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Gravity meter observation of free modes excited by the August 19, 1977 Indonesia earthquake

EARTH AND ENVIRONMENTAL SCIENCE PROGRAMME YORK UNIVERSITY, DOWNSVIEW, ONTARIO M3J 1P3 Canada
DEPARTMENT OF MINING AND METALLURGICAL ENGINEERINGMCGILL UNIVERSITY, MONTREAL QUEBEC H3C 3G1 Canada

Abstract

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.

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