﴿ فَأَمَّا ثَمُودُ فَأُهْلِكُوا۟ بِٱلطَّاغِيَةِ ﴾

“Now as for the Thamud - they were destroyed by a violent upheaval [of the earth];”

(As for Thamud, they were destroyed by the lightning) they were destroyed because of their transgression and idolatry; and it is said that their transgression drove them to disbelieve until they were destroyed.