Since seismic measurements were not yet conducted on Mars, several different methods (and constraining parameters) have been applied to estimate the Martian crustal thickness. Bills and Nerem (1995) estimated the mean crustal thickness to be between 50 and 200 km. Sohl and Spohn (1997) used geochemical arguments to estimate that Nolatrexed the mean crustal thicknesses is within the range of 100 to 250 km. Norman (1999) estimated that less than 45 km of crust could be geochemically enriched. Viscous relaxation studies of Zuber et al. (2000) and Nimmo and Stevenson (2001) indicated that the average crustal thickness is somewhere between 50 and 100 km. Nimmo (2002) inferred a maximum possible crustal thickness of 75 km across the dichotomy boundary with the global average of about 55 km. Turcotte et al. (2002) estimated birth rate the crustal thickness around Hellas basin exceeds 90 km. Studying a spectral-admittance of major highland features, McGovern et al. (2002) estimated the lower limit of the average crustal thickness at 32 km. Wieczorek and Zuber (2004) suggested an average thickness of 50±12 km50±12 km from the review of previous geophysical and geochemical studies.
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