(1986). For the past two weeks JPL’s image site has been releasing a string of images taken by Mars Odyssey of the smallest of Mars’ four giant volcanoes. Scientists believe that this volcanic province is … The Tharsis quadrangle is also home to large troughs (long narrow depressions) called fossae in the geographical language used for Mars. The tallest volcano on the planet, Olympus Mons, is often associated with the Tharsis region but is actually located off the western edge of the plateau. The larger southern portion of Tharsis (pictured right) lies on old cratered highland terrain. The Tharsis region of Mars; north toward top. The NSVs may be relicts from catastrophic floods of water, similar to the huge outflow channels that empty into Chryse Planitia, east of Tharsis. Scott, D.H.; Tanaka, K.L. c) Mars: Tharsis Bulge, where crust has been bulged outward; Valles Marineris, where crust has been stretched to form a broad & deep chasm; large volcanoes (mainly associated with Tharsis Bugle), most notably Olympus Mons. Tharsis is so large and massive that it has likely affected the planet's moment of inertia, possibly causing a change in the orientation of the planet's crust with respect to its rotational axis over time. Morphological and structural data from the whole Tharsis province suggest that a number of shallow grabens radially oriented about the Tharsis bulge on Mars are underlain by dykes, which define giant radiating swarms similar to, e.g. This lies mostly in the southern hemisphere. 41st Lunar and Planetary Science Conference, LPI: Houston, Abstract #2007", "Tectonics of the Tharsis Region of Mars: Insights from MGS Topography and Gravity. C) New York City. Studies show that the volcanoes of Tharsis caused most of the major fossae on Mars. C) New York City. In appearance, they are much like the lunar maria. ; Scott, D.H.; Greeley, R. (1992). Alba Mons is so large and topographically distinct that it can almost be treated as an entire volcanic province unto itself. The name is commonly used in a broad sense to represent a continent-sized region of anomalously elevated terrain centered just south of the equator around longitude 265°E. of Martian history. Images of Mars have shown a large number of these tectonic features concentrated on or near the Tharsis region. According to the standard view, Tharsis overlies a hot spot, similar to the one thought to underlie the island of Hawaii. The western portion of the volcano lies in the Amazonis quadrangle (MC-8) and the central and eastern portions in the adjoining Tharsis quadrangle (MC-9). The rifts are produced through regional tectonic forces operating in the crust and underlying mantle. "The Formation of Tharsis on Mars: What the Line-of-Sight Gravity Is Telling Us", "More Speculations on the Origin of the Tharsis Rise. D) North America. The flanks of volcanoes commonly exhibit shallow gravity slumps, faults and associated folds. The tear-fault system on Tharsis is represented by the radial fossae, of which Valles Marineris is the largest example. Tectonic processes of various kinds and, to a lesser extent, impact cratering are the most important processes occuring on Venus' surface. A) Due to the gravitational pull of Mars' moons, most small meteoroids are deflected and never make it to the surface. To the right of these three volcanoes is the beginning of Valles Marinerus. This sounded like a pretty straightforward explanation for the formation of some of the features evident on Mars, such as the Helles crater and the Tharsis bulge. Olympus Mons reaches an astonishing height of 16 miles (26 kilometers) - three times as tall as Mount Everest. Tanaka, K.L. The new model proposes that the oceans formed before or at the same time as Mars’ largest volcanic feature, Tharsis, instead of after Tharsis formed 3.7 billion years ago. Mount Etna is a complex spreading volcano that is characterized by three main structural features: a volcanic rift system that crosses the summit in a north-northeast direction; a peripheral compression belt (thrust front) surrounding the base of the volcano; and an east-northeast trending system of transtensional (oblique normal) faults that connect the summit rift to the peripheral thrust front. [32], Spacecraft exploration over the last two decades has shown that volcanoes on other planets can take many unexpected forms. ESA/DLR/FU Berlin/Justin Cowart. [34] Recent work has attempted to refine the definition of a volcano to incorporate geologic features of widely different shapes, sizes, and compositions throughout the Solar System. However, recent work on large terrestrial volcanoes indicates that the distinction between volcanic and tectonic processes is quite blurry, with significant interplay between the two. Coordinates: .mw-parser-output .geo-default,.mw-parser-output .geo-dms,.mw-parser-output .geo-dec{display:inline}.mw-parser-output .geo-nondefault,.mw-parser-output .geo-multi-punct{display:none}.mw-parser-output .longitude,.mw-parser-output .latitude{white-space:nowrap}0°N 260°E / 0°N 260°E / 0; 260[42], This article is about the volcanic plateau on Mars. The Tharsis region is an enormous bulge that causes major tectonic disruptions across the planet when it tries to settle down from its height and reach equilibrium with the rest of the planet. November 14, 2017 at 10:42 am Robert Zimmerman Essays and Commentaries two tectonically active regions Mars... Equatorial region of Mars ' moons, most small meteoroids are deflected and never make it to the of... 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