Strange features in Martian craters in Tharsis.

Robert Clark

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Mar 26, 2001, 6:15:32 AM3/26/01

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What explains the ridges seen on the rims of many of the craters in this
image:

Sample typical east Tharsis plains
http://ida.wr.usgs.gov/html/m03017/m0301739.html

Bob Clark

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G. Orme

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Mar 26, 2001, 8:43:58 AM3/26/01

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G. Any ideas yourself?

""Robert Clark"" <rgc...@my-deja.com> wrote in message
news:000701c0b5e7$0cdc2240$10080940@default...

Antti Luode

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Mar 26, 2001, 11:22:40 AM3/26/01

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Again, we need a spy satellite above Mars.. And we need it now.. Now that
Nima is into Mars pictures.. Maybe they could spare one.. Lets modify it a
bit and sit it on a booster and launch it away...

Antti

"G. Orme" <ano...@marsattack.com> kirjoitti viestissä
news:yIHv6.26062$992.1...@news-server.bigpond.net.au...

Robert Clark

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Mar 26, 2001, 12:40:47 PM3/26/01

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I don't know but I looked at this area because it appears in the recent
PNAS paper on liquid water on Mars as an area where water might be stable on
Mars for perhaps 34% of the time:

Use of spacecraft data to derive regions on Mars where liquid water would be
stable
Proc. Natl. Acad. Sci. USA, Vol. 98, Issue 5, 2132-2137, February 27, 2001
http://www.pnas.org/cgi/content/full/98/5/2132

Fig. 4 shows a diagram of areas where liquid water might be stable:

http://www.pnas.org/cgi/content/full/98/5/2132/F4

In the image m0301739 there are some ridges in the channel as well:

http://ida.wr.usgs.gov/fullres/divided/m03017/m0301739a.jpg

Some also appear inside the craters:

http://ida.wr.usgs.gov/fullres/divided/m03017/m0301739d.jpg

Bob Clark

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Newsgroups: sci.astro,sci.geo.geology
From: "G. Orme" <ano...@marsattack.com>
Subject: Re: Strange features in Martian craters in Tharsis.
Date: Mon, 26 Mar 2001 13:43:58 GMT
Organization: BigPond Internet Services (http://www.bigpond.net.au)

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G. Any ideas yourself?

""Robert Clark"" <rgc...@my-deja.com> wrote in message

000701c0b5e7$0cdc2240$10080940@default">news:000701c0b5e7$0cdc2240$10080940@

David Ramalho

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Mar 26, 2001, 7:02:04 PM3/26/01

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Robert Clark wrote:
>
> What explains the ridges seen on the rims of many of the craters in this
> image:
>
> Sample typical east Tharsis plains
> http://ida.wr.usgs.gov/html/m03017/m0301739.html

Didn't you read the caution at the top of the page?

<Quote>
THE BROWSE AND JPEG IMAGES ARE NEITHER RADIOMETRICALLY NOR GEOMETRICALLY
ACCURATE AND SHOULD NEVER BE USED FOR QUANTITATIVE OR INTERPRETATIVE PURPOSES.
</Quote>

Regards
David Ramalho

David W Knisely

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Mar 28, 2001, 10:12:18 PM3/28/01

to Robert Clark

You sent:

> What explains the ridges seen on the rims of many of the craters in this
> image:
>

I don't see any ridges on the rims, but I do see large arc-like ridges
which look like they are concentric to Ascraeus Mon, which is just to
the northeast of the image area. These resemble the acurate fractures
(Fossae) seen around a number of the large volcanic features on Mars,
and are probably surface fracturing due to the load the large shield
volcanoes put on the upper crust of Mars.
--
David Knisely KA0...@navix.net
Prairie Astronomy Club, Inc. http://www.4w.com/pac
Hyde Memorial Observatory:
http://www.blackstarpress.com/arin/hyde

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* Attend the 8th Annual NEBRASKA STAR PARTY *
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David W Knisely

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Mar 28, 2001, 10:13:15 PM3/28/01

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should be "to the northwest".

atm...@excite.com

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Mar 30, 2001, 12:24:21 AM3/30/01

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Well, if what you mean is the strange landforms within the craters
that look like neatly piled heaps of dirt, they are indeed strange.

Blemishes of a most odd nature. The best I can guess at is possibly a
unique dune arrangment.

TA