Shield Volcano with Leveed Channels in Noctis Fossae
NASA/JPL-Caltech/UArizona
Shield Volcano with Leveed Channels in Noctis Fossae
PSP_010661_1780  Science Theme: Volcanic Processes
This image shows a small shield volcano covering Noctis Fossae in the eastern Tharsis region of Mars. The Tharsis region is located on the Martian equator and contains some of the Solar System's largest volcanoes.

Shield volcanoes have shallow-sloping sides and get their name from their resemblance to a warrior's shield. They form from basaltic lava that flows easily, or has a low viscosity, and builds up over time to form a broad shield volcano profile.

The oval shaped depression in the center of the image is the summit pit of the volcano that contains a cooled lava pond. Emanating radially from the lava pond are several raised, leveed lava channels. Lava channels are narrow pathways through which lava flows onto the volcano surface. The volume of lava in the channel often fluctuates, and sometimes lava will overflow the channel. When this happens, lava congeals and cools along the edges of the channel forming natural levees and building up the lava channel above the surrounding surface.

Some of the largest volcanoes on Earth, such as Mauna Loa and Mauna Kea of Hawaii, are shield volcanoes.



Written by: Maria Banks  (28 January 2009)

This is a stereo pair with PSP_010305_1780.
 
Acquisition date
04 November 2008

Local Mars time
15:42

Latitude (centered)
-1.921°

Longitude (East)
256.309°

Spacecraft altitude
258.3 km (160.5 miles)

Original image scale range
51.7 cm/pixel (with 2 x 2 binning) so objects ~155 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
0.9°

Phase angle
56.2°

Solar incidence angle
57°, with the Sun about 33° above the horizon

Solar longitude
152.2°, Northern Summer

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  21.2°
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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.