1961
DOI: 10.1029/jz066i002p00631
|View full text |Cite
|
Sign up to set email alerts
|

Free oscillations of the Earth observed on strain and pendulum seismographs

Abstract: Spectral analyses of seismograms of the great Chilean earthquake of May 22, 1960, from a newly installed strain seismograph at Ogdensburg, New Jersey, and from pendulum seismographs at Palisades, New York, have revealed spectral peaks corresponding to fundamental spheroidal modes 2 to 34, fundamental torsional modes 2 to 9, and the first overtone of the second spheroidal mode. Other peaks, some of which may be overtones, occur in the spectra but are not yet identified. Amplitudes of some observed spectral peak… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
2
1

Citation Types

0
29
1

Year Published

1962
1962
2021
2021

Publication Types

Select...
5
4

Relationship

0
9

Authors

Journals

citations
Cited by 100 publications
(30 citation statements)
references
References 8 publications
0
29
1
Order By: Relevance
“…The interval for background analysis was chosen just before the earthquake. The theoretical eigenfrequencies are indicated by vertical dashed lines and taken from ALSOP et al (1961).…”
Section: The Results Of Observationsmentioning
confidence: 99%
“…The interval for background analysis was chosen just before the earthquake. The theoretical eigenfrequencies are indicated by vertical dashed lines and taken from ALSOP et al (1961).…”
Section: The Results Of Observationsmentioning
confidence: 99%
“…These authors also computed a spheroidal mode spectrum from the Kamchatka earthquake (1952 November 5 ) recorded by a vertical long-period seismograph at Palisades (New York). A frequency analysis (Alsop, Sutton & Ewing 1961) of data recorded by a strain seismograph at Ogdensburg (New Jersey) and by pendulum seismographs at Palisades (New York), revealed spectral peaks identified as fundamental spheroidal modes 2 to 3 4 and the first overtone of the second spheroidal mode. A long-period vertical seismograph operated at Chester (New Jersey) also recorded a series of 3 4 fundamental spheroidal modes, together with some spheroidal mode overtones (Bogert 1961).…”
Section: Introductionmentioning
confidence: 99%
“…In particular, both spheroidal and torsional oscillations were revealed by a power spectral analysis of seismograms recorded by different seismographs. Alsop et al (1961) analysed periods of the graver modes of oscillations with a strain seismograph and a pendulum seismograph. Derr (1969) estimated an earth model through leastsquares inversion with weighted means of observed periods of free oscillations recorded by spring gravimeters.…”
Section: Introductionmentioning
confidence: 99%