I don't even spec earthquake for pvp so meh.
My main spec for single shaman 3s doesn't spec into earthquake or rollingthunder/fulmination. I roll watershield lols.

Tremor is like a buff/nerf it's weird. Just going to have to stay on top of your grounding/shocks in 3s.
In 5s from a multi-boxing standpoint it might actually be a buff.
Purge mana cost was already pretty high, so this hurts. It is needed though dispels are pretty OP atm. Drop 20k health off your target in 1 button press on a 4 sham team.

Hopefully the buff to chain heal makes it worth keybinding again. Right now 4x healing rain is what I use. (Spiritwalkers + 4x Chain Heals is very nice in PVE during movement phases with aoe dmg).
I really hope they go back and consider 20% instead of 10% chain heal is pretty weak even for a fully spec'd resto shaman it's not
worth the mana cost.