There's been a Vulcanquake, but the artifact's been unkryptoned, but I want to know what on Mars is going on!

Okay, I made an off-handed remark about this before, but I thought I'd do more to explain it.

As a fan of science fiction stories, there's always been something that's bothered me, namely the continued usage of the word "earth" to mean planet, even when spoken by aliens.

In these shows we constantly hear things like "there's been an earthquake" when they're on another planet, "we've unearthed the doohickey" when they have dug up something from an alien planet" or even a character saying "what on earth" when they are not on earth.

It's not a big deal, but if you're on the planet Vulcan and the ground shakes, wouldn't it be a Vulcanquake or at least an groundquake? And if you're doing an archeology dig on Krypton, wouldn't you end up unkryptoning the artifact? And if you see a weird alien, wouldn't it be kind of silly to say "what on Earth" when there is nothing like it on Earth?

I just think that when we do venture to other planets and meet aliens, they're not going to say things like this, if they do have similar sayings, then I'm sure they'd mention their planet's name and not ours.

Again, it's a miniscule thing, but it is a pet peeve.