Low temperature mud-explosion of Mt. Yaké, Prefs. Nagano-Gifu, Central Japan, on 17th June 1962 as an example of endogenous katamorphism of volcanic rock at the destructive stage of the volcano

Morimoto, Ryohei; Ossaka, Jôyo

doi:10.1007/bf02597506

Cited by 3 publications

(2 citation statements)

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“…According to Oinouye ( 1971) , n1ud consisting of finely divided plagioclase, hypersthene, augite, magnetite, glass, and hematite was erupted in 1910 frmn five craters in the sum1nit of U su volcano in Japan. During an eruption of Y ake Dake in Japan in 1962, hot montmorillonite-bearing n1ud ejected from a vent on the volcano formed a small mudflow (Morimoto and Ossaka, 1964). From a study of andesitic breccias of Tertiary age in the Cascade Range of northet~l California, Durrell (1944) concluded that mudflows ean be extruded directly frmn volcanic fissures.…”

Section: Ways In Which Lahars Originatementioning

confidence: 99%

Postglacial lahars from Mount Rainier Volcano, Washington

Crandell¹

1971

Professional Paper

152

227

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Section: Ways In Which Lahars Originatementioning

confidence: 99%

Postglacial lahars from Mount Rainier Volcano, Washington

Crandell¹

1971

Professional Paper

152

227

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“…Eruptions of water-rich mud, breccia and hydrothermal water have been recorded from a number of active volcanoes and volcanic hydrothermal fields (Salton Sea volcanic field, California (Ellsworth 1992); Suoh volcanic field, Sumatra (Stehn 1934;GVN 1994); Tokachi-dake, Yake-dake and Usu volcanoes, Japan (Murai 1963;Morimoto & Ossaka 1964;Oinouye 1917, respectively)) as well as being associated with Unzen-type collapses (Siebert et al 1987). At both the Salton Sea and Suoh fields, the eruptions were associated with large earthquakes on adjacent faults: possible causes of this association are considered further below.…”

Section: Heating Of Pore Fluids: Aquathermal Effects In Volcanic Terrmentioning

confidence: 99%

Hydrothermal pore fluid pressure and the stability of porous, permeable volcanoes

Day

1996

118

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Lateral collapses of large volcanoes are commonly associated with phreatic explosions and other evidence for the presence of pressurized hydrothermal pore fluids within the volcanoes prior to collapse. Furthermore, hydrothermal alteration of volcanic edifices is a major factor in increasing susceptibility to collapse. This is generally held to be because of a reduction in effective friction coefficient # through alteration. However, this is inconsistent with an analysis of the factors affecting the strength of fluid-saturated rocks and volcanic debris in terms of the Rubey & Hubbert equations for shear failure of such materials. Instead, this analysis indicates that reductions in the strength of volcanic materials are mainly due to the effect of high pore pressure relative to confining pressure, expressed as the ratio & of the two. Consideration of field and seismic evidence, together with simple calculations, indicates that high values of, and large increases in, )~ are produced by a variety of mechanisms: heating of confined pore water by intrusions; degassing of intrusions; discharges of highly pressurized fluids from depth through clastic dykes; and by deformation associated with faulting. The sensitivity of pore fluid pressures to perturbation by these mechanisms is however highly dependent upon the permeability of their host rocks, which may itself be subject to rapid changes by fracturing, faulting and other processes. The rapidity of temperature changes and other mechanisms for pressurization in volcanic edifices means that the resultant pore pressure changes are large even in quite highly permeable rocks, but the effects are unpredictable. Detection of the development and spreading of high pore pressures within active volcanoes may however be possible by careful monitoring of patterns of seismicity.

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Phreatic Eruptions and Maars

Ollier

1974

Developments in Solid Earth Geophysics

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Low temperature mud-explosion of Mt. Yaké, Prefs. Nagano-Gifu, Central Japan, on 17th June 1962 as an example of endogenous katamorphism of volcanic rock at the destructive stage of the volcano

Cited by 3 publications

References 0 publications

Postglacial lahars from Mount Rainier Volcano, Washington

Postglacial lahars from Mount Rainier Volcano, Washington

Hydrothermal pore fluid pressure and the stability of porous, permeable volcanoes

Phreatic Eruptions and Maars

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