Takao Koyama

A semi‐global reference model for electrical conductivity in the mid‐mantle beneath the north Pacific region

Hisashi Utada, Takao Koyama, Hisayoshi Shimizu et al. · Geophysical Research Letters · 2003 · 109 citations · Full text

Geophysics, Applied Geophysics, Marine Geology +15

Three‐dimensional resistivity structure and magma plumbing system of the Kirishima Volcanoes as inferred from broadband magnetotelluric data

Koki Aizawa, Takao Koyama, H. Häse et al. · Journal of Geophysical Research Solid Earth · 2013 · 102 citations · Full text

Magmatic Process, Volcanology, Engineering +22

Stability and compressibility of the high-pressure phases of Al2O3 up to 200 GPa: Implications for the electrical conductivity of the base of the lower mantle

Shigeaki Ono, Artem R. Oganov, Takao Koyama et al. · Earth and Planetary Science Letters · 2006 · 86 citations

Materials Science, Mineral Physic, High-pressure Phases +9

Three-dimensional resistivity structure of Asama Volcano revealed by data-space magnetotelluric inversion using unstructured tetrahedral elements

Yoshiya Usui, Yasuo Ogawa, Koki Aizawa et al. · Geophysical Journal International · 2016 · 81 citations · Full text

Hydrogen diffusivity in wadsleyite and water distribution in the mantle transition zone

Ryota Hae, Eiji Ohtani, Tomoaki Kubo et al. · Earth and Planetary Science Letters · 2006 · 79 citations

Engineering, Geology, Hydrogen Diffusivity +7