George Haydock's Catholic Commentary
Psalms 17:16
Discovered. The earthquakes were so great, that such dreadful effects might have been expected. These phenomena sometimes make the sea retire, and new islands appear. (Pliny, [Natural History?] i. 84., and xxxi. 5., &c.) --- The Jews supposed that the sea was the common source of all fountains, and that the earth was founded on it, Psalm xxiii. 2., and Ecclesiastes i. 7. (Calmet)