Earth Tides

Groundwater level changes induced by the 2011 Tohoku earthquake in China mainland

“…The calculating error was given as root mean square error (RMSE). It should be noted that S 1 /K 1 and S 2 are not pure gravitational tides, but also contain an unknown contribution of radiational-sometimes called thermal-tides (Agnew 2007). Thus, for the discussion with respect to Earth tides, the focus of this work is on the purely gravitational tidal bands M 2 and O 1 .…”

Observational evidences for the speed of the gravity based on the Earth tide

“…(1), all positions with subscript '*' indicate that the positions are all the apparent positions. Since the true positions of the Sun cannot be observed directly, geophysicists and astrophysicists have to use the apparent positions of the Sun instead of corresponding true positions in the Newtonian formula of solar tidal force [5,6], i.e. the solar tidal force that gets calculated is actually the tidal force of the Sun as it was issued from its apparent position and at a retarded time…”

“…The vector sum of the lunar tidal force, solar tidal force and this additional force creates the phase lag of Earth tide, i.e. the phase of the observational curves lags that of the theoretical curve of Earth tide [5,6].…”

Dangaus kūnu lemiamo potvynio potencialo zoniniu bangu analize

“…Mažiau patikimai įvertinamas potvynio potencialo zoninių bangų poveikis (Agnew 2007). Tai lemia skirtingas Žemės sunkio lauko ekvipotencialinių paviršių ir Žemės paviršiaus interpretacijas (Mäkinen et al 2006;McCarthy, Petit 2004), todėl aktualu išsamesnis zoninių bangų tyrimas.…”