earth oscillations

earth oscillations

[¦ərth ‚äs·ə′lā·shənz]
(geophysics)
Any rhythmic deformations of the earth as an elastic body; for example, the gravitational attraction of the moon and sun excite the oscillations known as earth tides.
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An important problem was adaptation of the hydrodynamic system of the tiltmeter for registration of phenomenon of free Earth oscillations. It was necessary to introduce low-pass, strongly-dumping filters into the hydrodynamic system.

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