Megafault (2009)

An extremely sickly looking Brittany Murphy stars as a seismologist who has a theory about a megafault lying under the middle of the US. When a massive earthquake starts moving along this fault, Brittany gives a few words of advice, checks out the scene, and then spends the majority of the movie concentrating on the safety of her own family. She also has a fondness for the explosives expert she saved from the origin site of the earthquake, and the two use all her resources to try to save his mother as well as her family. So much for misuse of government resources.

As the quake travels across the plains with nothing to stop it, Brittany and the explosives guy attempt to use his knowledge to create a twenty five mile canyon which will hault the quakes progress.

The quake also causes a super volcano to surge under the ground, melting peoples shoes and eventually their heads. Oddly enough their clothes are intact until after their head melts.

Brittany's husband and child are given special treatment and are flown home on a military plane. The plane crashes, but somehow both end up wandering out of the woods alive. In keeping with the family tradition of self absorbtion, they do not make any attempt to check if the the pilots managed to survive also. Later husband and daughter hitch a ride with a trucker carrying a rig full of oil which is unfortunate since they're near the dreaded super volcano and must outrun the faultline which threatens to blow up the rig. The brilliant plan to unhitch the rig works.  But in it's post-explosive cgi glory rolling down the road,  if you'd replaced it with a cgi dinosaur on fire it would have looked very similar.

I don't know whether it was the makeup, or if Brittany was very ill or hopped up on goofballs, but her appearance is very distracting.  She does not look well.