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. 2016 Dec 19;7:13863. doi: 10.1038/ncomms13863

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Copyright © 2016, The Author(s)

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(a) Map showing the low-frequency earthquake (LFE) band (outlined in blue). LFEs and active volcanoes are denoted by red dots and white triangles, respectively. Labels A–F mark locations of interest for LFE activity. Location A is used as the origin for the along-strike coordinate for the plots shown in Fig. 2. Names of the regions discussed in the text are also shown. Broken lines denote depth contours of the upper surface of the Philippine Sea slab with an interval of 10 km (refs ⁴³, ⁴⁴). (b) Map of P-wave velocity perturbations (dVp), (c) S-wave velocity perturbations (dVs), (d) Vp/Vs, and (e) P-wave attenuation (Q_p⁻¹) along a surface 3 km above the Philippine Sea slab. Velocity perturbations are deviations from an average velocity at each depth, and Vp/Vs and Q_p⁻¹ are shown in absolute values. LFEs are denoted by grey dots.