Active seismic characterization experiments of the Hontomín research facility for geological storage of CO2, Spain

► We introduce the active seismic reflection experiments carried out in Hontomín. ► The 3D architecture of the CO2 storage site is imaged and a baseline is generated. ► The target structure is a marine carbonate asymmetric dome. ► The fault and the reservoir-seal system are fully characterized. ► We propose the most suitable location for injection and monitoring boreholes.