Out of Round Crater

Today's VIS image shows part of an unnamed crater located in Terra Sirenum. While the crater in this VIS image was crated by an impact event, the resultant form is not the normal circular shape. There are several factors that can create 'out of round' craters. The most common is subsurface faulting from tectonic activity. Pre-existing subsurface fractures can deflect impact pressures along the fault faces, rather than uniformly radially from the center of impact. Meteor Crater in Arizona has "corners" due to the same tectonic forcing of impact pressures. Not only is the shape of this crater odd, but just how the ridge on the floor formed is unknown.