Supporting Data for Chaves et al. (2026): Impact of mantle velocity uncertainty on receiver-function imaging of the transition zone

This repository contains the data products and codes used in the study “Impact of mantle velocity uncertainty on receiver-function imaging of the transition zone,” submitted to Geophysical Research Letters. The repository includes codes for simulations using two global mantle tomography models: S40RTS (Ritsema et al., 2011) and GLAD-M35 (Cui et al., 2024). Together with the provided archive CMTFILES_RF_SIMULATIONS.tar.bz2, the packagesspecfem3d_globe7_GLADM35S_GLADM35P_nocrust_stations_1x1_RF_8s_01.tar.bz2 andspecfem3d_globe7_S40RTS_nocrust_stations_1x1_RF_8s_01.tar.bz2are preconfigured to generate the synthetic seismograms used for the receiver-function analysis. The file with our array of stations (STATIONS) is already in the code files, within the folder DATA. These synthetic seismograms are used to evaluate how uncertainties in mantle seismic velocities affect imaging of the 400-km and 670-km discontinuities in the mantle transition zone. The script script_processing.csh documents all processing parameters applied to the synthetic waveforms and reproduces the figures presented in the manuscript. Output parameters The tables within the files TABLES_S40RTS.tar.bz2 and TABLES_GLADM35.tar.bz2 were generated by the script script_processing.csh and contain the following header and parameters: cp_lat (degree) – Latitude of the cap center cp_lon (degree) – Longitude of the cap center cp_rad (degree) – Radius of the cap P–P400s (s) – Time difference between the P arrival (centered at 0 s) and the P400s phase, picked at maximum amplitude T_ref_P–P400s (s) – Reference P–P400s time at an epicentral distance of 67° dt_P–P400s (s) – Travel-time residual (P–P400s minus T_ref_P–P400s) A_P400s / A_P – Amplitude ratio between P400s and P P–P670s (s) – Time difference between the P arrival (centered at 0 s) and the P670s phase, picked at maximum amplitude T_ref_P–P670s (s) – Reference P–P670s time at an epicentral distance of 67° dt_P–P670s (s) – Travel-time residual (P–P670s minus T_ref_P–P670s) A_P670s / A_P – Amplitude ratio between P670s and P depth_400 (km) – Depth of the 400-km discontinuity inferred from P–P400s delta_depth_P400 (km) – Deviation from the nominal 400-km depth depth_670 (km) – Depth of the 670-km discontinuity inferred from P–P670s delta_depth_P670 (km) – Deviation from the nominal 670-km depth