Japan Geoscience Union Meeting 2014

Presentation information

Print

International Session (Oral)

Symbol S (Solid Earth Sciences) » S-IT Science of the Earth's Interior & Techtonophysics

[S-IT03_29PM1] Structure and dynamics of Earth and Planetary deep interiors

Tue. Apr 29, 2014 2:15 PM - 4:00 PM 418 (4F)

Convener:*Satoru Tanaka(Institute for Research on Earth Evolution Japan Agency for Marine-Earth Science and Technology), Takashi Yoshino(Institute for Study of the Earth's Interior, Okayama University), Masanori Kameyama(Geodynamics Research Center, Ehime University), Dapeng Zhao(Department of Geophysics, Tohoku University), John Hernlund(ELSI, Tokyo TECH), Chair:Satoru Tanaka(Institute for Research on Earth Evolution Japan Agency for Marine-Earth Science and Technology), Hidenori Terasaki(Graduate School of Science, Osaka University)

3:30 PM - 3:45 PM

[SIT03-20] Relationship between sound velocity and density of liquid alloy under pressure

*Hidenori TERASAKI1, Keisuke NISHIDA2, Satoru URAKAWA3, Souma KUWABARA1, Yusaku TAKUBO1, Yuta SHIMOYAMA1, Kentaro UESUGI4, Akihisa TAKEUCHI4, Yoshio SUZUKI4, Yoshio KONO5, Yuji HIGO4, Tadashi KONDO1 (1.Osaka Univ., 2.Univ. Tokyo, 3.Okayama Univ., 4.JASRI, 5.HPCAT)

Keywords:Sound velocity, density, liquid, high pressure

It is important to understand the relationship between sound velocity and density of liquid Fe-alloys under high pressure for obtaining a constraint of the composition of the molten outer core from observed seismic data. We have studied a relationship between sound velocity and density of liquid alloy based on simultaneous measurement of these properties under high pressure and high temperature. Sound velocity was measured using ultrasonic pulse-echo overlapping method and density was measured employing X-ray absorption method combined with X-ray tomography technique. The measured P-wave velocity and density of liquid Ni?S both increase with pressure. From these data, adiabatic bulk modulus (KS0) of the liquid sample can be well constrained to 29 GPa. It is note that the measured P-wave velocity is found to increase linearly with increasing density. This result provides an important issue in terms of Birch's law for liquid material.