Tafsir of At-Tur 52:9

On the Day when Tamur the heaven Mawr, Ibn Abbas and Qatadah said: "Shaking violently.'' Also from Ibn Abbas, "Split.'' Mujahid said: "Spin violently.'' Ad-Dahhak commented on the Ayah, saying, "The earth will violently spin and move by the command of Allah, and its areas will violently move towards each other.'' This was preferred by Ibn Jarir, because of the meaning of the word, Mawra, which denotes meanings of spinning and shaking. Allah said,

وتسير الجبال سيرا