The linear features in this image from NASA 2001 Mars Odyssey spacecraft are faults. Where depressions are formed bounded by faulting the feature is called a graben. These faults and graben are part of a large region of faulting called Sirenum Fossae.

The linear features in this VIS image are faults. Where depressions are formed bounded by faulting the feature is called a graben. These faults and graben are part of a large region of faulting called Sirenum Fossae. Orbit Number: 59353 Latitude: -24.4596 Longitude: 220.937 Instrument: VIS Captured: 2015-05-01 20:03 http://photojournal.jpl.nasa.gov/catalog/PIA19503

Mars 2001 Mars Odyssey