Tantalus Fossae

Scaled Image

Image Credit: NASA/JPL/ASU

About this image

Today's VIS image shows a portion of Tantalus Fossae. The linear features are tectonic graben. Graben are formed by extension of the crust and faulting. 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 west-northwest/east-southeast direction.

The large number of graben around Alba Mons is generally believed to be the result of extensional forces associated with the uplift of the volcano. Tantalus Fossae is 2361 km (1467 miles) long.

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

Context

Image ID: 
V93854006 (View data in Mars Image Explorer)
44.7334
261.223
93854
2023-02-10 06:05
Tue, 2023-05-02
VIS
256 pixels (19 km)
3792 pixels (288 km)
0.075978 km/pixel
0.0762375 km/pixel

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