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On the layer of relatively low wave velocity at a depth of about 80 kilometers

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. 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
Related URLs:
URLURL TypeDescription
http://bssa.geoscienceworld.org/content/38/2/121.full.pdf+htmlPublisherArticle
Additional Information:Copyright © 1948 by the Seismological Society of America. Manuscript received for publication December 11, 1947.
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Balch Graduate School of the Geological Sciences Contribution420
Issue or Number:2
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:03 Oct 2019 06:56

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