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Tharsis
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Mars: Tharsis province Tharsis region of Mars. A number of volcanoes are visible in this picture, which is a composite of several images taken by the Viking 1 and 2 Orbiters. In the centre left is Olympus Mons. The Martian volcano Arsia Mons, the southernmost of the line of three volcanoes on Tharsis Tharsis region, northern hemisphere of Mars. Olympus Mons is visible on the left; Ascraeus Mons is on the right. High clouds are also visible, especially in the far northern regions (top). This image was taken by the Mars Global Surveyor on June 1, 1998. Mosaic of more than 100 Viking orbiter photographs of Mars, showing most of a hemisphere centred near the equator and 80° W longitude. The large trough of the Valles Marineris extends from the Tharsis volcanoes on the west (left) eastward nearly 4,500 kilometres. White bands and streaks are water-ice clouds. topographic map of Mars
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Mars: Tharsis province
Mars: Tharsis province Topographic map of the Tharsis province of Mars made from high-resolution altimetry data collected by the Mars Global Surveyor spacecraft. Relief is color-coded, with elevation increasing through the spectrum from deep blue through red and then to brown and white; see map key. The view (north at top) includes the Tharsis rise (red area below center), the prominent volcanic peaks on and near the rise (brown and white), and the Valles Marineris canyon system to the east (lateral blue and green furrows). Also highlighted are the outflow channels (blue valleys on green plains) that drain from the west and south into Chryse Planitia (large blue region at the upper right).

Tharsis

region, Mars
Also known as: Tharsis Planitia
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History

Tharsis, extensive volcanic province on Mars that contains three of the planet’s most massive volcanoes. The province is focused on a rise or dome about 8,000 km (5,000 miles) across and 8 km (5 miles) high at the centre. Much of Tharsis is covered with volcanic plains, collectively called Tharsis Planitia, that comprise numerous superposed lava flows. Near the top of the rise, three large volcanoes—Ascraeus Mons, Pavonis Mons, and Arsia Mons—form a northeast-southwest-trending line. Together with Olympus Mons, which lies just off the rise to the northwest, these volcanoes are the largest known in the solar system.

Tharsis is at the centre of a vast system of radial fractures that cover roughly one-third of the planet. The fractures probably formed as a result of stresses created in the crust by the presence of the huge dome. The ages of the lava flows, as estimated from the amount of cratering, are about one billion to three billion years, but some individual volcanic features may be younger. The Tharsis rise may have been formed by both uplift and the buildup of lava flows.

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