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Today's VIS image is shows a portion of Tempe Fossae. The fossae are graben comprised of paired, parallel fractures with a down-dropped block of material between the fracture set. This morphology is created by extensional tectonic stresses. When large amounts of pressure or tension are applied to rocks on timescales that are fast enough that the rock cannot respond by deforming, the rock breaks along faults. In the case of a graben, two parallel faults are formed by extension of the crust and the rock in between the faults drops downward into the space created by the extension. Numerous sets of graben are visible in this THEMIS image, trending from north-northeast to south-southwest. Because the faults defining the graben are formed perpendicular to the direction of the applied stress, we know that extensional forces were pulling the crust apart in the north-northwest/south-southeast direction.

This fossae system is located in Tempe Terra, a complexly fractured region between Tharsis and Acidalia Planitia. The complete fossae system in almost 2000 km (1242 miles) long.

Orbit Number: 93791 Latitude: 37.9726 Longitude: 279.906 Instrument: VIS Captured: 2023-02-05 01:33

Please see the THEMIS Data Citation Note for details on crediting THEMIS images.

NASA's Jet Propulsion Laboratory manages the 2001 Mars Odyssey mission for NASA's Science Mission Directorate, Washington, D.C. The Thermal Emission Imaging System (THEMIS) was developed by Arizona State University, Tempe, in collaboration with Raytheon Santa Barbara Remote Sensing. The THEMIS investigation is led by Dr. Philip Christensen at Arizona State University. Lockheed Martin Astronautics, Denver, is the prime contractor for the Odyssey project, and developed and built the orbiter. Mission operations are conducted jointly from Lockheed Martin and from JPL, a division of the California Institute of Technology in Pasadena.