A Long and Winding Channel in Tharsis
NASA/JPL/University of Arizona
A Long and Winding Channel in Tharsis
ESP_045368_2040  Science Theme: 
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The Tharsis region of Mars is covered in vast lava flows, many with channels. Some channels, however, resemble features that may have been formed by water.

In this image, we see a smooth, flat-bottomed channel within the roughly irregular edges of a possible lava flow. This long, winding channel runs for 115 kilometers (70 miles) from its source (shown in ESP_045091_2045), maintaining a nearly consistent width. There is also a streamlined island within the channel, which is 1.25 kilometers (about 3/4 mile) long.

One possibility is that a lava flow formed, and later groundwater was released, preferentially flowing through and further eroding the pre-existing lava channel. Or, the original lava flow could have been a very low-viscosity lava. We look at the shape and profile of the channel, and the channel and lava flow edges, to understand the characteristics of the fluids at work. Although there are lava flows and rivers on Earth that we can observe to understand the processes at work, the interplay of the features on Mars may tell a more complicated story.

We want to be able to understand the history of volcanic activity in Tharsis, as well as possible interaction with ground water release, to better understand some of the younger landforms on Mars.
Written by: Sarah Sutton (audio: Tre Gibbs)  (5 October 2016)

This is a stereo pair with ESP_046436_2040.
 
Acquisition date
31 March 2016

Local Mars time
15:08

Latitude (centered)
23.575°

Longitude (East)
249.080°

Spacecraft altitude
277.7 km (172.6 miles)

Original image scale range
55.9 cm/pixel (with 2 x 2 binning) so objects ~168 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
6.9°

Phase angle
37.2°

Solar incidence angle
44°, with the Sun about 46° above the horizon

Solar longitude
130.5°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  9.1°
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All of the images produced by HiRISE and accessible on this site are within the public domain: there are no restrictions on their usage by anyone in the public, including news or science organizations. We do ask for a credit line where possible:
NASA/JPL/University of Arizona

POSTSCRIPT
NASA’s Jet Propulsion Laboratory, a division of the California Institute of Technology in Pasadena, Calif., manages the Mars Reconnaissance Orbiter for NASA’s Science Mission Directorate, Washington. The HiRISE camera was built by Ball Aerospace and Technology Corporation and is operated by the University of Arizona.