Are these Mountain-Flattening, island-removing "great" earthquakes the same event?

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Since, in both of these accounts of what I will call “The Great Earthquake”, there will no longer be any mountains, and also, all islands will be completely gone — Are these accounts of the same earthquake?

Revelation 16:18-20 (NASB)

18 And there were flashes of lightning and sounds and peals of
thunder; and there was a great earthquake, such as there had not been
since mankind came to be upon the earth, so great an earthquake was
it, and so mighty. 19 The great city [a]was split into three parts,
and the cities of the [b]nations fell. Babylon the great was
remembered in the sight of God, to give her the cup of the wine of
[c]His fierce wrath. 20 And every island fled, and no mountains were
found.

Revelation 6:12-17 (NASB)

The Sixth Seal: Terror

And I looked when He broke the sixth seal,
and there was a great earthquake; and the sun became as black as
sackcloth made of hair, and the whole moon became like blood; 13 and
the stars of the sky fell to the earth, as a fig tree drops its unripe
figs when shaken by a great wind. 14 The sky was split apart like a
scroll when it is rolled up, and every mountain and island was removed
from its place. 15 Then the kings of the earth and the eminent people,
and the commanders and the wealthy and the strong, and every slave and
free person hid themselves in the caves and among the rocks of the
mountains; 16 and they *said to the mountains and the rocks, “Fall on
us and hide us from the [a]sight of Him who sits on the throne, and
from the wrath of the Lamb; 17 for the great day of Their wrath has
come, and who is able to stand?”