Open AccessA Comparison of Leaking Modes and Generalized Ray Theory
Author(s) -
Dainty Anton M.,
Dampney C. N. G.
Publication year - 1972
Publication title -
geophysical journal of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.302
H-Index - 168
eISSN - 1365-246X
pISSN - 0016-8009
DOI - 10.1111/j.1365-246x.1972.tb06119.x
Subject(s) - seismogram , computation , synthetic seismogram , range (aeronautics) , geology , mathematical analysis , geometry , seismology , physics , mathematics , algorithm , materials science , composite material
Summary Synthetic seismograms have been computed and compared using leaking modes and generalized ray theory. The comparison was carried out for a single‐layer model with a strong velocity contrast at intermediate distance (25 times the layer thickness). Low frequencies only were considered; two leaking modes (P̄(+, −) and P̄(−, +)) and 340 rays were used in the computations. Good agreement was obtained and the build‐up of oscillatory seismograms for the ray theory by successively higher orders of reflected head waves was observed. This success suggests that a complete range of synthetic seismograms for a layered half‐space from vertical reflections (zero source‐receiver separation) through the critical distances to normal mode seismograms (large source‐receiver separation) may be computed using theoretical techniques now available, including the two used here. A brief review of the theory of both methods is given.