What could trigger powerful quakes on icy world?

Imagine a planet orbiting a star some billions of lightyears away from us, the planet is 4 times the mass of Earth and is covered with ice 100km thick on average. It is believed that liquid ocean exist beneath that thick ice sheet and it could harbour life, any way I like to know how quakes can occur naturally on the ice without scarring the surface or through divine intervention?

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What could trigger powerful quakes on icy world?

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