DOREL ZUGRAVESCU
Centrul de Fizica Pamantului si Seismologie, Laboratorul de Geodinamica si
Analiza Numerica, Bucuresti
EARTH TIDES RECORDINGS IN ROMANIA,
SPECIFIC SENSORS AND AUXILIARY APPARATUS
(Abstract)
Within the framework of a complex geodynamical observatory it is desirable
to make conspicuous as much as possible directly observable phenomena, causally
connected with globe deformations, as well as temperature variations, respectively
air pressure variations having to be monitored; all these phenomena are to
be, as far as possible, continuously recorded, so as to secure a storage of
information making its contingent losses practically impossible.
Consequently, the standard apparatus equipping a geodynamical observatory has
to consists of tiltgraphs, gravitographs, straingraphs, thermographs, barographs,
of systems assuring the universal time basis, respectively of sysems assuring
continuous recording of data, in analogical or numerical way, respectively
of auxiliary systems assuring autonomous energy supply during an accidental
tension failure of the electrical network.
After having shown the magnitude order of the phenomena to be put into evidence
by the specific sensors, the paper gives the constructive variants of these
sensors, specifying also the variants effectively equipping the geodynamical
observatories; the auxiliary systems, realized and experimented, are also enumerated.
Then, it is shown that the apparatus have been constructed as interchangeable
modules, in such a way that their multiplication be profitable and the continuity
of accomplished recordings be secured by means of a minimum effort.
Finally, it is shown that, by suitable adjustments, the accomplished apparatus
can also satisfy some specific problems of other research fields (equipping
the geodynamic polygons for monitoring earthquake precursors with a view to
earthquake prediction, respectively equipping massive construction e.g. dams,
in order to follow local deformations, produced in and by the dams, to warn
contingent disasters).
Key words: Geodynamics, Earth tides, Tiltgraphs, Gravitographs, Stratigraphs,
Limnigraphs, Thermographs, Barographs.