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Earth, Planets and Space
Figure 1 | Earth, Planets and Space

Figure 1

From: Velocity increase in the uppermost oceanic crust of subducting Philippine Sea plate beneath the Kanto region due to dehydration inferred from high-frequency trapped P waves

Figure 1

Map of the Kanto-Tokai region and vertical velocity seismograms. (a) Distribution of the Hi-net (Okada et al. 2004). (b) Vertical velocity seismograms recorded at the Hi-net stations (black filled squares) during event 5 (black focal sphere). (c, d) Vertical velocity seismograms during two other events. The isodepth lines of the upper surface of the Philippine Sea plate (Hirose et al. 2008a) are shown for 10 km intervals in (a). Arrow in (a) shows the direction of the Philippine Sea plate motion (Seno et al. 1993). The trapped signals are clearly observed in the region inside shaded area (Hori 1990, 2006). Line A-A′ represents the area of the 2D simulation in the x direction and the region inside the dotted rectangle in (a) is the area of the 3D simulation in the horizontal direction. The amplitude of each trace was normalized to its maximum amplitude. The gray dashed and solid lines in each trace are the onsets of the P and trapped P waves, respectively.

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