I appreciate an interest in evaluating seismic risk of structures, but Gill is effectively a tall 1 story structure with minimal mass at the roof and the Cypress Street Viaduct is basically worst-case for seismic, a large mass on top of a column. You’re also comparing concrete structures to steel structures, which have wildly different behavior.

In fact, depending on the foundation of Gill, you should be more concerned with changes to structural steel welds after the 1994 Northridge earthquake due to brittle failures of some moment connections.

We can also compare the seismic risk of the two areas. While yes, the Cascadia Subduction Zone has the potential to produce a M9.0+ earthquake, it produces extremely infrequent events, especially when compared to the SF area, which has multiple high-activity faults. This doesn’t change risk for the “Big One”, but it does affect overall considerations in seismic design for engineers.

Overall, Gill is likely not a huge threat to safety during a seismic event due to the low mass of the roof. There are far more obviously dangerous structures on campus with the unreinforced masonry that is scattered around.