This weakaura will scream at you if your CURRENT cast will be interrupted by the Quaking affix in Mythic+ dungeons.
If your current cast will get interrupted, it'll play an unmissable sound+visual alert.
This weakaura still works even if your current cast starts after the 'quaking cast' starts. So with this weakaura you can try to be greedy and keep casting during Quaking, and just backoff if you've been too greedy and the interrupt alert pops up.
You should never get interrupted by Quaking when using this weakaura - and it should make it easier to 'play greedy' to keep casting during quaking casts, without being interrupted.