1 You have rejected us. See Pss 43:2; 44:9, 23.
2 Heb “you broke out upon us, you were angry.”
3 The imperfect verbal form here expresses the psalmist’s wish or prayer.
4 The verb פָּצַם (patsam, “split open”) occurs only here in the OT. An Arabic cognate means “crack,” and an Aramaic cognate is used in with the meaning “break open, frame.” See 822 and 1205 פְּצַם. You made the earth quake; you split it open. The psalmist uses the imagery of an earthquake to describe the nation’s defeat.
5 It is ready to fall. The earth is compared to a wall that has been broken by the force of the earthquake (note the preceding line) and is ready to collapse.

In other versions

O God, you have rejected us, broken our defenses;

you have been angry; oh, restore us.

You have made the land to quake; you have torn it open;

repair its breaches, for it totters.

You have rejected us, God, and burst upon us;

you have been angry—now restore us!

You have shaken the land and torn it open;

mend its fractures, for it is quaking.

God, you have rejected us;

you have broken us down;

you have been angry. Restore us!

You have shaken the land and split it open.

Heal its fissures, for it shudders.

You have rejected us, O God, and broken our defenses.

You have been angry with us; now restore us to your favor.

You have shaken our land and split it open.

Seal the cracks, for the land trembles.

O God, you have rejected us. You have broken us.

You have been angry. Restore us!

You have made the land quake. You have split it open.

Heal its fissures, because it totters.

O God, thou hast cast us off, thou hast scattered us,

Thou hast been displeased; O turn thyself to us again.

Thou hast made the earth to tremble; thou hast broken it:

Heal the breaches thereof; for it shaketh.

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