Pedzisa mutsara unotevera: Chimwe chinhu chinoita kuti Simi Valley ive pedyo neSimi Hills ndechokuti iri munzvimbo ine ngozi zvikuru pamoto unoparadza makomo ari kuSouthern California makore mashoma oga oga. Simi Valley inewo ngozi yokudengenyeka kwepasi. Mupata wacho wakapoteredzwa nemapako; ari pedyo zvikuru ari Santa Rosa Fault kuchamhembe kwakadziva kumadokero, Northridge Hills Fault kuchamhembe kwakadziva kumabvazuva, uye Chatsworth Fault kumaodzanyemba. Muna 1994, zvikamu zveSimi Valley zvakaparadzwa zvikuru ne
Kudengenyeka kweNorthridge. Ona Tsaona Yenyukireya paSSFL nokuda kwemashoko pamusoro penjodzi nenjodzi yakabatana (s) kuvagari.