This PDF file includes:

• Supplementary Text
• Mantle wedge seismicity in other subduction zones
• Episodicity of mantle wedge earthquakes and velocity of fluid migration
• Fig. S1. Along-trench profiles of mantle wedge seismicity and P-velocity structure, plotted as seen from the trench.
• Fig. S2. Temporal evolution of seismicity in the Tripoli cluster.
• Fig. S3. P-velocity to S-velocity (V_p/V_s) ratio structure beneath western Greece.
• Fig. S4. Focal mechanisms of the Tripoli cluster.
• Fig. S5. Estimates of completeness magnitude, M_c, for various catalogs of deep earthquakes (>35 km) below western Greece.
• Fig. S6. Comparison of seismic images and calculated seismic structure along the cross section of Fig. 1D.
• Fig. S7. Hypocenters displayed with their relative location errors.
• Fig. S8. Earthquake distribution and electric resistivity structure below the Peloponnese.
• Table S1. Seismograph networks from western Greece used in the waveform processing.
• Table S2. Focal mechanism solutions of deep earthquakes in the Western Hellenic subduction zone.
• Table S3. Locations of mantle wedge seismicity displayed in cross sections in Fig. 4.
• External Data file S1. Deep earthquake hypocenters in Greece.
• External Data file S2. Deep earthquake focal mechanisms in Greece.
• External Data file S3. Earthquake arrival time picks.
• External Data file S4. Model of the subduction plate interface.
• External Data file S5. Thermal structure model of the subduction zone.
• References (59–81)

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