Is Earthquake Spell worth upgrading?

Is Earthquake Spell worth upgrading? Having an upgraded quake spell will allow you to do more damage to the buildings (other than storages) that are within the radius of the spell. While this may not be a lot more damage, on some of the tougher bases, the extra damage may be the difference in getting those buildings/defenses destroyed.

Having an upgraded quake spell will allow you to do more damage to the buildings (other than storages) that are within the radius of the spell. While this may not be a lot more damage, on some of the tougher bases, the extra damage may be the difference in getting those buildings/defenses destroyed.