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imported_Frank
2012-May-09, 07:09 AM
Nifty four element crater chain in the lower center of this image.

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IreneAnt
2012-May-11, 05:18 PM
Yes! Nice find Frank.

imported_Frank
2012-May-15, 05:44 PM
This one looks like a small chain. ::shrugs

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IreneAnt
2012-May-17, 05:24 PM
This one looks like a small chain. ::shrugs

50

Hmmm. That one is harder to say. Our eyes are very good at picking out patterns. So goo that we often make patterns where there aren't any. Three craters is few enough that we could just be seeing a random arrangement of craters that are close to a line. We would really need one or two more craters in the line to be sure it isn't just a fluke.

Keep hunting!

JimNumn
2012-Jul-26, 02:02 PM
So, 3 craters can be a chain.

Does the chain have to be straight? I see a lot of "chains" that wander around, or that circle part of the rim of another crater. Are the irregular chains volcanic or subsidence, rather than impacts?

Should we mark chains if the craters do not meet the minimum size for an individual crater?

Is there any special way to mark really long chains? Multiple flags?

When there is a track of a boulder rolling down a crater wall, should we mark that as a crater chain?

Thanks!

IreneAnt
2012-Jul-26, 07:43 PM
Hi JimNumn

Generally, impact crater chains form straight lines. They don't meander or circle around another crater. If they do, they are not an impact crater chain.

Volcanic crater chains look very different from impact crater chains. First the craters are different; more irregularly shaped. Chains of volcanic craters can form curved lines, but if they circle the rim of another crater, they wouldn't be called a chain any more. Volcanic craters are fairly rare on the Moon, so volcanic crater chains are even less common.

Chains of pit craters, caused by collapse or subsidence of an unsupported chill crust can be less predictable, but they are not usually associated with any kind of larger crater. Pit craters are also quite rare on the Moon.

If you do find a chain of craters (impact, volcanic, or pit), you should definitely mark them, even if the individual craters are smaller than the minimum size (though it will probably be very rare for that to be the case). If a chain is very long, it may be helpful to use two or three flags to mark it.

The track from a boulder that rolled down a crater wall is a "boulder track" and not a crater chain, so it should not be marked as a crater chain.

I hope this addresses all of your questions. Do not hesitate to ask for more info if anything is unclear.

Happy crater hunting!

cestmarrant
2013-Oct-03, 12:27 AM
when i click on the attchment links in these posts, it get a message that says it's invalid.

tusenfem
2013-Oct-03, 06:45 AM
when i click on the attchment links in these posts, it get a message that says it's invalid.


Dear cestmarrant, I think this is still connected to some problems we had with the forum software.
I have reported your post, so that the experts can take a look at the why and how.

galacsi
2013-Oct-03, 08:56 AM
Dear cestmarrant, I think this is still connected to some problems we had with the forum software.
I have reported your post, so that the experts can take a look at the why and how.


To add some details ,this is what I got :

18612

Et c'est pas marrant !

stu
2013-Oct-10, 07:39 PM
I think this relates to problems with the forum merger back in July, all the CQ attachments at that time were lost or some such thing. I've not been able to view any of them, anyway.

abubah
2013-Nov-26, 03:19 AM
Link not working ;/

HunterJonson
2015-Nov-30, 02:24 PM
Link not working ;/ - true

DaveC426913
2015-Dec-01, 03:45 AM
This thread is 2 years old.

Kevin
2017-Jun-28, 09:55 PM
Yes, understandable but I still want to see the working/active version of the images based on feedback and excitement level of others

DaveC426913
2017-Jun-29, 07:34 PM
This thread is 5 years old.