Dispersion of Rayleigh waves produced by nuclear explosions. Crustal structure of western Europe

TL;DRAbstract

Most of the nuclear explosion fired near Novaya-Zemlyaisland from September 1961 to J a n u a r y 1963 (21 in total) have been recordedon the seismographs of Toledo Observatory. The study of these records,mainly concerning the dispersion of Rayleigh waves, has been the purposeof this paper.A crust-mantle s t r u c t u r e for t h e Zemlya-Toledo p a t h has been determinedby means of group velocity curves and especially by the phase velocityones obtained from Rayleigh waves of explosions. This structure supposesa crust of about 40 kms thick with an upper sedimentary layer with athickness of about 5,5 kms and a shear velocity of 2,3 km/sec.The average shear velocity in the granitic and basaltic layers jointly,is about 3,65 km/sec, permitting a small ambiguity at the position of theConrad discontinuity between them.A velocity of 4,5 km/sec has been assigned for the underlying crustmaterial, but a better agreement with the data recorded is obtained bytaking 0.28 for the Poisson ratio valu

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