Long range propagation of seismic energy in the lower lithosphere
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Vols. 1-18 (1924-1944), ISSN 0044-2801
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Abstract
Observations of seismic arrivals from the lower lithosphere in France revealed a low mean velocity of observed first arrivals of about 8.1 km/s between 150 and more than 1,000 km distance and several high velocity phases with apparent velocities between about 8.2 and 8.6 km/s. Each one of these high velocity phases is only observed over a range of about 100 or 200 km. The possibility of interpreting these phenomena in terms of fine structure of the lower lithosphere is investigated. The resulting model consists of alternating high and low velocity layers. No first order discontinuities seem to exist between these layers. A reliable quantitative estimate of the thickness of these high and low velocity zones can only be obtained by a joint travel time and amplitude study.
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References
Fuchs, K., Muller, G. (1971) Computation of synthetic seismograms with the reflectivity method and comparison with observations. Geophys. J. R. Astron. Soc. 23:417-433
Groupe Grands Profils Sismiques (France), German Research Group for Explosion Seismology, Swiss Deep-Seismic Souding Group (1973) Lateral variations in the structure of the lower lithosphere in France. Paper presented at the first Meeting of the European Geophysical Society, Zurich
Hales, A.L., Helsley, D.E., Nation, J.B. (1970) P traveltimes for an oceanic path. J. Geophys. Res. 75:7362-7381
Hirn, A. (1973) Data on the lower lithosphere from recent seismic profiles in France. Paper presented at the first Meeting of the European Geophysical Society, Zurich
Hirn, A., Steinmetz, L., Kind, R., Fuchs, K. (1973) Long range profiles in Western Europe: II. Fine structure of the lower lithosphere in France (southern Bretagne). Z. Geophys. 39:363-384
Kosminskaya, I.P., Puzyrev, N.N., Alekseyev, A.S. (1972) Explosion seismology: its past, present and future. In: Ritsema, A.R. (Ed.) The upper mantle. Tectonophysics 13:309-323
Masse, R.P. (1973) Compressional velocity distribution beneath central and eastern North America. Bull. Seism. Soc. Am. 63:911-935
Mayer-Rosa, D., Muller, St. (1973) The gross velocity-depth distribution of P- and Swaves in the upper mantle of Europe from earthquake observations. J. Geophys. 39:395-410
Muller, G. (1971) Approximate treatment of elastic body waves in media with spherical symmetry. Geophys. J. R. Astron. Soc. 23:435-449
Ryaboi, V.Z. (1966) Kinematic and dynamic characteristics of deep waves associated with boundaries in the crust and upper mantle. lzv. (Bull.) Acad. Sci. USSR, Geophys. Ser., AGU Transl., 3:177-184