Tag Archives: Sirenum Fossae

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: Tectonics in Sirenum Fossae

THEMIS Image of the Day, May 3, 2017. Today’s false color image shows part of Sirenum Fossae. The linear depressions in this image, called graben, were formed by tectonic activity. The THEMIS VIS camera contains 5 filters. The data from … Continue reading

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THEMIS: Varieties of geo-chaos in Gorgonum

THEMIS Image of the Day, May 2, 2017. Today’s false color image shows part of Gorgonum Chaos. Chaotic regions form when groundwater escapes to the surface, undermining it and causing the ground to collapse. The linear depression at the bottom … Continue reading

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THEMIS: Tectonics in Sirenum Fossae

THEMIS Image of the Day, January 12, 2017. The linear depressions in this VIS image are graben. Graben are formed from tectonic activity with large blocks of material moving downward between paired faults. The crater in the bottom half of … Continue reading

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THEMIS: Tectonics showcase in Sirenum Fossae

THEMIS Image of the Day, November 29, 2016. Today’s VIS image shows part of Sirenum Fossae, a large graben on the margin between Terra Sirenum and Daedalis Planum. Grabens are formed by the downward movement of material between parallel tectonic … Continue reading

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THEMIS: Sirenum Fossae

THEMIS Image of the Day, July 3, 2015. The linear features in this VIS image are faults. Where depressions are formed bounded by faulting the feature is called a graben. These faults and graben are part of a large region … Continue reading

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HiRISE: Fresh crater near Sirenum Fossae

This impact crater appears relatively recent as it has a sharp rim and well-preserved ejecta. The steep inner slopes are carved by gullies and include possible recurring slope lineae on the equator-facing slopes. Fresh craters often have steep, active slopes, … Continue reading

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THEMIS: Sirenum Fossae

THEMIS Image of the Day, May 28, 2015. The THEMIS VIS camera contains 5 filters. The data from different filters can be combined in multiple ways to create a false color image. These false color images may reveal subtle variations … Continue reading

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THEMIS: More Sirenum Fossae

THEMIS Image of the Day, May 1, 2015. The subtle paired fractues at the bottom of this VIS image are part of Sirenum Fossae, though it is hundreds of km away from yesterday’s image location. Numerous gullies at the top … Continue reading

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THEMIS: Sirenum Fossae

THEMIS Image of the Day, April 30, 2015. Today’s VIS image shows several linear depressions that cross an unnamed crater. The depressions are tectonic fractures that are hundreds of km long. More THEMIS Images of the Day by geological topic.

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