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dc.contributor.authorallYokoyama, I.; Higashi 1-17-7-1304, Kunitachi, Tokyo 186-0002 Japanen
dc.description.abstractIn the discussion of lava dome formation, viscosity of magma plays an important role. Measurements of viscosity of magmas in field and laboratory are briefly summarized. The types of lava dome emplacements are classified into two, squeeze- and spine-type, by kinetic processes. The squeeze-type is the formation of a dome as a result of squeezes of magma through conduits and the latter is solidified magma forced to ascend by underlying fluid magma. An important parameter in the formation of such lava domes is their growth rates. Lava domes of squeeze-type are governed by the Hagen-Poiseuille Law which involves their viscosoties and other eruption parameters. At present, the real viscosity of magmas at the site of lava dome is still inaccessible. In order to avoid uncertainty in viscosity of magmas, a conception of «macroscopic viscosity» is proposed, which involves effects of chemical components, mainly SiO2 and volatile material, crystals and temperature, and their changes with time. Lava dome formations during the 20th century are briefly examined and their growth rates are estimated. The relationship between the growth rates and the SiO2 content of the magma is statistically studied, and the macroscopic viscosity is empirically expressed as a function of SiO2 content. The linearity between the two parameters is reasonably interpreted. This means that formation processes of lava domes are dominantly controlled by macroscopic viscosity of magma.en
dc.format.extent294674 bytesen
dc.relation.ispartofAnnals of Geophysicsen
dc.relation.ispartofseries6/48 (2005)en
dc.subjectlava domesen
dc.subjectsqueeze of magmaen
dc.subjectgrowth rates of domesen
dc.subjectHagen-Poiseuille Lawen
dc.subjectmacroscopic viscosityen
dc.titleGrowth rates of lava domes with respect to viscosity of magmasen
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.03. Magmasen
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dc.description.journalTypeJCR Journalen
dc.contributor.authorYokoyama, I.en
dc.contributor.departmentHigashi 1-17-7-1304, Kunitachi, Tokyo 186-0002 Japanen
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crisitem.classification.parent04. Solid Earth- 1-17-7-1304, Kunitachi, Tokyo, Japan-
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