Other
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufm.p33b1461w&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #P33B-1461
Other
8010 Fractures And Faults, 8149 Planetary Tectonics (5475)
Scientific paper
We quantify fault-related strains for the western hemisphere by using Kostrov's formula and the updated Knapmeyer et al. fault catalog. As a first step we match the formula and fault catalog to previously reported measurements of strain (ɛ) in five areas for normal faulting and two areas for thrust faulting in Tharsis. Using these comparisons, a strain and faulting depth map of the western hemisphere is generated. We obtain good agreement in strain magnitudes from each of the study areas by systematically varying the scaling parameter (γ) and fault dip angles to determine values for the depth of faulting (z), or the depth of the seismic lower stability zone (600°C paleogeotherm). We find for the northern plains NE of Alba Patera, ɛ = 0.2% and z = 8-11 km; Alba Patera's east flank, ɛ = 0.8% and z = 8-10 km; Alba Patera's south flank and southern plains, ɛ = 0.6% and z = 5-9 km; Tempe Terra, ɛ = 3% and z = 16 km; Thaumasia, ɛ = 0.6% and z = 10 km; Arcadia Planitia, ɛ = -0.06% and z = 35-45km; Lunae Planum, ɛ = -0.29% and z = 25-30 km by using the best-fitting range of γ = 10 -4 - 10 -2, normal fault dip angle of 55° ± 5°, and thrust fault dip angle of 30° ± 5°, all in close agreement with terrestrial values. Normal faulting depths around Tharsis range from 5 to 16 km and thrust faulting depths range from 25 to 45 km with a general west to east increase in fault depth north of the Tharsis Montes, except for the plains northeast and on the east flank of Alba Patera which are underlain by a faulted layer of comparable thickness. Interestingly, the depths of thrust faulting beneath wrinkle ridges of Arcadia Planitia and Lunae Planum are in close agreement with those previously calculated in Amenthes Rupes in the eastern hemisphere, showing in these regions that the thickness of the seismogenic crust is similar between the southern highlands and the northern plains.
Schultz Richard A.
Weller M. B.
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