It would take an external force many times as large as the earthquake to approach the design strength of the concrete itself. This represents earthquake forces in excess of the most sever code requirement by a factor of 1.4. For a vertical live load of 40 psf in addition to the dead load of the shell the following stresses and moment are obtained. This is many times greater than the -70.6psi needed. The forces caused by a major earthquake are considerably less than normal provided for when a dome is designed for nominal vertical loads.
Nuclear fallout is another disaster consideration.
It is interesting to note that the only structure left standing near ground zero at Hiroshima was the concrete skeleton of a dome. Rain would tend to wash the radiation off the building much better than conventional buildings. Radiation strengths are inversely proportional to the square of the distance from the source. Also concrete itself is a good absorber of radiation. It is interesting to note that German thin shell structures stood up to allied bombing in the second world war better than most other structures.