MAAT MONS is a massive shield volcano . It is the second-highest
mountain, and the highest volcano, on the planet
Venus . It rises 8
kilometres (5.0 mi) above the mean planetary radius at 0°30′N
194°36′E / 0.5°N 194.6°E / 0.5; 194.6 , and nearly 5 km
above the surrounding plains. It is named after the Egyptian goddess
of truth and justice, Ma\'at .
* 1 Structure
* 2 Activity
* 3 See also
* 4 References
* 5 External links
Maat Mons has a large summit caldera , 28×31 km in size. Within the
large caldera there are at least five smaller collapse craters , up to
10 km in diameter.
A chain of small craters 3–5 km in diameter extends some 40 km
along the southeast flank of the volcano, but rather than indicating a
large fissure eruption, they seem to also be formed by collapse: full
resolution imagery from the
Magellan probe reveals no evidence of lava
flows from these craters.
At least two large scale structural collapse events seem to have
occurred in the past on Maat Mons.
Radar sounding by the
Magellan probe revealed evidence for
comparatively recent volcanic activity at Maat Mons, in the form of
ash flows near the summit and on the northern flank.
Intriguingly for planetary geologists , atmospheric studies carried
out by the Pioneer
Venus probes in the early 1980s revealed a
considerable variation in the concentrations of sulfur dioxide (SO2)
and methane (CH4) in Venus' middle and upper atmosphere. One possible
explanation for this was the injection of volcanic gases into the
atmosphere by plinian eruptions at Maat Mons.
More recent studies have suggested that the volcano structure,
distribution of lava flows, pit craters, summit morphology, and other
small-scale features are indicative of recent volcanic activity on
Although many lines of evidence suggest that
Venus is likely to be
volcanically active, present-day eruptions at
Maat Mons have not been
* List of mountains on
* Volcanology of
* ^ "Maat Mons". Gazetteer of Planetary Nomenclature. USGS
Astrogeology Research Program.
* ^ "PIA00106:
Venus - 3D Perspective View of Maat Mons". Planetary
Jet Propulsion Lab . 1996-08-01. Retrieved 2012-06-30.
External link in work= (help )
* ^ A B C Mouginis-Mark P. J. (1994). "Morphology of Venus
Calderas: Sif and Maat Montes" (PDF). Abstracts of the 25th Lunar and
Planetary Science Conference, held in Houston, TX, 14–18 March 1994:
* ^ Robinson, Cordula A.; Thornhill, Gill D.; Parfitt, Elisabeth A.
(1995). "Large-scale volcanic activity at Maat Mons: Can this explain
fluctuations in atmospheric chemistry observed by Pioneer Venus?".
Journal of Geophysical Research. 100 (E6): 11755–11763. Bibcode
:1995JGR...10011755R. doi :10.1029/95JE00147 .
* ^ Mouginis-Mark, Peter J. (2016-10-01). "Geomorphology and
volcanology of Maat Mons, Venus". Icarus. 277: 433–441. doi