Tafsir of Hud 11:67

According to Tafsir al-Qurtubi, these three days were Thursday, Friday and Saturday. On Sunday, the punishment descended upon them: وَأَخَذَ الَّذِينَ ظَلَمُوا الصَّيْحَةُ (And those who transgressed were caught by the Cry - 67). This awesome Cry was that of the archangel, Sayyidna Jibra'il (علیہ السلام) which was far more terrorizing that the combined thun¬derbolts of worldly lightening could ever be, something human senses could not take. All hearts were rent apart by the horrific sound result¬ing in the mass destruction of those people.

From this verse we learn that the people of Sayyidna Salih (علیہ السلام) were destroyed by a severe Sound, but what Surah al-A` raf says about them is: فَأَخَذَتْهُمُ الرَّ‌جْفَةُ (So, the earthquake seized them - 7:78, 91) which, as obvious, tells us that the punishment visiting them was that of the earthquake. Commentator al-Qurtubi has said that there is no contradiction here. It is possible that the earthquake came first and then they all were destroyed by the severe Sound. Allah knows best.