第一部門：物理数学力学問題 （B）

[S01B-06] Elastic Wave Propagation in a Granite at a Scale of Rock Forming Mineral Grains

*Kazushi Kimoto¹, Aoi Okano¹, Takahiro Saitoh² (1. Okayama University, 2. Gunma University)

Keywords:granite, rock-forming mineral grain, phase velocity, decay factor

This study investigates the propagation characteristics of P-wave traveling in a granite. Specifically, the local phase velocity and decay factor are evaluated experimentally for the P-wave using a granite plate specimen. In the experiment, ultrasonic P-waves transmitted in the thickness direction are measured by scanning the plate surface with a laser Doppler vibrometer (LDV). The phase velocity and decay factor are evaluated based on the phase delay and amplitude decay relative to a separately measured reference signal. The phase velocity and decay factor obtained thus are investigated statistically for each rock-forming mineral species. As a result, it is found that a stronger dispersion and dissipation take place in feldspar rather than in quartz.