Open AccessSpatial analysis of tilt and gravity observations of Earth tides in western Europe
Author(s) -
Souriau Marc
Publication year - 1979
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1979.tb06780.x
Subject(s) - tilt (camera) , geodesy , geology , ocean tide , gravimetry , gravimeter , geophysics , mathematics , geometry , geotechnical engineering , casing , reservoir modeling
Summary. Tidal gravity and tilt data are available with a great density in western Europe, so that local and regional variability of Earth tides are well documented. O1 and M2 are the most reliable waves and the relevant ocean loads are deduced from some cotidal charts and from Green's functions given by Farrell. The reliability of the charts is proved a posteriori by the convergence of O1 and M2 with respect to body tides for tilt and gravity. It is shown that a spatial trend of the gravimetric factor exists but cannot be analysed because of scatter in the data. For tilt tides the importance of the load due to the Bay of Biscay is emphasized; by considering tilt and strain powers, it is shown in a global approach that the noise is in favour of a local tilt‐strain coupling, and it is proved that in each station a quantitative estimate of this phenomenon can be obtained by a statistical analysis derived from a theoretical scheme (King et al. ) in as much as the ocean load is known with sufficient accuracy; an appraisal of the diminishing tilt factor is then deduced simultaneously.