Multi-ring basins
The largest impact craters form small basins containing a series of multiple concentric ridges, and they seem to come in two basic types. The classic basin is Orientale on the Moon, which features at least five circular rings that form inward-facing scarps up to 6 km high. The second type is the Valhalla structure on the Jovian moon Callisto. This multi-ring basin consists of a bright central patch surrounded by a system of concentric ridges. These ridges are surrounded by dozens of grabens that may extend thousands of kilometers from the impact point. On Earth, the 65 Ma, 180 km diameter Chicxulub crater in Mexico is one of the few examples positively identified as a multi-ring basin. These basins are thought to form as a tectonic response of the target’s lithosphere the the crater formed by the impact, and indicates the presence of a low-viscosity or low-strength layer below the surface. The transition between peak or peak ring craters and rimmed basins on different bodies does not relate to the surface gravity of the body, but seems to depend a great deal on the rheological properties near the surface, in particular the presence of a weak subsurface layer which can flow on the timescale of the crater collapse. However, the formation of these basins is still not very well understood.
OUGS
Ridges and concentric rings - how are these formed? Scientists always use the "water drop and ripples" to explain it but a meteorite hitting a planet is not a drop of fluid hitting more fluid. These Meteorites are meant to be of varied material (remember the dirty snow ball idea?) hitting at different speeds at different times of the planets history yet make similar impacts...
Maybe what created all the craters is the same force and that is why the actual planet has little to do with the result. The planet will effect it but mainly with its "G".
If it was an EDM (Spark Machining) event then that would help to explain
crater chains.
And if it created craters then what else would a very large electrical spark create?
The earth as a lightning strike victim (The Grand Canyon) and also a human struck by a lightning bolt