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Earth, Planets and Space
Fig. 5 | Earth, Planets and Space

Fig. 5

From: Examination of one-dimensional S-wave velocity structure using strong-motion data for high-seismic-intensity area during the 2018 Hokkaido Eastern Iburi earthquake

Fig. 5

PWS ACFs for each back azimuth. The top panels show the PWS ACF at each back azimuth. The blue and red indicate trough and peak, respectively. The PWS ACFs were calculated when there were more than five records within ± 10 degrees. The two panels show, from top to bottom, the number of events used for PWS ACF (magenta), and the arctangent of the ratio of epicenter distance to hypocenter depth (blue). Solid lines represent mean values and dashed lines represent ± one standard deviation from the average. NW, N, NE, E, SE, S and SW indicate northwest, north, northeast, east, southeast, south, and southwest, respectively

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