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Earth, Planets and Space
Fig. 1 | Earth, Planets and Space

Fig. 1

From: Variations in seismic velocity distribution along the Ryukyu (Nansei-Shoto) Trench subduction zone at the northwestern end of the Philippine Sea plate

Fig. 1

Tectonic maps and locations of seismic lines. The characteristic seafloor topography of the Philippine Sea plate on the left and the position of the seismic lines (red and green lines) across and along the Ryukyu (Nansei-Shoto) arc on the right. The rough position of the volcanic front is shown in red dotted line. Three thin violet lines are previous seismic lines across the northernmost Ryukyu Trench (Nishizawa et al. 2009). A non-tuned airgun array with a capacity of 6000 (1500 × 4) cubic inch (98.3 L) was shot for the refraction survey and a 1050 (350 × 3) cubic inch (17.2 L) airgun cluster was used for the multichannel reflection survey. Broken lines indicate iso-depth contours of the plate interface with an interval of 10 km (Hayes et al. 2012). MJ Miyako-jima, IJ Ishigaki-jima, BMFZ Botan-Miyako fracture zone, OH Oki-Hateruma Basin

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