The Structural Engineers Association of California (SEAOC) is an authoritative world leader in the practice of structural and earthquake engineering, a nationally influential participant in structural code and standard development, and a valuable resource to practicing structural engineers. Learn more. 

SEAOC comprises four regional member organizations: 
Structural Engineers Association of Central California (SEAOCC)
Structural Engineers Association of Northern California (SEAONC)
Structural Engineers Association of Southern California (SEAOSC)
Structural Engineers Association of San Diego (SEAOSD)