《Table S1.Focal mechanisms (g CMT) of earthquakes used in this study》

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《Seismic detection of the X-discontinuity beneath the Ryukyu subduction zone from the SdP conversion phase》

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Notes:The components of moment tensors in RTP coordinate are shown as Mrr，Mtt，Mpp，Mrt，Mrp，and Mtp.

We collected data from the intermediate-depth earthquakes that occurred from 2005 to 2017 beneath the Ryukyu subduction zone.Because our goal was to detect the X-discontinuity around 300km，we chose earthquakes with focal depth range between 130and 220 km，in order to avoid the interference of direct P and p P phases on the weak Sd P.Furthermore，we chose only earthquakes with simple source time series and source duration less than 5.0 s，because complicated source time functions may cause a misreading of the multiple phase（Zhou YZ et al.，2012）；event magnitudes should be strong enough that observed seismograms would have clear P and p P phases.Finally，five intermediate-depth events were selected（Figure 1b）.The basic source parameters of Ev.1–5（Table 1）are taken from the well-accepted Preliminary Determinations of Epicenters（PDE）Catalog of USGS（http://earthquake.usgs.gov/data/pde.php/）.The focal mechanism solutions are taken from the global Centroid-Moment-Tensor Project（g CMT，http://www.globalcmt.org/）（Table S1） .