Tag Archives: collapse pits

THEMIS: Pits at caldera’s edge

THEMIS Image of the Day, January 3, 2018. This THEMIS image shows part of the caldera floor of Arsia Mons. It is not uncommon for calderas to have “flat” floors after the final explosive eruption the empties the subsurface magma … Continue reading

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THEMIS: Arsia Mons’ collapse pits

THEMIS Image of the Day, January 1, 2018. This VIS image shows part of the northeastern flank of Arsia Mons at the summit caldera. In this region the summit caldera does not have a steep margin most likely due to … Continue reading

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THEMIS: Collapse features on flank of Ascraeus Mons

THEMIS Image of the Day, September 5, 2017. This image shows part of the northeastern flank of Ascraeus Mons, along the trend that joins the three large Tharsis volcanoes. The image has a myriad of collapse features from circular to … Continue reading

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HiRISE: South polar pit or an impact crater?

It is late summer in the Southern hemisphere, so the Sun is low in the sky and subtle topography is accentuated in orbital images. We see many shallow pits in the bright residual cap of carbon dioxide ice (also called … Continue reading

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THEMIS: Lava tube skylights in Daedalia Planum

THEMIS Image of the Day, May 19, 2017. Today’s VIS image show lava flows in Daedalia Planum that originated from Arsia Mons. At lower right, note the three circular “skylights” — places where the roof of an underground lava tube … Continue reading

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HiRISE: Pits and channels of Hebrus Valles

The drainages in this image are part of Hebrus Valles, an outflow channel system likely formed by catastrophic floods. Hebrus Valles is located in the plains of the Northern lowlands, just west of the Elysium volcanic region. Individual channels range … Continue reading

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HiRISE: Mesas and pits

What’s up and what’s down? This image covers mesas, or high-standing plateaus, to the north and pits, or low-standing, depressions to the south. If it looks the other way around, then you are not seeing the topography correctly. Remember that … Continue reading

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THEMIS: Tractus Catena

THEMIS Image of the Day, July 5, 2016. This VIS image shows part of Tractus Catena, just one of many north/south trending tectonic graben located south of Alba Mons. The features running vertically in the image are part of Tractus … Continue reading

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HiRISE: Faulted layers in collapse pits

This image shows a set of coalesced collapse pits in western Valles Marineris. Fine layers are exposed in the walls of the pits, and in some places those layers are displaced by faults. What formed these layers, and what caused … Continue reading

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HiRISE: Pit near Elysium Mons

Pit near Elysium Mons. Beautiful Mars series.

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