Complex crater

[1] Above a certain threshold size, which varies with planetary gravity, the collapse and modification of a transient cavity is much more extensive, and the resulting structure is called a complex crater.

The central uplift is not the result of elastic rebound, which is a process in which a material with elastic strength attempts to return to its original geometry; rather the uplift is a process in which a material with little or no strength attempts to return to a state of gravitational equilibrium.

[4] Diameters of craters where complex features form depends on the strength of gravity of the celestial body they occur on.

Stronger gravity, such as on Earth compared to the Moon, causes rim collapse in smaller diameter craters.

Lunar craters of diameter greater than about 175 kilometres (109 mi) may have complex, ring-shaped uplifts.