# Deep underground rotation measurements: GINGERino ring laser gyroscope in Gran Sasso

## TL;DR

GINGERino, a large underground ring laser gyroscope at Gran Sasso, effectively measures seismic rotations with high resolution, capturing signals from regional and teleseismic events, and correlates rotational and translational ground motions.

## Contribution

This paper presents the first underground implementation of a large ring laser gyroscope for seismic rotation measurements, demonstrating its high sensitivity and correlation with translational seismic signals.

## Key findings

- Achieved a resolution of 30 prad/s with few hundred seconds integration
- Detected seismic rotations from regional earthquakes and teleseisms
- Established initial correlation between rotational and translational signals

## Abstract

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 $10^{-10} \rm{(rad/s)/\sqrt{Hz}}$. A maximum resolution of $30\,\rm{prad/s}$ 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 are presented.