The first sign of the Hour is Earth's collapse.
(Mukhtasar Tazkirah al-Qurtubi, p. 518)

When the latter generations of these people insult the former ones, expect red winds, Earth's collapse, or the raining of stones from the heavens. (Tirmidhi)

At the End Times, when entertainment and dancers pervade and drinking is considered permissible, Earth will collapse, stones will pour [from the sky], and people will strip off their humane qualities.
(Ahmad Diya'al-Din al-Kamushkhanawi,
Ramuz al-Ahadith, vol. 2, p. 302, no. 8)