Journal: Scientific Reports

Article Title: Seismic evidence for flow in the hydrated mantle wedge of the Ryukyu subduction zone

doi: 10.1038/srep29981

Figure Lengend Snippet: ( a ) Model 1 . Strongly foliated antigorite domain (purple) parallel to the subduction boundary. We used 3-D ray paths as shown in , but for the purposes of illustration, seismic stations, seismic sources and tele- and local- seismic ray paths are projected onto the X1–X3 plane based on refs , , . These are denoted by open triangle, brown spheres and red and blue dotted lines, respectively. The orange arrows denote observed fast directions. The Vs 1 polarizations figure (3-D distribution of the polarization direction of the fast S-wave passing through various directions) with color shading for AVs (the polarization anisotropy of S-waves owing to shear wave splitting, 200(Vs 1 − Vs 2 )/(Vs 1 + Vs 2 ) ) was prepared using software that combined the two MATLAB toolkits, MTEX and MSAT and incorporated an antigorite CPO from ref. . ( b ) The relationship between averaged delay times (vertical axis) and fast direction azimuths (horizontal axis) for observed data in black with 95% CL in gray and model results in purple. Squares, rhombi and triangles denote the results for tele-, local- and combined seismic phases obtained from both AMM and TAS seismic stations, respectively. Inverted triangles and circles denote the results for combined seismic phases for each AMM and TAS seismic stations, respectively. This calculation includes an assumed crustal anisotropy of 0.3 s with trench-parallel splitting .

Article Snippet: For our model calculations of S-wave splitting, we used an approach that combines two recently developed Matlab toolkits: MTEX and MSAT .

Techniques: Shear, Software