Discrete Element Analysis of Strike-Slip Surface Fault Rupture

The discrete element method (DEM) is widely used in the fields of structural geology and tectonophysics to simulate the formation of fault-induced geologic features. With few exceptions, the vast majority of these simulations have focused on dip-slip fault rupture, with few exceptions of strike-slip fault rupture. Strike-slip fault rupture is particularly difficult to model with DEM, because 3D models often require millions of individual grains to capture the finest details of developing shear zones. Fortunately, high-performance computing makes this entirely possible. This study utilizes high-performance computing with DEM to simulate strike-slip fault rupture in dense and loose analogue soils. The results of the shear zones that develop during rupture are analyzed in plain view from above and from the side view to develop a comprehensive comparison with features observed in nature through post-earthquake reconnaissance activities.