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Detailed Reference Information
Shearer 1991
Shearer, P.M. (1991). Imaging global body wave phases by stacking long-period seismograms. Journal of Geophysical Research 96: doi: 10.1029/91JB00421. issn: 0148-0227.

Stacked record sections combining over 5 years of long-period Global Digital Seismograph Network (GDSN) seismograms from shallow events show dozens of seismic body wave phases. Separate images are obtained for the vertical, radial and transverse components using a automatic gain control algorithm which normalizes the amplitude of each trace prior to stacking. These images provide an indication of the relative signal-to-noise characteristics of different parts of the GDSN data set. Core-mantle boundary diffracted phases are particularly prominent in these stacks, which show Pdiff to 150¿, PKPdiff to 200¿, PPdiff to 230¿, Sdiff to 160¿, and SSdiff to 220¿. High-order S surface multiples can be seen extending through the surface wave train up to ranges of 540¿. Two examples of possible upper mantle discontinuity reflected phases are visible, one following PPP between about 95¿ and 125¿, the other following ScS3 between about 210¿ and 240¿. An apparent offset between SH and SV arrivals is seen which becomes larger for the higher-order S multiples (SSS, SSSS, etc.), and appears consistent with models containing transverse isotropy in the upper mantle. ¿American Geophyiscal Union 1991

BACKGROUND DATA FILES

Abstract

Keywords
Seismology, Body wave propagation, Seismology, Core and mantle, Seismology, General or miscellaneous
Journal
Journal of Geophysical Research
http://www.agu.org/journals/jb/
Publisher
American Geophysical Union
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