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Bulletin of the Seismological Society of America; August 1975; v. 65; no. 4; p. 915-926
© 1975 Seismological Society of America
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P-wave amplitude variation with epicentral distance and the magnitude relations

K. L. KAILA and DIPANKAR SARKAR

NATIONAL GEOPHYSICAL RESEARCH INSTITUTE, HYDERABAD 500007 India

Abstract

Investigation of the variation of P-wave amplitudes and d2T/d{Delta}2 with epicentral distance reveals that the amplitudes in the distance range up to 100° can be represented by seven discontinuous curves. The discontinuous nature of the amplitude curves can be explained due to the possible existence of first- or second-order velocity discontinuities in the upper and lower mantle of the Earth. Seven magnitude relations corresponding to these amplitude curves are given, which yield consistent magnitudes for nuclear explosions as well as for shallow earthquakes.






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