中部
地震風險：高
Nagano Prefecture 地震風險
Nagano is landlocked but has multiple active faults and volcanoes. The Matsumoto Basin Eastern Margin Fault carries an M7.4 risk, and Mt. Ontake's 2014 eruption killed 58 hikers without adequate warning.
主要斷層・地震帶
Both the Itoigawa-Shizuoka Tectonic Line and the Matsumoto Basin Eastern Margin Fault run through Nagano Prefecture. Active volcano Mt. Ontake (Ontakesan) poses both volcanic earthquake and eruption risk. The 2014 Ontake eruption killed 58 hikers — always check JMA volcanic alert levels before mountaineering here.
主要斷層線
糸魚川-靜岡構造線 마쓰모토 분지 동연 단층 시오지리-마쓰모토 단층계