Amos 9

The Lord, the Lord Almighty—
he touches the earth and it melts,
    and all who live in it mourn;
the whole land rises like the Nile,
    then sinks like the river of Egypt;
6 he builds his lofty palace[a] in the heavens
    and sets its foundation[b] on the earth;
he calls for the waters of the sea
    and pours them out over the face of the land—
    the Lord is his name. vv.5-6

Read chapter 9
After Amos has declared this judgement of the Lord on Israel, he reminds them how great their God is and the confirmation of it.  "The least token of God’s displeasure is sufficient to put the whole frame of nature out of order" Benson's Commentary. That just by His touch the earth can melt.  That He sits on high and controls the elements of the earth.  He that has power over the unlimited natural resources of the earth can surely do what He has denounced upon Israel through Amos.  The book of Amos may be hard to take, assuming God is unfair and horrible, but it's because we want God to play favorites.  To show only enemies His judgement and not His people who have sinned greatly does make God to be unfair and hypocritical.  "Therefore, the message of this book can have the impact of a sudden fist in the face. If you really think that you are in a privileged position, especially with God, this book comes with brutal, shocking, breath-taking force. The tendency in human hearts is either to regard ourselves as favored individuals or the exact reverse -- to say that we are such poor creatures and such miserable failures that God would never look at us, that other people have all the right to God' s favor. I think this tendency is universal among us. We are always saying to ourselves, 'Why should this happen to me?' when tragedy strikes, or when someone else is honored, we say, 'Why shouldn't it happen to me?'" (Raystedmand.org; Bible expositor).
This judgment doesn't last forever as we see the last half of this same chapter of how God will restore Israel.