@AbuHajaar Underground containment facilities built from the ground up to withstand earthquakes and nuclear attacks do not translate to a "containment sphere" that prevents earthquakes from affecting a house NOT built to withstand earthquakes.
The seismic activity would still be transfered into the sphere itself, as long as any part of that "sphere" you proposed is touching the earth, it's vulnerable. The only way to prevent a terrestrial object from being affected by earthquakes with non-Type Blue+ tech or anything like that, would be completely suspending the object in question in multiple suspended cells with high shock absorption. Because again, the house itself is not built to withstand earthquakes. And even that would not completely nullify all vibrations without extensive construction, as well as the failure of any of the systems would cause a massive XK event. Which still leaves the classification as Keter.
AND that's assuming the house even survives the initial construction phase, unless the Foundation still has theoretical and empirical knowledge of advanced construction methods that are far ahead the current tech behind the Scrantons, that prevents the vibrations from digging and excavating from affecting the house, you know LIKE AN EARTHQUAKE DOES.
AND that's also assuming the house can even be moved without affecting the space within the attic. All evidence so far shows that physical interactions of the house that involve the attic, does transfer into the real galaxy as well. What's going to happen if we move the house? "Picking up" and moving a house is essentially subjecting it to a small earthquake. That's literally incident 100-2.
Your proposals would have the SCP be subjected to events that are no different than current natural disasters, for the purpose of preventing natural disasters from affecting the SCP. If the SCP causes an XK event in the process of more secure containment measures, that's far too great a risk. Unless you're aware of a method to transport an object into a null-space, or enter perfect stasis, current containment procedures still stand, as does the classification.