HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) References 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 BUCHBINDER, G. G. R. Search for Related Content GeoRef GeoRef Citation

Diffraction from the PKP caustic B

SEISMOLOGY DIVISION EARTH PHYSICS BRANCH DEPARTMENT OF ENERGY, MINES, AND RESOURCES, OTTAWA, ONTARIO, Canada KIA OE4

Abstract

Long-period energy preceding the PKP_DF branch on long-period seismograms was identified as resulting from diffraction from the PKP caustic B. This conclusion is based on the measurements of the travel times, and, therefore, the slope of the travel times, on the amplitude decrease, and the very rapid dispersion of the periods of one earthquake of intermediate focal depth. Data from three deepfocus earthquakes support this interpretation. Thus, the long-period precursors are not due to the same cause as short-period precursors and are not produced by discontinuities in the transition zone between the inner and outer cores nor by structure in the inner core.

This article has been cited by other articles:

				L. Wen and D. V. Helmberger Ultra-Low Velocity Zones Near the Core-Mantle Boundary from Broadband PKP Precursors Science, March 13, 1998; 279(5357): 1701 - 1703. [Abstract] [Full Text]

				J. Schlittenhardt Array analysis of core-phase caustic signals from underground nuclear explosions: Discrimination of closely spaced explosions Bulletin of the Seismological Society of America, February 1, 1996; 86(1A): 159 - 171. [Abstract] [PDF]

				C. WRIGHT The origin of short-period precursors to PKP Bulletin of the Seismological Society of America, June 1, 1975; 65(3): 765 - 786. [Abstract] [PDF]