Wednesday, February 17, 2010

Gullies in Terra Sirenum

Posted By on Wed, Feb 17, 2010 at 5:38 PM

PSP_001684_1410.jpg
  • NASA/JPL/University of Arizona

Gorgeous new HiRISE shots from the UA's Lunar and Planetary Lab are up, including this shot of gullies in a crater in Terra Sirenum.

HiRISE team member Kelly Kolb tells us:

This observation shows gullies in a crater in Terra Sirenum. The gullies unusually emanate from different elevations along the crater wall. Several of the gullies are extremely developed and incised, while others have very narrow, shallow channels.

Many of the gullies appear to have extensive debris aprons, but that could be deceiving. Based on

their surroundings, the topography underlying the debris aprons is likely not flat or gently sloping. This might cause the debris apron material to cover a wider surface area, without being as large of a volume as it might appear visually, than it otherwise would.

The subimage shows a gully with many channels. Several of the channels overlap or are overlapped by debris aprons suggesting that multiple flow episodes occurred here. In particular, there is a large channel that sticks out from underneath the main debris apron with a debris apron of its own. If this channel originated where the alcove currently is, then it is possible that the past flow contained more liquid and that the source of liquid to form the gullies in this region is now available in smaller amounts for an unknown reason.

Comments

Subscribe to this thread:

Add a comment

More by Jim Nintzel

Today | Tue | Wed | Thu | Fri | Sat | Sun
Meditation and Buddhist study

Meditation and Buddhist study @ Sky Island Zen

Tuesdays, Saturdays

All of today's events | Staff Picks

Staff Pick

Carnival of Illusion: Magic, Mystery & Oooh La La!

This top-rated illusion show is "Revitalizing Magic" by blending an international travel theme with all the charms… More

@ Scottish Rite Grand Parlour Saturdays. Continues through April 14 160 South Scott Ave

» More Picks

Submit an Event Listing

Popular Content

  1. Steve Bannon Beats the Drum Against Undocumented Immigrants in Tucson Appearance (The Range: The Tucson Weekly's Daily Dispatch)
  2. Laughing Stock: The People's Pervert Does Christmas (The Range: The Tucson Weekly's Daily Dispatch)
  3. Casa Video Top 10 (The Range: The Tucson Weekly's Daily Dispatch)
  4. The Koch Brothers Are Spending Money To Make Arizona's Education More To Their Liking (The Range: The Tucson Weekly's Daily Dispatch)
  5. National Stars Shine on Tucson’s Comedy Fest (The Range: The Tucson Weekly's Daily Dispatch)

© 2017 Tucson Weekly | 7225 Mona Lisa Rd. Ste. 125, Tucson AZ 85741 | (520) 797-4384 | Powered by Foundation