The process of formation of seismic surface waves
- Creators
- Gutenberg, B.
Abstract
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.
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.Attached Files
Published - 11.full.pdf
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Additional details
- Eprint ID
- 49986
- Resolver ID
- CaltechAUTHORS:20140924-101119711
- Created
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2014-10-07Created from EPrint's datestamp field
- Updated
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2019-10-03Created from EPrint's last_modified field