Cool California.
I spent some time growing up in Lake and Mendocino counties. Nuts everywhere and picked nuts as a kid. We would watch the machinery much like you posted...They had long tongs, much like drum forks on a forklift, that would snatch a tree trunk and shake the nuts into a platform very similar to the one in your picture. You could actually feel the ground shake for the duration (about 30-45 seconds) from 30' away.
Most of the nut orchards are gone now....nearly all grapes and some Kiwi.
Mark