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Detection of underside P reflections at mantle discontinuities by stacking broadband data
Author(s) -
Wajeman Nathalie
Publication year - 1988
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/gl015i007p00669
Subject(s) - classification of discontinuities , seismogram , geology , seismology , broadband , stacking , amplitude , mantle (geology) , geodesy , seismic array , geophysics , physics , optics , nuclear magnetic resonance , mathematical analysis , mathematics
Underside P‐reflections at mantle discontinuities are difficult to observe directly on seismograms mainly because of their low amplitude. It is shown that stacking seismograms obtained at several epicentral distances but having their PP bounce points in the same region, enables the identification of such phases. This method is applied to data from Japanese and Taïwan events recorded by the NARS array and other broadband European stations; discontinuities at about 670 and 300 km are revealed beneath Northern Eurasia.