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High-frequency attenuation by a thin high-velocity layer

Mellman, George R. and Helmberger, Donald V. (1974) High-frequency attenuation by a thin high-velocity layer. Bulletin of the Seismological Society of America, 64 (5). pp. 1383-1388. ISSN 0037-1106.

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The Cagniard-de Hoop method is used to investigate elastic-wave tunneling through a thin high-velocity layer. The results indicate high-frequency attenuation in the geometric shadow zone. Attenuation is roughly proportional to layer thickness. Comparison of results obtained by omitting the high-velocity layer but using an average Q operator shows that effects of the high-velocity layer are similar to Q effects, with the equivalent Q for a given layer thickness varying as a function of source-receiver distance. These attenuation effects are explained in terms of deformation of the de Hoop contour.

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Additional Information:© 1974 Seismological Society of America. Manuscript received March 21, 1974. This research was supported by the Advanced Research Projects Agency of the Department of Defense and was monitored by the Air Force Office of Scientific Research under Contracts F44620-72-C-0078 and F44620-72-C-0083.
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Advanced Research Projects Agency (ARPA)UNSPECIFIED
Air Force Office of Scientific Research (AFOSR)F44620-72-C-0078
Air Force Office of Scientific Research (AFOSR)F44620-72-C-0083
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Caltech Division of Geological and Planetary Sciences2455
Issue or Number:5
Record Number:CaltechAUTHORS:20140902-153934113
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:49155
Deposited By: Tony Diaz
Deposited On:03 Sep 2014 16:26
Last Modified:03 Oct 2019 07:11

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