Tag Archives: graben

THEMIS: Lava flows chopped by graben in Olympica Fossae

THEMIS Image of the Day, May 21, 2018. The linear channel in the bottom half of this VIS image is part of Olympica Fossae. Olympica Fossae is a complex channel form located on the Tharsis plains between Alba Mons and … Continue reading

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THEMIS: Volcanic fissure in Labeatis Fossae

THEMIS Image of the Day, May 8, 2018. The feature that crosses this VIS image is a graben. Graben are formed by tectonic action, where a block of material moves downward between a pair of faults. The northern part of … Continue reading

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THEMIS: Big blocky faults in Sacra Fossae

THEMIS Image of the Day, April 19, 2018. Located on the western margin of Lunae Planum, Sacra Fossae is a group of linear depressions. The right angle turns and uniform width seen in this VIS image indicate that these channels … Continue reading

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THEMIS: Channels cutting across channels in Olympica Fossae

THEMIS Image of the Day, April 12, 2018. Olympica Fossae is a complex channel located on the volcanic plains between Alba Mons and Olympus Mons. The sinuosity of the large channel in the middle of the image indicates that this … Continue reading

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HiRISE: The exposed exterior of a modified crater in Tantalus Fossae

The exposed exterior of a modified crater in Tantalus Fossae. Many craters in this area have been extensively modified, but few are sitting on the edge of a graben like this. This position exposes parts of the crater exterior and … Continue reading

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HiRISE: A sample of Phlegethon Catena

A sample of Phlegethon Catena. This area is full of graben, which are depressions that often run parallel to faults. Beautiful Mars series.

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HRSC: Fracture swarms on Mars

These striking features on Mars were caused by the planet’s crust stretching apart in response to ancient volcanic activity. The fractures in the Sirenum Fossae region in the southern hemisphere were imaged by ESA’s Mars Express in March. They extend … Continue reading

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THEMIS: Lava tube takes a sharp turn

THEMIS Image of the Day, November 6, 2017. This image shows part of the eastern flank of Pavonis Mons. Surface lava flows run down hill from the upper left of the image towards the bottom right. Perpendicular to that trend … Continue reading

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THEMIS: Fractures on Pavonis Mons’ flank

THEMIS Image of the Day, October 31, 2017. This image shows part of the western flank of Pavonis Mons. The linear features are faults. Faulting usually includes change of elevation, where blocks of material slide down the fault. Paired faults … Continue reading

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THEMIS: Pit craters on Ascraeus Mons

THEMIS Image of the Day, September 4, 2017. This image shows a collapse feature on the southeastern flank of the volcano. The circular/scalloped margin of the collapse is typical for ceiling collapse into a lava tube. However, the potential lava … Continue reading

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