The day the convulsive (first blast) shatters convulsively
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Tafseer
'Abdullāh Ibn 'Abbās / Muḥammad al-Fīrūzabādī
تفسير : so allah said: (on the day when the first trump resoundeth) this refers to the first blowing of the trumpet when everything will quake.
Jalāl al-Dīn al-Maḥallī
تفسير : the day when the tremor quakes, that is to say, the first blast, as a result of which everything will be shaken violently (thus it [the subject] has been described in terms of the effect it produces),