Immediately after the 1933 Long Beach earthquake , careful analysis of structural failures in that quake by architect Louis John Gill formed the basis for much of the California seismic legislation ( Field Act for schools and Riley Act for all buildings ) . The 1933 Riley Act required all California local governments to have a building department and inspect new construction , mandating that all structures in the state be designed to withstand a horizontal acceleration of 0.02 times the acceleration due to gravity
1933 Long Beach earthquake
1933 Long Beach earthquake
Seismic code