Kammala wannan jumla: Yawancin bala'i masu yawa sun haifar da kalubale na kudi ga Inshorar Manoma. Girgizar kasa ta San Francisco a shekara ta 1989, da gobarar Oakland a shekara ta 1991, da
Girgizar kasa ta 1994 a Northridge, California, ita ce babbar bala'i guda uku. An kiyasta cewa asarar da girgizar Northridge ta yi ita kaɗai ta kai dala biliyan ɗaya da miliyan ɗari uku.