Summary
The amplitude-distance curves of P waves, valid for the region of Central Asia, were derived in the distance range between 13° and 36° using observations of a network of eight Caucasian seismic stations. The curves are characterized by an anomalous increase of amplitudes between 13° and 20° followed by a large decrease of amplitudes in the distance range between 20° and 35°. Both the increase and decrease of amplitudes are interrupted by several local maxima. A comparison of the present amplitude curves with those derived for the regions of South-Eastern Europe and Asia Minor enabled us to correlate the individual local maxima of amplitude curves and to investigate the variation of their position due to the lateral inhomogeneity of the upper mantle structure in Eurasia.
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J. Vaněk: Revised Amplitude Curves of Seismic Body Waves for the Region of South-Eastern Europe. Studia geoph. et geod., 13 (1969), 173.
J. Vaněk, L. Christoskov: Amplitude Curves ofP andS Waves at Short Epicentral Distances. Bull. Int. Inst. Seism. Earthq. Eng., 8 (1971), 161.
J. Vaněk: Amplitude Curves of Seismic Body Waves for the Region of Asia Minor. Travaux Inst. Géophys. Acad. Tchécosl. Sci., No 246, Geofysikální sborník 1966, Academia, Praha 1967, 215.
J. Vaněk, J. Stelzner: Oscillatory Character of Amplitude Curves for Seismic Body Waves. Nature, 187 (1960), 491.
J. Vaněk: Amplitude Curves of Seismic Body Waves Between 5° and 25°. Bull. Seism. Soc. Am., 58 (1968), 1035.
J. Vaněk, A. Tskhakaya: Stancionnye popravki dlja opredelenija magnitud po objemnym volnam na nekotorych stancijach Kavkaza. Izv. AN SSSR, Fiz. Zemli, No. 7 (1967), 29.
J. Vaněk, J. Stelzner: Amplitudenkurven der seismischen Raumwellen. Gerl. Beitr. Geoph., 71 (1962), 105.
J. Vaněk, C. Sobotová: Wave Pattern and Maximum Amplitude of Short-PeriodP Waves at Epicentral Distances Between 9° and 25°. Studia geoph. et geod., 19 (1975), 134.
L. R. Johnson: Array Measurements ofP Velocities in the Upper Mantle. J. Geoph. Res., 72 (1967), 6309.
J. Zahradník: The Kinematic and Dynamic Properties of Seismic Waves in the Neighbourhood of Caustics. Acta Univ. Carol., Mathem. et Phys., 11 (1970), 77.
V. Červený, J. Zahradník: Amplitude-Distance Curves of Seismic Body Waves in the Neighbourhood of Critical Points and Caustics — A Comparison. Z. f. Geoph., 38 (1972), 499.
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A. Tskhakaya deceased in 1970.
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Vaněk, J., Tskhakaya, A. Amplitude curves ofP waves for the region of central Asia. Stud Geophys Geod 21, 259–267 (1977). https://doi.org/10.1007/BF01613254
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DOI: https://doi.org/10.1007/BF01613254