THEMIS Image of the Day, December 12, 2018. Located in Noachis Terra, Asimov Crater has an unusual crater floor morphology.
At some point after the crater formed, the interior was filled by materials that reached almost to the top of the crater rim. At some later point, deep depressions formed along the inner crater rim. Channels dissect both sides of these depressions.
The mechanism of both the filling of the crater and the formation of the depressions is not known. Two other nearby craters also have filled floors and interior depressions. This VIS image shows the southwestern section of the interior depression.