 1012 kg for the single data set and compared favourably with inversion results when enough data were available. Partitioning extended eruption scenarios into multiple phases and including detailed geological data close to the eruption source, more accurately replicated the observed deposit by taking into account subtleties such as lobes deposited during transient increases in eruption rate and variations in wind velocity or direction throughout the eruption.
Keywords Hoei eruptionInversion modellingMount FujiTephra dispersalTokyoVolcanic hazard
Identifiers
Full text
Structures
Research group Physical Volcanology and Geological Risk
Citation
(ISO format)
MAGILL, Christina et al. Simulating a multi-phase tephra fall event: inversion modelling for the 1707 Hoei eruption of Mount Fuji, Japan. In: Bulletin of Volcanology, 2015, vol. 77, n° 9. https://archive-ouverte.unige.ch/unige:77114

127 hits

25 downloads

Update

Deposited on : 2015-11-10

Export document
Format :
Citation style :