Crater Chains again – and this time they’re fuzzy
Around many large craters, smaller secondary craters can be found caused by falling debris from the main crater forming process. Secondary craters can appear in clumps, sometimes in a herringbone pattern, or more unusually in a line – a crater chain. We haven’t found many crater chains in Moon Zoo. This is probably because they tend to be large features and best spotted using a wide view. Some chains have distinct separate craters while others look indistinct and decidedly fuzzy. Using the ACT-REACT Quick Tool forum regular kodemunkey found a great example of a fuzzy crater chain north of Mare Orientale.
The fuzzy “landslide” effect is due to fragments of debris from the originating impact landing one after the other very close together in a line. The impacts and ejecta have interfered with each other resulting in a string of wispy densely-spaced secondary craters.
A closer look at ACT-REACT shows that the terrain slopes upwards from left to right and that the chain is just over 1km long. The elevation graph shows the expected dips where the debris has impacted.
So where is the parent crater? Secondary craters fall radially to the original impact and up to hundreds of kilometres away. I think the most likely candidate is an unnamed fresh white crater 100 km away.
We have featured crater chains before as Image of the Week. They are fairly illusive but make striking images when you find one. And if you do find one, whether distinct or fuzzy, don’t forget to post it on the forum thread.
Previous Crater Chain Images of the Week: