Ka cika wannan jumla: Wani fasalin wurin da Kwarin Simi yake, kusa da Tuddan Simi, shi ne cewa yana cikin yankin da ke da haɗari sosai domin gobarar daji da ke cinye tuddan Kudancin California a kowace 'yan shekaru. Simi Valley kuma yana cikin haɗarin girgizar ƙasa. Kwarin yana kewaye da kuskuren; mafi kusa sune Santa Rosa Fault zuwa Arewa maso Yamma, da Northridge Hills Fault zuwa Arewa maso Gabas, da Chatsworth Fault zuwa Kudu. A 1994, sassan Simi Valley sun sami babbar lalacewa daga girgizar kasa.
Girgizar ƙasa ta Northridge. Duba Hadarin Nukiliya a SSFL don bayani game da hadarin da haɗarin haɗari ga mazauna.