Charles Ellicott Commentary Genesis 6:11

"And the earth was corrupt before God, and the earth was filled with violence." — Genesis 6:11 (ASV)

The earth. —This is the larger word, and it occurs no less than six times in these three verses, thus indicating a more widespread calamity than if adâmâh only had been used, as in Genesis 6:7. But the earth that was corrupt before God was not the whole material globe, but that part which man, notably the gibborim of Genesis 6:4, had filled with violence. Wherever man’s violence had spread, there his home and all his works, his built cities, his tilled land, his cattle and stores, must be entirely swept away. An absolutely new beginning was to be made by Noah, such as Adam had to undertake when he was expelled from Paradise. The reason for this necessity is given next.