Progress in Earth and Planetary Science

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)
Model	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

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