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Table 4 Brittle–ductile transition (km) calculated using strain-rate of 10-17 s-1

From: Strength models of the terrestrial planets and implications for their lithospheric structure and evolution

Model Thermal gradient (K/km)
5 7.5 10 12.5 15 17.5 20
Mercury
 dry 75 55 43 30 26 22 20
 wet 47 19 15 13 11 10 9
Venus
 dry 24 19 15 9 8 7 6
Earth
 dry 75 57 46 39 34 30 27
 wet 41 34 29 25 22 20 19
 clay 83 60 48 39 34 29 26
Mars
 dry 110 78 62 46 39 34 30
 wet 74 40 32 27 23 20 18
 clay 110 78 40 33 27 24 21