Seismic tomography was applied to estimate subsurface structures West Sumatera. Based on anomalies of P- dan S-wave velocity (Vp and Vs) and Vp-Vs ratio. Earthquake data were downloaded from ISC (International Seismological Center) website from January 1, 1900 to August 31, 2021. Earthquake events with a minimum of 3 phase were selected for tomography input. Seismic velocity models and source p…