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The delay time of a converted phase from a direct P wave corresponds to the depth of the velocity interface where the converted phase was generated.
Large differences, particularly in the time lag before the arrival of the P-to-S converted phate athehe Moho discontinuity, were observed.
The converted phase is due to a sharp velocity decrease that occurs at variable depth across the study region.
A similar southward shift of the main focusing position is observed for another converted phase PPS (Fig. 11).
At 200 240 km within AA′, 150 200 km within BB′ and 100 120 km within CC′, the negative multiples (PsPs + PpSs) merge with the converted phase, broadening the phase due to the velocity decrease.
Similar(55)
Example of PS converted phases observed at station 1 (Figure A2). Figure A2.
We introduced station correction terms based on PS converted phases following the methods of previous OBS studies (Hino et al. 2000).
The positive phases in the radial RFs, shown with blue color in Fig. 2 are converted phases at a velocity interface where the deeper media is faster than the shallower media.
In this study, we investigated the crust and upper mantle anisotropy by shear wave splitting of P-to-S convereceiverses on receiver functions and SKS phases on both broadband and short period seismograms in the central Alborz region of Iran.
With the use of the conventional sponge absorbing boundary, artificial reflections from the edge of the model at both sides of the plane wave make it difficult to recognize later arrivals of reflected and converted phases (Fig. 15a).
Because the Ps converted phases at the Moho discontinuity arrived around 4 s after the direct P wave, we assume that the dissimilarity is caused by a localized structural anomaly in the crust.
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