A crustal block with mean density rho_1 is initially in isostatic equilibrium wi

Question

A crustal block with mean density rho_1 is initially in isostatic equilibrium with the surrounding rocks whose density is rho_2 as shown in Figure (a). After erosion, the new surface topography is shown in Figure (b). The distance L remains constant (i.e. there is no erosion at the highest point A) and Airy-type isostatic equilibrium is maintained. Derive in terms of L, rho_1 and rho_2 the amount by which the height of point A with respect to the surface is changed. Is the height of A with respect to the surface higher or lower than in Figure (a)? Explain why.

Explanation / Answer

A crustal block with mean density rho_1 is initially in isostatic equilibrium wi

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