Which earthquake prompted the installation of 9" diameter walls?

The Long Beach earthquake, which occurred in 1933, played a significant role in reshaping building codes and construction standards in California, particularly regarding seismic safety. This earthquake highlighted the vulnerabilities of buildings to seismic activity, leading to increased awareness and the need for more stringent construction practices to ensure safety during such events.

In response to the damage and destruction caused by the Long Beach earthquake, engineers and architects began to implement new designs that included features such as 9-inch diameter walls. The intent was to enhance the structural integrity of buildings, allowing them to withstand the forces exerted during an earthquake. Such measures became a part of evolving building codes aimed at reducing the risk of collapse and protecting citizens during seismic events.

This design choice reflects a crucial turning point in earthquake preparedness standards, emphasizing how specific earthquakes can directly influence architectural design and public safety regulations.