Quick Search:    advanced search

GSW Home   GeoRef Home   My GSW Alerts   Contact GSW   About GSW   Journals List   Help

This Article Full Text (PDF) References Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via Google Scholar Google Scholar Articles by HELMBERGER, D. V. Search for Related Content GeoRef GeoRef Citation

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

SEISMOLOGICAL LABORATORY CALIFORNIA INSTITUTE OF TECHNOLOGY, PASADENA, CALIFORNIA
DIVISION OF GEOLOGICAL SCIENCES

Abstract

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.

This article has been cited by other articles:

				R. L. Christiansen, G.R. Foulger, and J. R. Evans Upper-mantle origin of the Yellowstone hotspot Geological Society of America Bulletin, October 1, 2002; 114(10): 1245 - 1256. [Abstract] [Full Text] [PDF]

				P. W. POMEROY, W. J. BEST, and T. V. MCEVILLY Test ban treaty verification with regional data--A review Bulletin of the Seismological Society of America, December 1, 1982; 72(6B): S89 - S129. [Abstract] [PDF]

				C. A. LANGSTON Aspects of Pn and Pg propagation at regional distances Bulletin of the Seismological Society of America, April 1, 1982; 72(2): 457 - 471. [Abstract] [PDF]

				D. V. HELMBERGER and G. R. ENGEN Modeling the long-period body waves from shallow earthquakes at regional ranges Bulletin of the Seismological Society of America, October 1, 1980; 70(5): 1699 - 1714. [Abstract] [PDF]