Walk through Amos, verse by verse, with the great Bible Commentaries of Matthew Henry (1662 - 1714) & Adam Clarke (1760 - 1832)
8:8
Shall not the land tremble for this, and every one mourn that dwelleth therein? and it shall rise up wholly as a flood; and it shall be cast out and drowned, as by the flood of Egypt. KJV
{Whether on this thing, the earth shall not be moved together, and each dweller thereof shall mourn?
And it shall go up as all the flood, and shall be cast out, and shall float away, as the strand of Egypt.} Wycliffe's Bible
Shall not the land tremble for this - It is supposed that an earthquake is here intended, and that the rising up and subsiding as a flood refers to that heaving motion that takes place in an earthquake, and which the prophet here compares to the overflowing and subsiding of the waters of the Nile. But it may refer to commotions among the people.