Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
quran:79:34

But when there comes the greatest Overwhelming Calamity -  

So when the Greatest Catastrophe befalls — the second blast —
القرآن:٧٩:٣٤

فَإِذَا جَاءَتِ الطَّامَّةُ الْكُبْرَىٰ  

{فإذا جاءت الطامة الكبرى} النفخة الثانية.