You know that 埋める is "to bury." This verb is to get buried or to be buried. You know this because it's more rare (もれる) to get buried than it is for you to bury someone else. Really you can only get buried once, to be honest, because you're probably going to die.
The reading comes from 埋める.
The snow piled up 30 centimeters deep last night and my car got buried.