The size of Olympus Mons suggests that the crust of Mars is very thick.

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Olympus Mons is a shield volcano on Mars that stands at about 22 km (13.6 mi) high, making it the tallest mountain in the solar system. The size of Olympus Mons suggests that the Martian crust is very thick, as it was able to support such a massive volcano without collapsing. Studies suggest that the crust of Mars is between 30-50 km (18.6-31 mi) thick, which is much thicker than the Earth's crust.

The Size of Olympus Mons Suggests That the Crust of Mars