Time Domain Analysis of Earth Tide Records

Abstract

A method of time domain analysis for earth tides is described. The analysis is to correlate the observed records with the corresponding theoretical time series predicted for a laterally homogeneous solid earth, without resolving the records into a number of tidal constituents. Simple explicit expressions of theoretical tidal strains and tilts are derived for this purpose as a function of time. The least squares technique in the time domain gives the overall tidal admittance averaged over tidal frequencies. The admittance thus estimated will be useful as a diagnostic means to detect possible temporal variations in crustal rigidity due to dilatancy in seismic source regions.