Fróðskaparrit - 01.01.1975, Síða 37

Earth Tides
45
in the case of homothetic deformations and, without this
assumption:
k/h < 0.4989
we can be satisfied with Oi value.
Consequently, as a first approximation I should recommend
to adopt k/h = 0.499 and check the values of h and k at
each place from tidal gravity variations only which should
indicate if there is any anomalous behaviour at the place
concerned.
Such a check is necessary because the known numerica!
results concern presently only one part of Europe. As an
exemple Scandinavia is giving quite different results for
gravimeters but not for pendulums.
2. The Trans World Tidal Gravity Profile
Several North American profiles have been completed by
John T. Kuo covering United States and South East of
Canada. They are tied with Bruxelles station (calibrations
are in agreement within 0,5 °/o between Bruxelles and New
York).
Several European profiles are also completed by B. Du-
carme and P. Melchior from South of France, Italy, Austria
through Germany, Switzerland, Belgium, Holland, Den-
mark and England. New stations are planned in Spain,
Portugal and Scandinavia. A separate profile has been
made in Finland (T. Honkasalo). All the instruments have
been calibrated at Bruxelles for amplitude and phase.
To solve the different described problems, it is of primary
importance that the different transcontinental profiles will
be tied together.
A first positive step has been completed by making a 6
months period of observation at Torshavn/Faroe.
This should allow to tie Europe with North America as