We calculate the amount of crustal stretching across the Valles Marineris and a large graben structure in the western Thaumasia region (the “Thaumasia graben” [1,2]). We measure vertical offsets in a set of transects using data obtained by the MOLA laser altimeter. Assuming a fault dip angle of 60°, correcting for landslide deposits, but ignoring other sediment cover, we obtain extension values...
