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Final Report, 16 July 1958-28 February 1961.
LAMONT GEOLOGICAL OBSERVATORY PALISADES N Y
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IN SEISMIC WAVE PROPAGATION, WAVES OF THE SECOND SHEAR MODE WERE OBSERVED, APPARENTLY FOR THE FIRST TIME AND THE SHORTER PERIOD OCEANIC SURFACE WAVES WITH MOTION ON ALL THREE RECORDING COMPONENTS WERE EXPLAINED AS A COMBINATION OF THE Love and first shear modes. Free periods of oscillation of the earth were observed and reported. The so-called leaking modes which result in the PL wave and in the long-period trains following S, SS, etc., were explained qualitatively. One study of particular interest was that of the radiation pattern of the southeast Alaska earthquake whereAMPLITUDES AND PHASE AS A FUNCTION OF AZIMUTH SHOWED A STRONG DEPENDENCE ON FAULT ORIENTATION. Long-period microseisms were studied. Longperiod waves both of the expected and unexpected types were rcorded from nuclear explosions in the air near surface and high altitude shots, in the water and underground at the Nevada Test Site. Of particular interest are the Love waves from the Russian explosions and the inversely dispersed Rayleigh waves observed at Honolulu from the high-altitude shots. Author
APPROVED FOR PUBLIC RELEASE