Yes, I know 4.1 hasn't hit yet, but I've ran ZG at least 4 different PTR patches and this has always been allowed to happen. About 3 mini patches ago, they added a new trash mob to ZA/ZG called Zandalaran Juggernauts. They have a self buff that allows their melee attacks to proc earthquakes. This procs pretty often afaik as a tank, too.
The exploit (I'm going to call it this because it's obviously not supposed to be this powerful) is for the mage to spell steal the buff he has. There's usually one in the pulls before Bloodlord. The most efficient use of this buff is to stand right behind the boss and start auto attacking, once it procs, it will leave an earthquake under the boss and you can go back to your normal rotation. It lasts about 15 seconds and if your auto attack is on, you will automatically melee following any cast, so you should constantly have earthquakes under the desired mob.
The quake ticks for ~20-25k/second, so it's a great addition to your dps rotation on any given boss.
Take this how you will, I know it's ptr and subject to change, but I have a feeling it will go live soon and this hasn't been changed in recent weeks.