The earth is moved at the noise of their fall
Of the Edomites; whose fall was from the height of greatness and glory to a very low condition indeed; and as things, the higher they are from whence they fall, the greater noise they make, so it was with the Edomites; perhaps there may be some allusion to the falling of rocks and hills, with which Edom, abounded: this may respect either the noise and shout of the conquerors, when they fell; or the cry of the Edomites, when taken and destroyed; or the report of their destruction, when it came into the world; which struck the inhabitants of the whole earth with terror and amazement, so that they trembled at it; an hyperbolical expression, as Kimchi observes: at the cry, the noise thereof was heard in the Red sea,
or, "sea of Suph", or "weeds"; where weeds and rushes grew in great abundance, from whence it had its name. This is the Arabian gulf, which washed the shores of Edom, and was called the Red sea from thence, Edom signifying red. The meaning is, that the cry of the slain, or of the conquerors at the slaughter of them, should be heard to the borders of the land, to the sea shore, and by those in ships there; who should carry the report of it to each of the parts of the world.
The Brenton translation of the Septuagint is in the public domain.