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Amplitudes of surface waves and magnitudes of shallow earthquakes

Gutenberg, B. (1945) Amplitudes of surface waves and magnitudes of shallow earthquakes. Bulletin of the Seismological Society of America, 35 (1). pp. 3-12. ISSN 0037-1106. doi:10.1785/BSSA0350010003.

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A study of amplitudes of surface waves having periods of about 20 seconds is employed to improve the calculation of magnitudes of distant shallow earthquakes. Table 3 gives station corrections; table 4, revised figures for the effect of epicentral distance. It is found that for epicentral distances between about 20° and 175° the average observed amplitudes correspond closely to those calculated with an absorption coefficient k = 0.0003 per km. For paths completely outside or inside the Pacific Basin, k = 0.0002± per km., while for paths tangent to its boundary the amplitudes of surface waves with periods of about 20 seconds may be reduced by two-thirds or more (in extreme cases by almost nine-tenths) through reflection or refraction of energy; such seismograms of shallow shocks may be taken as indicating intermediate depth of focus.

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Additional Information:Copyright © 1945 by the Seismological Society of America. Manuscript received for publication June 2, 1944
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Balch Graduate School of the Geological Sciences372
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47674
Deposited By: George Porter
Deposited On:31 Jul 2014 20:29
Last Modified:10 Nov 2021 17:49

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