Fig. 15

image

Pressure versus depth inside the nucleus, for different initial sizes of the nucleus (radius R = 2.2, 3.0, 5.0 or 7.0 km). The pressure increases with depth. The blue range corresponds to the best value of 30150 Pa for the compressive strength of the surface materials we see today (30150 Pa). The red line at 2 km indicates the current size of the nucleus, which is what we see today. For an initial radius of 2.23.0 km, slightly larger than today, the pressure inside the nucleus exceeds the compressive strength of the layers we see today.

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