Fig. 3: Bidirectional and radial crack growth models.
From: Modelling of earthquake swarms suggests magmatic fluids in the upper crust beneath the Eger Rift
a Bidirectional crack growth by fluid injection with high overpressure and buoyancy, and b radial growth under low overpressure and buoyancy, leading to hydro-shearing in the tip region of the penny-shaped crack. For a simplified analysis, cracks are replaced by theoretical models with constant half-width h. Crack growth is considered quasi-static, where the crack size is associated with the fluid or pressure front, respectively.
