When the glaciers on the modern UK melted away the entire regional landmass lifted up by hundreds of feet as the weight of kilometer+ thick ice was removed.
If you're looking at mass and force acting on fault prone areas then the addition or removal of significant pressure will have an effect on slippage and lead to changes in earthquake frequency.
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What scale of change and where?
When the glaciers on the modern UK melted away the entire regional landmass lifted up by hundreds of feet as the weight of kilometer+ thick ice was removed.
If you're looking at mass and force acting on fault prone areas then the addition or removal of significant pressure will have an effect on slippage and lead to changes in earthquake frequency.