It's called a dam break. Land upheavals happen all the time. One afternoon can change the whole contour of a Continent. We know Pangea broke up, we know mammoths died standing up with flowers in their stomachs, and we know the magnetic poles have swapped.
Gen: 10: 25
So you believe in continental drift, but not in geological time?
Can you please calculate the heat generated by moving a continent 1,000 miles in less than 6,000 years?