We report on the measurements of tilt noise performed at the Virgo site with
a ring laser gyroscope. The apparatus is a He-Ne laser operating in a square
cavity mounted on a vertical plane perpendicular to the north-south arm of the
inteferometer. We discuss the possibility of using the ring laser signal to
improve the performances of the control system of the Virgo seismic
suspensions. The comparison between the ring laser signal and the control
signals for the longitudinal translations of the inverted pendulum (IP) shows
remarkable coherence in the frequency range 20-200 mHz.Comment: 4 pages, Proceedings of 46th Rencontres de Morion
