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Fig. 4 | Earth, Planets and Space

Fig. 4

From: Influence of low-velocity superficial layer on long-period basin-induced surface waves in eastern Osaka basin

Fig. 4

Surface wave propagation – semblance analysis. The left upper panel shows the band-passed synthetics (0.2–0.38 Hz) used for the semblance for model Vsmin250 at particular station of arrays ISK, YAE, MKT, OSA, and WOS. The black bar shows identified SL1’ surface wave. The right panel shows the time series of the slowness vectors (in black) with detected slowness in m/s (from semblance technique). The corresponding polarization azimuths are represented by the red sticks. The bottom panels are snapshots of total horizontal component of the simulated wave field (0.05–0.4 Hz). The SL1’ surface wave arriving at MKT (~ 34.8 s, left bottom panel) and at WOS (~ 52.6 s, mid bottom panel) is succeeded by another surface waves group. That results in change of apparent wave propagation direction from WNW to NNW at WOS at about 57 s when (after 58 s) it depicts a wave group propagating in the NNW direction. The lines originating at each of the stations show apparent slowness vector at respective times

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