Debacle

\dey-BAH-kuhl\ means
..........a sudden and violent collapse
...............a breaking up of ice in a river
....................overwhelming disaster

Related terms: ruin, fiasco, catastrophe, calamity

Example1.
An intensity 8 earthquake caused most of the huge buildings to collapse within seconds that it put everybody in shock and disbelief. It was such a debacle which I haven't seen in a long time.
Example2.
I never knew that the breaking of ice in a river just like what was shown in the movie Narnia, is also called a debacle until I included this word in Logofanum.

dictionary.com page link for debacle