Tag Archives: volcanics

THEMIS: Ascraeus Mons lava flows

THEMIS Image of the Day, August 20, 2019. The lava flows and other volcanic features in this VIS image (such as pit crater and pit chains) are part of Ascraeus Mons. Ascraeus Mons is the middle volcano in the aligned … Continue reading

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THEMIS: Nili Fossae graben

THEMIS Image of the Day, August 16, 2019. The two linear depressions in this VIS image are part of the Nili Fossae fracture system. Nili Fossae is the name of a collection of curved faults and down-dropped blocks of crust … Continue reading

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THEMIS: Flank of Albor Tholus volcano

THEMIS Image of the Day, August 6, 2019. Today’s VIS image shows a portion of the flank of Albor Tholus, a volcano found in the Elysium volcanic complex. The pits and cracks may have formed when the volcano’s flank responded … Continue reading

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THEMIS: Ascraeus Mons flank and lava plains

THEMIS Image of the Day, August 1, 2019. This VIS image is located where the southeastern flank of Ascraeus Mons meets the surrounding volcanic plains. Ascraeus Mons is the northernmost of the three large Tharsis volcanoes. Explore more THEMIS Images … Continue reading

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THEMIS: Elysium Chasma

THEMIS Image of the Day, July 30, 2019. This fracture system is called Elysium Chasma. Located west of Elysium Mons, it is just one of many large fractures in the Elysium volcanic complex. Explore more THEMIS Images of the Day … Continue reading

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Daedalia Planum flows combine dusty surfaces and exposed lava outcrops

[Editor’s note: From a paper by Christine Simurda and two co-authors recently published in the Journal of Geophysical Research.] The Unusual Thermophysical and Surface Properties of the Daedalia Planum Lava Flows • Unusual thermophysical variations are present on lava flows … Continue reading

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THEMIS: Graben in Elysium Fossae

THEMIS Image of the Day, July 29, 2019. Today’s VIS image shows a section of one of the graben that comprise Elysium Fossae. Graben are formed during tectonic activity, where blocks of material slide down between paired faults. Graben are … Continue reading

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HiRISE: This far and no further!

This far and no further! The very top of this image shows the edge of ancient lava flow that went no further across the plain. It’s also a natural boundary in the reflectivity (albedo) of the surface. HiRISE Picture of … Continue reading

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THEMIS: Edge of the caldera on Ascraeus Mons

THEMIS Image of the Day, July 12, 2019. Today’s VIS image is located on the summit of Ascraeus Mons, one of the three large Tharsis region volcanoes. This image clips just the edge of the large summit caldera. Explore more … Continue reading

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HiRISE: Terraced trough near Ceraunius Fossae

A terraced trough near Ceraunius Fossae. This may be a source region of flow material that enclosed the adjacent raised ridges and continues on to the north. High resolution can help to determine if the terraced forms are due to … Continue reading

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