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Fig. 2 | Earth, Planets and Space

Fig. 2

From: Sequence of deep-focus earthquakes beneath the Bonin Islands identified by the NIED nationwide dense seismic networks Hi-net and F-net

Fig. 2

High-frequency seismic propagation across Japan. a Vertical velocity seismograms observed at the Hi-net stations along coastal areas of Honshu and Hokkaido, and b example three-component vector mean square (MS) envelope at N.JUOH. Amplitudes in a were normalized by the maximum amplitudes of each trace. Stations used in the trace and MS envelope are shown in the right subfigure of a. The trace and station location of N.JUOH are represented by blue lines and a blue symbol. Purple and black traces are velocity seismograms for low (0.02–0.05 Hz) and high (1–32 Hz) frequencies, respectively. Red and green solid lines are theoretical traveltimes obtained using TauP (Crotwell et al. 1999) assuming the ak135 model (Kennett et al. 1995). Dashed lines are shifted parallel from solid lines. Linear and logarithmic scale plots of the MS envelope are illustrated in the upper and lower panels of b, respectively

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