The Doctrine and Covenants, Section 84:114-115
114 Nevertheless, let the bishop go unto the city of New York, also to the city of Albany, and also to the city of Boston, and warn the people of those cities with the sound of the gospel, with a loud voice, of the desolation and utter abolishment which await them if they do reject these things.
115 For if they do reject these things the hour of their judgment is nigh, and their house shall be left unto them desolate.
Doctrine and Covenants Student Manual, Section 84
[W]hile you stand in the towers of the Temple and your eyes survey this glorious valley filled with cities and villages, occupied by tens of thousands of Latter-day Saints, you will then call to mind this visitation of President Young and his company. You will say: That was in the days when Presidents Benson and Maughan presided over us; that was before New York was destroyed by an earthquake; it was before Boston was swept into the sea, by the sea heaving itself beyond its bounds; it was before Albany was destroyed by fire; yea, at that time you will remember the scenes of this day. Treasure them up and forget them not.’ President Young followed and said: ‘What Brother Woodruff has said is revelation and will be fulfilled.’
Journal of Discourses, Brigham Young 8:30
“Do you think there is calamity abroad now among the people?” Not much. All we have yet heard and all we have experienced is scarcely a preface to the sermon that is going to be preached. When the testimony of the Elders ceases to be given, and the Lord says to them, “Come home; I will now preach my own sermons to the nations of the earth,” all you now know can scarcely be called a preface to the sermon that will be preached with fire and sword, tempests, earthquakes, hail, rain, thunders and lightnings, and fearful destruction. What matters the destruction of a few railway cars? You will hear of magnificent cities, now idolized by the people, sinking in the earth, entombing the inhabitants. The sea will heave itself beyond its bounds, engulfing mighty cities. Famine will spread over the nations, and nation will rise up against nation, kingdom against kingdom, and states against states, in our own country and in foreign lands; and they will destroy each other, caring not for the blood and lives of their neighbors, of their families, or for their own lives.