Power spectrum analysis of the Telluric Field at Tbilisi, U.S.S.R., for periods from 2.4 to 60 minutes

Power spectrums are computed for the east-west and north-south components of the telluric field at Tbilisi, U.S.S.R., over a frequency band corresponding to periods from 2.4 to 60 minutes. Ten-hour samples for each of four successive days and for each of four successive nights are analyzed, and curves of the average density of the power spectrum are presented. The results suggest that the average spectrum for the east-west component becomes smoother as the total length of the samples increases. On the other hand, the average spectrum for the north-south component shows numerous lines which are more clearly defined at night than at day. This article contains supplementary material.