Hydraulic fracturing a subterranean formation with frac fluid, the hydraulic fracturing including complex shear fracturing of the subterranean formation. The technique includes determining an amount of the complex shear fracturing occurring, and adjusting operating parameters of the hydraulic fracturing to increase the complex shear fracturing occurring. The amount may consider fracture surface area. The adjusting may consider resonant frequency of the subterranean formation rock being fractured. The complex shear fracturing may assist with diffusion production. The techniques may include a non-transitory, computer-readable medium having instructions executable by a processor of a computing device to facilitate the aforementioned actions.