Mezue ahịrịokwu na-esonụ: N'April 2013, otu ìgwè ndị ọkà mmụta banyere ala ọma jijiji na Georgia Institute of Technology nyochaghachiri data sitere na
Ala ọma jijiji nke afọ 2011 na Virginia site n'iji sọftụwia na-amata usoro wee chọpụta mmekọrịta dị n'etiti oke ifufe Hurricane Irene dị nso na mmụba a na-atụghị anya ya na ọnụ ọgụgụ nke aftershocks.