John A. Linton, D. E. Smylie, O. G. Jensen; Gravity meter observation of free modes excited by the August 19, 1977 Indonesia earthquake. Bulletin of the Seismological Society of America ; 69 (5): 1445–1454. doi:
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Free modes with signal-to-noise ratio in the range of 40 to 55 dB were observed in the record taken by a vertical broadband quartz fiber gravimeter system opeating in Montreal following the event of August 19, 1977 in Indonesia. The large signal-to-noise ratio has permitted very stable Q estimates to be made for a number of the fundamental spheroidal modes. The very long-period band shows no definitive evidence of signal other than the expected tidal lines.