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The process of formation of seismic surface waves

Gutenberg, B. (1930) The process of formation of seismic surface waves. Bulletin of the Seismological Society of America, 20 (1). pp. 11-14. ISSN 0037-1106.

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The results of studies concerning the characteristics of the surface waves of earthquakes, carried on by many investigators, lead to the conclusion that: (a) in the case of near earthquakes, quite short and mostly irregular waves predominate, though at the same time, it is true, there appear as well very long waves; (b) the waves tend, with increasing distance, to become continuously longer and more regular; (c) at a distance equal to about a quarter of the earth's circumference, waves with periods of from twelve to twenty-four seconds contain the maximum energy. At still greater distances from the focus, the short waves are missing altogether; on the other hand, the waves of from thirty to fifty seconds period again become, in general, weaker, and after one complete circuit of the earth or still later (W_3 and W_4) one finds, as a rule, only very long waves (L) and waves with periods of from sixteen to twenty seconds. The two wave trains are propagated independently, the first with a velocity of from 4.4 to 4.5 kilometers per second, the second with approximately 3.3 kilometers per second and less.

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Additional Information:© 1930 Seismological Society of America. Manuscript dated at Darmstadt Germany, November 6, 1928. Translation completed at Ottawa, Canada, March 9, 1929. Translated by Ernest A. Hodgson.
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Record Number:CaltechAUTHORS:20140924-101119711
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49986
Deposited By: Tony Diaz
Deposited On:07 Oct 2014 04:22
Last Modified:03 Oct 2019 07:19

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