Impossible.
Isn’t it?
Not really. A while back on a history channel show about engineering disasters they ran a segment about an earthquake and dam break in California.
Eventually it was determined that water from the lake behind the dam had seeped into a minor fault and the hydrostatic (?) pressure had cause the fault to slip leading to the dam break.
As you know, water is heavy. The canadian sheild is still rebounding from the weight of the last glaciers to cover the region.