Tag Archives: volcanics

THEMIS: Tectonics and volcanism in Syria Planum

THEMIS Image of the Day, December 4, 2018. This VIS image shows a linear depression in Syria Planum. Volcanic activity, including broad shield volcanoes and extensive volcanic plains created this region of the Tharsis system south of Noctis Labyrinthus. Linear … Continue reading

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THEMIS: Solis Planum lava flows and graben

THEMIS Image of the Day, November 30, 2018. Today’s VIS image shows part of Solis Planum. Both volcanic and tectonic forces created the features in this image. The linear features that run diagonally across the image are fault features called … Continue reading

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InSight: First photo of Elysium Planitia

Elysium Planitia, as seen through a dust-spattered dust cover. Click the image to enlarge it. NASA’s InSight Mars lander acquired this image of the area in front of the lander using its lander-mounted, Instrument Context Camera (ICC). This image was … Continue reading

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THEMIS: Swiss-cheese weathering in old volcanic region

THEMIS Image of the Day, November 22, 2018. Amphitrites Patera is an old volcanic complex located south of Hellas Planitia. The surface in this VIS image has a unusual “Swiss-cheese” texture, one seen more commonly on the nearby south polar … Continue reading

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Mantle plumes still active under Tharsis, Elysium?

[Editor’s note: From a paper by A.-C. Plesa and eight co-authors recently published in Geophysical Research Letters.] The thermal state and interior structure of Mars We constrain the thermal state and interior structure of Mars by combining a large number … Continue reading

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THEMIS: Pit chains and craters on Ascraeus Mons

THEMIS Image of the Day, November 7, 2018. The linear features in this VIS image are located on part of the large flow feature on the southern flank of Ascraeus Mons. The features most likely formed by collapse of the … Continue reading

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HiRISE: A caldera’s steep slopes

This image shows part of the steep wall of the caldera (a large volcanic crater) at the top of Ascraeus Mons, one of Mars’ giant volcanoes. We can see chutes carved into the soft dust that has built up on … Continue reading

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HiRISE: Possible rock falls on steep slopes

Possible rock falls on steep slopes in Cerberus Fossae. Our goal here is to take “before” images at HiRISE resolution in order to identify fresh rockfalls that might be able to be associated with seismic events or Marsquakes detected by … Continue reading

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Olympus Mons and Ascraeus Mons: Geologically recent lava inflation

The summit of Olympus Mons displays lava flows, some of which are truncated by the caldera, that appear to have flowed uphill. Because lava flows downhill, this mismatch between the flow direction and present-day topography suggests that the terrain has … Continue reading

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Volcanic ash: Major source of Mars dust?

[Editor’s note: From a paper by Charlie Bristow and Torsten Moller, recently published in the Journal of Geophysical Research.] Dust Production by Abrasion of Eolian Basalt Sands: Analogue for Martian Dust • Collisions between particles and surfaces during eolian abrasion … Continue reading

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