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PP and crustal structure

Wu, Francis T. and Hannon, W. J. (1966) PP and crustal structure. Bulletin of the Seismological Society of America, 56 (3). pp. 733-747. ISSN 0037-1106.

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Haskell's formulation for reflection of P waves at the base of a solid crust is extended to include overlying liquid layers. Normalized displacement and the phase shift at the base of the crust as a function of angle of incidence and frequency are calculated for two continental models and an oceanic model. Complex reflection coefficients are inverse Fourier transformed to the time domain to show the change of pulse shape upon reflection. These time traces show that the water layer of the oceanic model causes the main difference between continental and oceanic reflections. Sample seismograms from a deep shock were compared to the theoretical records; they were found to be consistent. It is concluded that the amplitude ratio PP/P as a function of frequency obtained from seismograms can be used to decipher the detailed structure at the point of reflection only after the radiation pattern of the source, attenuation of waves during propagation, and crustal transmission response at the receiver are properly taken into account.

Item Type:Article
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URLURL TypeDescription
Wu, Francis T.0000-0003-4529-9862
Additional Information:Copyright © 1966, by the Seismological Society of America. Manuscript received September 28, 1965. This research was supported by the Advanced Research Projects Agency and was monitored by the Air Force Office of Scientific Research under Contract AF-49(638)-1337.
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Air Force Office of Scientific Research (AFOSR)AF-49(638)-1337
Advanced Research Projects Agency (ARPA)UNSPECIFIED
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Caltech Division of Geological Sciences1382
Issue or Number:3
Record Number:CaltechAUTHORS:20140801-152654578
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:47843
Deposited By: George Porter
Deposited On:01 Aug 2014 22:35
Last Modified:09 Mar 2020 13:19

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