Cracks were spreading
The eruption of the Dabbahu volcano caused a fracture in the tectonic plates in the area. During the eruption, magma was able to get in between the plates. As a result, the tectonic plates were pulled apart and this created cracks on the surface.
Source: Amusing Planet
Months after the volcanic eruption, more cracks have appeared across the area. It has been discovered that dozens more have formed in the southern part of Ethiopia. They were slowly spreading and each new crack widened up within days and weeks.