Shield Volcano with a Summit Caldera
Shield Volcano with a Summit Caldera
ESP_016173_2005  Science Theme: Volcanic Processes
Although there are a few truly giant shield volcanoes on Mars, there are also many smaller shield volcanoes. We are interested in imaging the vent regions of volcanoes to understand volcanic processes, and also to search for any signs of especially recent activity.

It has been suggested that active volcanism is one possible explanation for the methane gas that has been detected in the atmosphere of Mars. This HiRISE image shows that the summit caldera is mantled by dust and covered by small impact craters, so there is essentially zero chance that this volcano was active recently enough to affect current atmospheric trace gases.

Written by: Alfred McEwen  (20 January 2010)
Acquisition date
07 January 2010

Local Mars time

Latitude (centered)

Longitude (East)

Spacecraft altitude
274.9 km (170.9 miles)

Original image scale range
55.0 cm/pixel (with 2 x 2 binning) so objects ~165 cm across are resolved

Map projected scale
50 cm/pixel and North is up

Map projection

Emission angle

Phase angle

Solar incidence angle
40°, with the Sun about 50° above the horizon

Solar longitude
34.7°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  4.0°
Black and white
map projected  non-map

IRB color
map projected  non-map

Merged IRB
map projected

Merged RGB
map projected

RGB color
non-map projected

Black and white
map-projected   (288MB)

IRB color
map-projected   (137MB)

Black and white
map-projected  (154MB)
non-map           (150MB)

IRB color
map projected  (66MB)
non-map           (150MB)

Merged IRB
map projected  (319MB)

Merged RGB
map-projected  (317MB)

RGB color
non map           (138MB)
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products

IRB: infrared-red-blue
RGB: red-green-blue
About color products (PDF)

Black & white is 5 km across; enhanced color about 1 km
For scale, use JPEG/JP2 black & white map-projected images

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’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.