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Belfi, Jacopo; Beverini, Nicolo; Bosi, Filippo; Carelli, Giorgio; Cuccato, Davide; Luca, Gaetano di; Virgilio, Angela di; Gebauer, Andre; Maccioni, Enrico; Ortolan, Antonello; Porzio, Alberto; Saccorotti, Gilberto; Simonelli, Andreino; Terreni, Giuseppe (2017): Deep underground rotation measurements: GINGERino ring laser gyroscope in Gran Sasso. In: Review of Scientific instruments, Vol. 88, No. 3, 34502
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GINGERino is a large frame laser gyroscope investigating the ground motion in the most inner part of the underground international laboratory of the Gran Sasso, in central Italy. It consists of a square ring laser with a 3.6 m side. Several days of continuous measurements have been collected, with the apparatus running unattended. The power spectral density in the seismic bandwidth is at the level of 10(-10) (rad/s)/root Hz. A maximum resolution of 30 prad/s is obtained with an integration time of few hundred seconds. The ring laser routinely detects seismic rotations induced by both regional earthquakes and teleseisms. A broadband seismic station is installed on the same structure of the gyroscope. First analysis of the correlation between the rotational and the translational signal is presented. Published by AIP Publishing.