Open AccessTHEORETICAL AMPLITUDES OF THE SEISMIC PHASE PKJKP
Author(s) -
Bullen K. È.
Publication year - 1951
Publication title -
geophysical journal international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0956-540X
DOI - 10.1111/j.1365-246x.1951.tb06275.x
Subject(s) - seismogram , amplitude , geology , seismology , compressibility , rigidity (electromagnetism) , range (aeronautics) , phase (matter) , boundary (topology) , seismic wave , inner core , geophysics , geodesy , physics , mechanics , mathematics , optics , mathematical analysis , materials science , quantum mechanics , composite material
Summary Calculations have been made of the partitioning of energy of P waves incident from above against the boundary of the Earth's inner core, and of P and SV waves incident against this boundary from below. In these calculations the inner core has been assumed to have rigidity as in an Earth model based on compressibility theory. The calculations have been applied to estimating the relative amplitudes of the phases PKJKP and PKIKP at various epicentral distances for a given earthquake. It is shown that, on the assumptions made, the phase PKJKP is most likely to be observed over a range 130°≫Δ≫ 155° of epicentral distance, the amplitude in this range being about one‐fifth of that for PKIKP . It is suggested that readers of seismograms who find PKIKP strongly recorded in this range might also look for the phase PKJKP ; the writer of this paper would much appreciate it if observational evidence supporting the existence of the phase PKJKP could be communicated to him for purposes of collation.