The global flood caused such catastrophies. There were earthquakes, volcanos. The earth opened up underground floods as well as the torrents from above the earth. Genesis tells us that above the whole earth was a firmament of water and that it had never rained on the earth until the flood. The tremendous action of all these things happening at the same time caused things on the earth to happen and develop very quickly. I am no expert and cannot explain it as well as AIG. I suggest you read their material and watch their videos. As far as I am concerned it is very conclusive to me.
