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Bulletin of the Seismological Society of America; December 1982; v. 72; no. 6A; p. 2089-2106
© 1982 Seismological Society of America
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Attenuation of regional phases in Western Europe

MARC NICOLAS, BERNARD MASSINON, PIERRE MECHLER and MICHEL BOUCHON

LABORATOIRE DE GÉOPHYSIQUE APPLIQUÉE UNIVERSITÉ PARIS VI, T. 15-E.2 4 PLACE JUSSIEU 75230 PARIS CEDEX 5, France
LABORATOIRE DE DÉTECTION ET DE GÉOPHYSIQUE COMMISSARIAT À L'ENERGIE ATOMIQUE, B.P. 136 92124 MONTROUGE CEDEX, France
LABORATOIRE DE GÉOPHYSIQUE INTERNE UNIVERSITÉ SCIENTIFIQUE ET MÉDICALE DE GRENOBLE, B.P. 53 X 38041 GRENOBLE CEDEX, France

Abstract

The purpose of this study is to evaluate the attenuation of local seismic phases in France. We use the 25 short-period vertical stations of the French seismic network and select a set of six earthquakes which occurred in France or in its vicinity, and within a range of epicentral distances from 1° to 10°. We have determined the attenuation versus distance for Pn, Sn, Pg, and Lg phases and analyzed the influence of frequency. Attenuation coefficients for Pn and Sn waves are of the order of 2. They are slightly higher for Pg (2.3) and Lg (2.5) waves, but the amplitude of these waves is largely dependent on the azimuth of propagation. Lg/Pg ratios present a large scatter between 1 and 10 with a mean trend around 3 to 4. We found that the Lg anelastic attenuation coefficient is of the order of 0.2 deg–1 at 1 Hz, a result to be compared with the values of 0.07 deg–1 (Eastern United States), 0.15 deg–1 (Northern USSR), and 0.35 deg–1 (south of the Caspian Sea) obtained by Nuttli (1973, 1981). The quality factor, computed for each one of these local phases, shows a clear dependence on frequency, increasing from around 100 at 1 Hz to around 1000 at 16 Hz.




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