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Earth, Planets and Space
Fig. 4 | Earth, Planets and Space

Fig. 4

From: Seismic evidence for arc segmentation, active magmatic intrusions and syn-rift fault system in the northern Ryukyu volcanic arc

Fig. 4

Seismic reflection image of the RK02 profile focusing on the Tokara Channel. The acoustic basement marked by high-amplitude reflections forms a ~ 30-km-wide bowl-shaped basin with the maximum depth of ~ 2 s two-way travel time (equivalent to ~ 3 km) relative to the adjacent non-volcanic arc segment. The basin is filled with subhorizontal reflectors indicative of sedimentary units deposited on the arc crust. The sedimentary layers show a downward convex geometry and step-like features across the layers as indicated by black arrows. The acoustic basement also exhibits multiple steps in the southeastern part of the basin

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