Anisotropy of ultrasonic seismic velocities and periods in a zone of tectonic disturbance : Silaeva, O I Geophys J R Astr Soc V76, N1, Jan 1984, P261–268 (Paper to the Proceedings of the 1st International Workshop on Seismic Amisotropy, Suzdal, 11–19 May 1982)