東北
地震風險：very-high
Iwate Prefecture 地震風險
Iwate was among the hardest-hit prefectures in the 2011 Great East Japan Earthquake. The Sanriku rias coast funnels and amplifies incoming tsunamis, producing extreme wave heights in narrow bays. The probability of a major earthquake recurring off the Sanriku coast within 30 years is very high.
主要斷層・地震帶
Iwate's Pacific coast is a classic rias coastline — deep, narrow inlets that concentrate and amplify tsunami energy, repeatedly producing outsized wave heights relative to the originating quake. The Japan Trench runs close offshore, generating M7–9 plate-boundary earthquakes on a recurring cycle. The prefecture has experienced major tsunamis in 1896, 1933, 1960, and 2011.
主要斷層線
日本海溝 산리쿠 단층대