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Long-period body-wave propagation from 4° to 13°

Helmberger, Donald V. (1972) Long-period body-wave propagation from 4° to 13°. Bulletin of the Seismological Society of America, 62 (1). pp. 325-341. ISSN 0037-1106.

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Numerical seismograms are computed for a compressional pulse in a layered model. The simpler models consist of a fluid layer over a fluid half-space, a fluid layer over a solid half-space, and a solid layer over a solid half-space. Restricted portions of the theoretical response for a layered model approximating the Earth are constructed. Synthetic seismograms are generated using the pressure pulse appropriate for NTS events and the long-period instrument response. The interplay between the PL wave, the refracted wave along the lid, and the arrival from the base of the low-velocity zone is displayed. A detailed comparison between the synthetics and observations indicates a prominent low-velocity zone with appreciable seismic absorption. Observed regional wave-shape characteristics are displayed and a reconnaissance map of lateral variations along the top of the mantle presented.

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Additional Information:Copyright © 1972, by the Seismological Society of America. Manuscript received July 14, 1971. I thank Drs. Freeman Gilbert and David Harkrider for their advice and constructive criticism. This research was supported by the Air Force Office of Scientific Research, under Contract AFOSR (F44620-69-C-0067).
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Air Force Office of Scientific Research (AFOSR)F44620-69-C-0067
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Caltech Division of Geological Sciences2045
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48424
Deposited By: George Porter
Deposited On:12 Aug 2014 22:38
Last Modified:03 Oct 2019 07:03

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