Malbim: The evils that they did to Yisrael.

Rashi: It will be voices and thunder like it says ¹ .

Radak: Eretz Yisrael will shake. So it says in Zecharyah (14:4-5) "v'Nivka Har ha'Zeisim?; v'Nastem Gei Harai? Ka'asher Nastem Mipnei ha'Ra'ash bi'Ymei Uziyah Melech Yehudah."

Malbim: It will be due to Evrah that will spread over the Klal (even those who did not sin).

Malbim (20) #1: It is an earthquake ? "v'Nastem? Mipnei ha'Ra'ash" (Zecharyah (14:5).

Malbim (20) #2: This is a metaphor for the great war and noise of cannons and weapons that will be at the end of days, that destroy mountains and fortified walls with awesome noise.