A Volcanic Pit Chain and Dust Avalanches
NASA/JPL/University of Arizona
A Volcanic Pit Chain and Dust Avalanches
ESP_026249_2025  Science Theme: Fluvial Processes
twitter  •  tumblr

HICLIP
720p (MP4)
Audio (MP3)

WALLPAPER
800
1024
1152
1280
1440
1600
1920
2048
2560

HIFLYER
PDF (11 x 17)

HISLIDES
PowerPoint
Keynote
PDF

This observation shows a volcanic pit chain in Amazonis Planitia.

Associated with two of the pits are meandering channels that splay into distributary patterns to the north. This suggests that the pits are eruptive centers, with the channels carved by lava.

A close-up image shows the eastern wall of the westernmost pit. The fluid-like streaks are the products of dust avalanches, with the dark color resulting from a thin coating of dust that has been removed from the surface.

The upper wall of the pit shows at least four distinct layers, each representing a sequence of one or more lava flows. A hazy, blueish haze bounds the outer circumference of the pit, perhaps resulting from suspended dust. The plains near the pit appear heavily muted, indicating a thick dust cover.

Written by: Nathan Bridges  (11 April 2012)

This is a stereo pair with ESP_026750_2025.
 
Acquisition date
02 March 2012

Local Mars time
15:06

Latitude (centered)
22.267°

Longitude (East)
202.699°

Spacecraft altitude
287.3 km (178.5 miles)

Original image scale range
29.0 cm/pixel (with 1 x 1 binning) so objects ~87 cm across are resolved

Map projected scale
25 cm/pixel and North is up

Map projection
Equirectangular

Emission angle
8.0°

Phase angle
35.0°

Solar incidence angle
43°, with the Sun about 47° above the horizon

Solar longitude
78.0°, Northern Spring

For non-map projected images
North azimuth:  97°
Sub-solar azimuth:  17.8°
JPEG
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

JP2
Black and white
map-projected   (1318MB)

IRB color
map-projected   (689MB)

JP2 EXTRAS
Black and white
map-projected  (717MB)
non-map           (612MB)

IRB color
map projected  (250MB)
non-map           (525MB)

Merged IRB
map projected  (317MB)

Merged RGB
map-projected  (305MB)

RGB color
non map           (510MB)
ANAGLYPHS
Map-projected, reduced-resolution
Full resolution JP2 download
Anaglyph details page

ADDITIONAL INFORMATION
B&W label
Color label
Merged IRB label
Merged RGB label
EDR products
HiView

NB
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

USAGE POLICY
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.