Earth tide and tilt detection by a ring laser gyroscope

Details Earth tide and tilt detection by a ring laser gyroscope Earth tide and tilt detection by a ring laser gyroscope

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgrb..108.2132s&link_type=abstract

Journal of Geophysical Research (Solid Earth), Volume 108, Issue B2, pp. ETG 19-1, CiteID 2132, DOI 10.1029/2001JB000569

Physics

Optics

10

Electromagnetics: Optics, Exploration Geophysics: Instruments And Techniques, Geodesy And Gravity: Rotational Variations, Geodesy And Gravity: Tides-Earth, Geodesy And Gravity: Tides-Ocean (4560)

Scientific paper

An Earth tide signal at the lunar tidal period of 12 hours 25 min has been detected in the Sagnac frequency record of the C-II ring laser 30 m underground at Christchurch, New Zealand. Its amplitude, one part per million of the Earth rotation signal, is much greater than the value of 40 parts per billion expected. Tiltmeter records show that a substantial part of this amplification is geophysical, the lunar component of tilt having an amplitude of the order of 0.1-0.2 μrad, principally because of ocean loading of Banks Peninsula. The joint records also show effects on the Sagnac frequency associated with cavern deformation under ambient pressure and temperature change and with long-period waves in cavern tilt.

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