This dataset contains raw, processed and inverted data for 2 hydraulic fracturing tests performed in a Zimbabwe gabbro (GABB-002) and a Carrara Marble (MARB-007) at the Geo-Energy lab @ EPFL. [IMPORTANT NOTE: DUE TO file size-constraint, the raw binary filed containing the acoustic data is not part of this zenodo data set - Please contact Prof. B. Lecampion directly if you are interested in playing with the raw acoustic data file] TEST ID - GABB-002 : Lag/viscosity dominated test in a gabbro TEST ID - MARB-007 : Lag/viscosity dominated test in a carrara Marble The details of these two tests and its analysis is described in details in the following publication: Measurements of the evolution of the fluid lag in laboratory hydraulic fracture experiments in rocks Dong Liu, Brice Lecampion Geo-Energy Laboratory, Gaznat Chair on Geo-Energy, Ecole Polytechique Fédérale de Lausanne, EPFL-ENAC-IIC-GEL, Lausanne, Switzerland