scholarly journals The influence of upper mantle discontinuities on the toroidal free oscillations of the Earth

1979 ◽  
Vol 56 (2) ◽  
pp. 283-308 ◽  
Author(s):  
B. Kennett ◽  
G. Nolet
Keyword(s):  
Upper Mantle ◽  
Free Oscillations ◽  
Mantle Discontinuities ◽  
The Earth ◽  
Upper Mantle Discontinuities

Excitation of free oscillations of the earth by the Kurile Islands earthquake of 13 October 1963

1964 ◽  
Vol 54 (5A) ◽  
pp. 1341-1347
Author(s):  
L. E. Alsop
Keyword(s):  
Upper Mantle ◽  
Free Oscillation ◽  
Free Oscillations ◽  
Long Period ◽  
Kurile Islands ◽  
The Earth ◽  
Spectral Peaks ◽  
Good Agreement ◽  
Chilean Earthquake

Abstract Peaks corresponding to free oscillation of the earth have been observed in the spectrum of a seismogram written following the Kurile Islands earthquake of 13 October 1963 by a special long-period vertical seismograph, with a 60-second pendulum. The periods obtained for the free oscillations, which are all of the spheroidal type, and which lie in a range of 200 to 1000 seconds, are in good agreement with values previously obtained from the great Chilean earthquake of 22 May 1960. No spectral peaks are observed at periods shorter than 200 seconds. This same phenomenon was observed in the spectra of the Chilean earthquake, and it is probably associated with the properties of the vibrating medium, i.e., the upper mantle, rather than with the source.

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