APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Comments and questions about the APOD on the main view screen.
User avatar
APOD Robot
Otto Posterman
Posts: 3543
Joined: Fri Dec 04, 2009 3:27 am

APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by APOD Robot » Tue Aug 12, 2014 4:06 am

Image Collapse in Hebes Chasma on Mars

Explanation: What's happened in Hebes Chasma on Mars? Hebes Chasma is a depression just north of the enormous Valles Marineris canyon. Since the depression is unconnected to other surface features, it is unclear where the internal material went. Inside Hebes Chasma is Hebes Mensa, a 5 kilometer high mesa that appears to have undergone an unusual partial collapse -- a collapse that might be providing clues. The above image, taken by the robotic Mars Express spacecraft currently orbiting Mars, shows great details of the chasm and the unusual horseshoe shaped indentation in the central mesa. Material from the mesa appears to have flowed onto the floor of the chasm, while a possible dark layer appears to have pooled like ink on a downslope landing. A recent hypothesis holds that salty rock composes some lower layers in Hebes Chasma, with the salt dissolving in melted ice flows that drained through holes into an underground aquifer.

<< Previous APOD This Day in APOD Next APOD >>
[/b]

User avatar
alter-ego
Serendipitous Sleuthhound
Posts: 827
Joined: Mon Apr 21, 2008 4:51 am
Location: Redmond, WA

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by alter-ego » Tue Aug 12, 2014 4:17 am

Eerily similar to the deadly mudslide in Oso, Wa.
A pessimist is nothing more than an experienced optimist

Steve Dutch

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by Steve Dutch » Tue Aug 12, 2014 12:57 pm

You fools! That's a sand worm!

Guest

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by Guest » Tue Aug 12, 2014 1:24 pm

Assume that the black(er) areas are liquid based in origin. From appearances, that seems reasonable. Are we seeing oil or tar released from the substrate as a result of the 'slump' of the extrusion? Perhaps Mars suffers from some sort of hidden black-mold or algae (active life)caused by excess moisture?

starsurfer
Stellar Cartographer
Posts: 3522
Joined: Thu Mar 15, 2012 7:25 pm

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by starsurfer » Tue Aug 12, 2014 2:04 pm

Tomorrow's APOD could be a planetary nebula! :D

Boomer12k
:---[===] *
Posts: 2481
Joined: Sun Apr 22, 2007 12:07 am

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by Boomer12k » Tue Aug 12, 2014 3:51 pm

The Top of the mesa...not eroded....erosion starts at the sides....ice, at the side of the cliffs, melts, and flows a bit...then every time it is warm enough...flows a bit more. The sand on top, keeps that from melting...but at the edges...there is no insulation. The Erosion appears to start IN THE SAND...there is erosion at the top...along the edges...before it gets to HARDER MATERIAL...it is like the SPHINX....different layers of material, different densities, etc...

I used to be of the opinion that the erosion was sand....flowing down from the top....being dry, it flakes, and some material comes off, and erodes...but now, I am no longer of that opinion...this appears to be moisture. Moisture ALONG THE WHOLE CLIFF SIDE...However....looking at the large full picture...the erosion follows the Rock and Sand, ON TOP.....So...it could still be SAND and Rock erosion to some extent...and it has SCOURED the cliff side...But I have a more open mind at least...because that slide, looks like a Slide on Earth...

At the bottom of the cliffs, on the right side of the image, are places that look like water "POOLED"....and made a small lake, or at least a pond, that then dried....

I wonder at the time scale...WHEN did this happen...was it when Mars had oceans???? Or was it more recent? This type of Slide on EARTH, is generally Water Saturation of the hillside, there is too much weight,....then it shears...and collapses.

GREAT IMAGE!!! And at least it got me thinking...
:---[===] *

moles1138

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by moles1138 » Tue Aug 12, 2014 7:15 pm

Do you think this is the quarry from which they got the rock to build the Face? :wink:

User avatar
BMAONE23
Commentator Model 1.23
Posts: 4076
Joined: Wed Feb 23, 2005 6:55 pm
Location: California

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by BMAONE23 » Tue Aug 12, 2014 7:24 pm

moles1138 wrote:Do you think this is the quarry from which they got the rock to build the Face? :wink:
Not likely. The face is over 2600 miles away from this slump area and little green men wouldn't be able to transport them that far without the help of aliens which don't exist :mrgreen:

User avatar
JohnD
Tea Time, Guv! Cheerio!
Posts: 1139
Joined: Wed Feb 16, 2005 2:11 pm
Location: Lancaster, England

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by JohnD » Tue Aug 12, 2014 9:58 pm

What an extraordinary picture, with several areas that look wet!
The base of the rectangular depression and below the the slopes to the right. Plus the deeply eroded slopes themselves, as if by water.

It looks as if the water is still lying in the deprrsison below those slopes, so much so, I had to read and re-read the blurb, expecting the find "artists's reconstruction" or similar.
JOhn

User avatar
rstevenson
Quis custodiet ipsos custodes?
Posts: 2572
Joined: Fri Mar 28, 2008 1:24 pm
Location: Dartmouth, NS, Canada

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by rstevenson » Tue Aug 12, 2014 11:03 pm

Don't forget, those of you that are seeing water there, that the colour is exaggerated to highlight differences in the materials. To our unaided eyes, everything in this picture would be a more or less dull orange-brown. There is certainly no standing or flowing water -- Alas!.

From the "above image" link, I read, "A dark patch appears to pool like spilt ink across the debris. It is most likely loose material that has slid down the walls from an intermediate layer. Melted ice could have played a role by weakening the rocks to create its flow-like appearance."

Rob
Last edited by rstevenson on Tue Aug 12, 2014 11:04 pm, edited 1 time in total.

User avatar
bystander
Apathetic Retiree
Posts: 18344
Joined: Mon Aug 28, 2006 2:06 pm
Location: Oklahoma

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by bystander » Tue Aug 12, 2014 11:04 pm

Know the quiet place within your heart and touch the rainbow of possibility; be
alive to the gentle breeze of communication, and please stop being such a jerk.
— Garrison Keillor

ta152h0
Schooled
Posts: 1340
Joined: Mon Aug 29, 2005 12:46 am
Location: Auburn, Washington, USA

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by ta152h0 » Wed Aug 13, 2014 12:52 am

" Captain Kirk, deploy the paraglider with optical devices. We need to get to the bottom of this, so to speak "
Wolf Kotenberg

ta152h0
Schooled
Posts: 1340
Joined: Mon Aug 29, 2005 12:46 am
Location: Auburn, Washington, USA

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by ta152h0 » Wed Aug 13, 2014 12:54 am

by the way, not too long ago an object struck the moon and registered optically. Has the LRO spotted the crater ?
Wolf Kotenberg

User avatar
Chris Peterson
Abominable Snowman
Posts: 14341
Joined: Wed Jan 31, 2007 11:13 pm
Location: Guffey, Colorado, USA

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by Chris Peterson » Wed Aug 13, 2014 1:29 am

ta152h0 wrote:by the way, not too long ago an object struck the moon and registered optically. Has the LRO spotted the crater ?
Optical meteor impacts on the Moon are recorded all the time. But yes, a particularly large one last year generated a crater visible to LRO.
Chris

*****************************************
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com

User avatar
DavidLeodis
Perceptatron
Posts: 1169
Joined: Mon May 01, 2006 1:00 pm

Re: APOD: Collapse in Hebes Chasma on Mars (2014 Aug 12)

Post by DavidLeodis » Wed Aug 13, 2014 11:03 am

It's a great image and no doubt one that geologists will be able to study for some time. The detail is amazing.

I notice that just below the "with a brief explanation" there are what look like 3 landslides that seem to end abruptly still high up. I wonder why their material has not slipped all the way down?