Seismic data from 126 permanent seismic stations run by the China Earthquake Administration between 2009 and 2015 were processed. Teleseismic waveform recordings with a magnitude greater than M6.0 and epicentral distances ranging from 30° to 90° were considered. The back azimuth coverage of these events is overall adequate for anisotropy analysis . The RFs were computed following the source equalization procedure with a water-level parameter of 0.001 and a Gaussian width of 2.5. We manually evaluated these receiver functions by checking the Ps signals, and high-quality radial and transverse RFs were selected for further processing.