Gutenberg, B. (1948) On the layer of relatively low wave velocity at a depth of about 80 kilometers. Bulletin of the Seismological Society of America, 38 (2). pp. 121-148. ISSN 0037-1106. doi:10.1785/BSSA0380020121. https://resolver.caltech.edu/CaltechAUTHORS:20140731-143020093
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Abstract
More than twenty years ago, the author (Gutenberg, 1926) pointed out that the longitudinal waves of shallow earthquakes decrease considerably in amplitude at epicentral distances between a few (say 2) degrees and about 15 degrees. At greater distances the amplitudes become again rather large, at 16° epicentral distance about as large as at 2°. With further increase in epicentral distance the amplitudes decrease slowly, The whole phenomenon was interpreted as due to a decrease in wave velocity at a depth between 70 and 80 km. Further investigations (Gutenberg and Richter, 1931; 1935, pp. 335-343; 1939a; Gutenberg, 1945a; 1945c, pp. 126-127) indicate that the decrease in velocity must be rather small, that the shadow zone is less significant in earthquakes which start at a depth of 150 to 250 km. and is absent in earthquakes originating at a depth of more than about 300 km.
Item Type: | Article | ||||||
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Additional Information: | Copyright © 1948 by the Seismological Society of America. Manuscript received for publication December 11, 1947. | ||||||
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Issue or Number: | 2 | ||||||
DOI: | 10.1785/BSSA0380020121 | ||||||
Record Number: | CaltechAUTHORS:20140731-143020093 | ||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140731-143020093 | ||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
ID Code: | 47728 | ||||||
Collection: | CaltechAUTHORS | ||||||
Deposited By: | George Porter | ||||||
Deposited On: | 31 Jul 2014 21:43 | ||||||
Last Modified: | 28 Jan 2022 16:10 |
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