Then and Now, Changes over time Options

[MizarKey]

Of course we've seen similar side by side images showing the changes between the years. I never get tired of them...

Here's a couple...from 06/05/2000 M1600291 12.02m/pixel and 08/16/2005 S0901626 3.21m/pixel

I rotated M1600291 so it would line up with S0901626. I didn't really scale them efficiently, M1600291 appears at 2x while S0901626 appears at 0.5x

You can see that a couple of the 'seeps' (dust slides or whatever) are new. The other section I enlarge 2x from S0901626 I thought interesting as the 'dust' passed over two outcroppings but only made them slightly darker while the rest of the trail is quite a bit darker...I would think the darkness would be more uniform...maybe the dust didn't stick to the outcrop so much?

Attached thumbnail(s)

 

[Phil Stooke]

The moving dust isn't dark. It's the material underneath the bright surface layer of dust that is dark. The streak is a place where the bright dust has been disturbed.

Phil

[MizarKey]

Is wind the proposed mechanism for the disturbance? Or some kind of dust avalanche that mimicks fluid movement?
I know it's considered 'looney' to think this may be some liquid based phenomenon, but based on the current level of evidence detail available, a flowing liquid (dirty brine, slush or whatever) fits the observations too. These trails are distinctly different than what we see in the dust devil trails, though I've yet to see a dust devil trail and one of these within the same crater or hillside.
My point being that I don't think anyone can authoritatively state that what we're observing is precisely one thing or another (action of dust or liquid). Of course I'm not as well read as some of the members here, so if there are scientifically authored papers on this I'd love to read them.
And please note I did not mention the H2O word once.