Keyword Rankings: One keyword dropped, dragging other rankings down. Possible or not?

[Kokolo]

Hey moz fans,

So these week I noticed significant drop in rankings...

But what caught my attention is that one specific keyword dropped 18 positions, and all the other just 1-3.

Print screen: http://prntscr.com/7fb4g4

Do you think it's possible that the drop of that page, that went 18 positions down, brought the whole domain down?

Or is it another cause?

[TomRayner]

Hi Nikola

It certainly won't be the case that, if you have a big rankings drop, that might have a ripple effect on other rankings.  There's no way the two will be directly related and Google won't adjust your other rankings because of one falling.

However, the reason behind the ranking drop might well have contributed to other keywords falling, particularly if they are related keywords.  So, if a competitor has had a successful link building campaign and risen above you, you yourself have lost links, made onsite changes etc etc.  Those ranking factors can all increase or decrease your keyword positioning - and if all of your keywords are related and possibly ranking for the same page, that might explain why other keywords have fallen as well.