Alsop 1964

Alsop, L.E., 1964: Spheroidal free periods of the Earth observed at eight stations around the world. Bull. Seismol. Soc. America, 54, 755-776.

Spectral peaks corresponding to the spheroidal free periods of oscillation of the earth exist in the spectra of eight seismograms written at stations in different, parts of the world shortly after the great Chilean earthquake of 22 May l960. These data have been combined with those previously reported by various authors to obtain a very precise phase velocity vs period curve for Rialeigh waves in the period range of 200 to 3200 seconds. The observed spectral amplitudes lend sonic support to the assumption of a moving source, but, they also indicate that the present theory is not accurate. The vertical motion is found to be symmetric with respect to reflections through the pole.

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Alsop, L.E.: Spheroidal free periods of the Earth observed at eight stations around the world, Bull. Seismol. Soc. America, 54, 755-776, 1964.

Alsop, L.E. (1964), Spheroidal free periods of the Earth observed at eight stations around the world, Bull. Seismol. Soc. America, 54, 755-776.

Alsop, L.E., 1964: Spheroidal free periods of the Earth observed at eight stations around the world. Bull. Seismol. Soc. America, 54, 755-776.

Alsop, L.E. 1964, Bull. Seismol. Soc. America, 54, 755.

Alsop LE. Spheroidal free periods of the Earth observed at eight stations around the world, Bull Seismol Soc America 1964;54:755-776.

L.E. Alsop, Bull. Seismol. Soc. America 54, 755-776 (1964).