Browsing Геология России by Author "Ichihara M."

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DYNAMICS OF BUBBLE OSCILLATION AND WAVE PROPAGATION IN VISCOELASTIC LIQUIDS

Ichihara M.; Ohkunitani H.; Kameda M.; Ida Y. (2004)

Decrease of the velocity of a pressure wave in magma by the presence of bubbles is regarded as a fundamental process in seismoacoustic activities of a volcano. However, we show that the large viscosity of magma (≥105 Pa ...
FRAGMENTATION OF A POROUS VISCOELASTIC MATERIAL: IMPLICATIONS TO MAGMA FRAGMENTATION

Ichihara M.; Rittel D.; Sturtevant B. (2002)

Fragmentation of vesicular magma by rapid decompression is one of the most likely triggers for explosive eruptions. In this phenomenon the decompression rate and the viscoelastic nature of magma are considered to be key ...
PROPAGATION OF ACOUSTIC WAVES IN A VISCO-ELASTIC TWO-PHASE SYSTEM: INFLUENCES OF THE LIQUID VISCOSITY AND THE INTERNAL DIFFUSION

Ichihara M.; Kameda M. (2004)

The main purpose of the present paper is to present the mathematical expression for the frequency-dependent effective acoustic properties of a liquid–bubble mixture. Effects of the bubble resonance, the heat and mass ...
PROPAGATION OF ACOUSTIC WAVES IN A VISCOELASTIC TWO-PHASE SYSTEM: INFLUENCE OF GAS BUBBLE CONCENTRATION

Marchetti E.; Ripepe M.; Ichihara M. (2004)

Volcanic explosions generate pressure perturbations in the atmosphere and a seismic wavefield in the ground. The source is therefore well coupled with the atmosphere and the ground. The acoustic and elastic wavefields ...

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