EGU2020-21959
https://doi.org/10.5194/egusphere-egu2020-21959
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

GINGERINO and the GINGER Project

Angela D. V. Di Virgilio
Angela D. V. Di Virgilio
  • INFN, PISA-ITALY, Pisa, Italy (angela.divirgilio@pi.infn.it)

GINGER (Gyroscopes IN General Relativity) is a proposal aiming at measuring the Lense-Thirring effect with an experiment based on Earth. It is based on an array of ring lasers, at present the most sensitive inertial sensors to measure the rotation rate of the Earth.

Rotation and angular measurements are of great importance for various fields of science: General Relativity predicts rotation terms originated from the kinetic term, Earth Science studies the Earth's angular velocity with its variations, the tides and related perturbations, the normal modes of the Earth, the angular perturbations associated to the movement of the plates, the deformations of hydrological nature, without neglecting the rotational signals produced by the earthquakes. A ring laser integral to the Earth's surface is sensitive not only to the angular rotation of the planet, but also to global and local rotational signals. For this reason GINGER is relevant for geophysics.

GINGERINO is a ring laser prototype installed inside the underground laboratory of the Gran Sasso. Its typical sensitivity is well below 0.1 nrad/s in 1 second measurement, and it is acquiring data on a continuous basis since several years. The most recent data of GINGERINO and the results relevant for geoscience are discussed.

How to cite: Di Virgilio, A. D. V.: GINGERINO and the GINGER Project, EGU General Assembly 2020, Online, 4–8 May 2020, EGU2020-21959, https://doi.org/10.5194/egusphere-egu2020-21959, 2020

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Display material version 1 – uploaded on 13 Apr 2020
  • CC1: Comment on EGU2020-21959, Christian Bizouard, 07 May 2020

    Very impressive experiment! According to Fig. 3 you have measured the zonal tide effect on Earth angular speed.  What about your determiantion at sub-daily/hourly time resolution? Is that too bad?  In particular can you get diurnal/half-diurnal variation produced by ocean tides?    

  • AC1: Comment on EGU2020-21959, Angela D. V. Di Virgilio, 07 May 2020

    Thanks

    I'm interested mainly in the apparatus, in order to answear your question I should discuss directly with you.

    • CC2: Reply to AC1, Christian Bizouard, 07 May 2020

      Yes it would be better. I only wonder whether you can get a precision of about 0.1 s at sub-daily time scale. Then Sagnac interferometer could constitute a real alternative to astro-geodetic technique.  

      • AC2: Reply to CC2, Angela D. V. Di Virgilio, 07 May 2020

        in principle the RLG can be even facter than 1ms, but of course details of the experimental apparatus must be taken into account. Our experimental set-up is at presente rather simple.

  • CC3: Comment on EGU2020-21959, Christian Bizouard, 07 May 2020

    Present uncertainty on length of day at hourly time scale: 0.01 ms. For d omega3, corresponding uncertainty is 0.01/86400 * 7e-5 ~ 7 e-12 rad/s.

  • AC3: Comment on EGU2020-21959, Angela D. V. Di Virgilio, 07 May 2020

    I have to think to all that. In principle RLG can do a lot, but not GINGERINO