近畿
地震風險：very-high
Osaka Prefecture 地震風險
Osaka faces a dual threat: the Uemachi Fault Zone's M7.5 direct earthquake and the Nankai Trough megaquake (70–80%). The 2018 Osaka North earthquake (M6.1) demonstrated how even a moderate event can paralyze Japan's second-largest city.
主要斷層・地震帶
The Uemachi Fault Zone runs north–south through central Osaka — Osaka Castle sits directly on this fault. A Nankai Trough earthquake would send tsunami into Osaka Bay and flood the city's extensive underground network of subway stations and underground shopping malls. The 2018 Osaka North earthquake (M6.1) originated on a different fault from Uemachi.
主要斷層線
우에마치 단층대 생마 단층대 南海海槽（間接）