Mezue ahịrịokwu na-esonụ: Ihe mgbaru ọsọ kasịnụ nke ọrụ ahụ bụ imeziwanye nchebe seismic nke corridor. Mgbe ala ọma jijiji Loma Prieta nke 1989 gasịrị, Ngalaba Na-ahụ Maka Ụgbọ njem na California (Caltrans) malitere Usoro nke 1 nke usoro mmezi seismic ya. Mgbe ndị
1994 Northridge ala ọma jijiji, Caltrans bidoro usoro nke abụọ nke usoro mmezi ala ọma jijiji ya, nke gụnyere ọrụ dị n'okporo ụzọ I-880. Ihe mgbaru ọsọ ndị ọzọ na-agụnye ibelata mkpọchi okporo ụzọ na imeziwanye àgwà okporo ụzọ.