Last Update 02/22 2011
Research: The major goal of my study is to understand the interaction between microstructural processes and macroscopic dynamics of partially molten rocks. For this purpose, I experimentally investigate microstructural evolution in a deforming partially molten rock analogue. Also, to connect the experimentally observed microstructural processes to the macroscopic dynamics, I theoretically derive mechanical constitutive relations as functions of microstructural parameters. So far, I found that stress-induced microstructural anisotropy observed in the experiment causes strong viscous anisotropy and then significantly enhances a coupling between matrix shear flow and melt migration. I also investigate the effects of melt on seismic wave velocities and attenuation to derive information on the actual melt distribution in the mantle from seismic tomographic images. Publications: Yasuko Takei and Mineo Kumazawa, Why have the single force and torque been excluded from seismic source models?, Geophys. J. Int., 118, 20--30, 1994. Yasuko Takei, Constitutive mechanical relations of solid-liquid composites in terms of grain-boundary contiguity, J. Geophys. Res., 103, 18183--18203, 1998. Yasuko Takei, Acoustic properties of partially molten media studied on a simple binary system with a controllable dihedral angle., J. Geophys. Res., 105, B7, 16665--16682, 2000. Yasuko Takei, Effect of pore geometry on Vp/Vs: From equilibrium geometry to crack, J. Geophys. Res., 107, B2, ECV6-1--ECV6-12, 2002. Yasuko Takei and Ichiko Shimizu, The effects of liquid composition, temperature, and pressure on the equilibrium dihedral angles of binary solid-liquid systems inferred from a lattice-like model., Phys. Earth Planet. Inter., 139, 225--242, 2003. Yasuko Takei and Benjamin K. Holtzman, , Viscous constitutive relations of solid-liquid composites in terms of grain boundary contiguity: 3. Causes and consequences of viscous anisotropy, , J. Geophys. Res., 114, B06206, doi:10.1029/2008JB005852, , 2009. Yasuko Takei and Benjamin K. Holtzman, Viscous constitutive relations of solid-liquid composites in terms of grain boundary contiguity: 1. Grain boundary diffusion control model, J. Geophys. Res., 114, B06206, doi:10.1029/2008JB005850, , 2009. Yasuko Takei, Stress-induced anisotropy of partially molten rock analogue deformed under quasi-static loading test , J. Geophys. Res. , 115, B03204, doi:10.1029/2009JB006568, , 2010. |
