Experiment Observation of Torsion Wave Splitting in Anisotropic Medium

Abstract

Two shear wave vibration modes can be produced in laboratories: the shear vibration and the torsion vibration. The propagation characteristics of the torsion shear wave in anisotropic medium are observed using the torsion vibration transducers. The observations indicate that when the torsion waves without the polarization direction propagate in anisotropic media the shear wave splitting can be observed, and the velocities of the fast and slow shear waves are consistent with those of the fast and slow shear vibration waves. When the fast and slow torsion waves are received by torsion wave receivers, their waveforms are not affected by the anisotropic azimuth. Through observation with two homogeneous anisotropic samples of different origins, we preliminarily uncovered some propagation characteristics of the torsion wave in anisotropic medium.