Miyagi Prefecture (宮城県) — Earthquake Risk & History
Tohoku region · Based on HERP official data
Miyagi is the prefecture closest to the epicenter of the 2011 Great East Japan Earthquake. The entire Sendai Plain was inundated by tsunami, and the sea off Miyagi has a documented history of recurring M7+ earthquakes. The 30-year probability of an M7–8 earthquake off Miyagi exceeds 90%.
Fault Lines & Seismic Characteristics
Active Faults & Trenches
- Japan Trench
- Off Miyagi Fault Zone
Seismic Characteristics
The sea off Miyagi was closest to the epicenter of the 2011 M9.0 earthquake. The Pacific Plate continues to subduct beneath the North American Plate along the Japan Trench, accumulating stress. The Sendai Plain is flat, low-lying terrain — the 2011 tsunami penetrated more than 5 km inland, and future major events carry the same risk.
Earthquake History
- M9.0
2011
Great East Japan Earthquake — Sendai Plain extensively inundated; over 10,000 dead or missing within the prefecture
📖 Wikipedia - M7.4
2022
Fukushima–Miyagi earthquake — Tohoku Shinkansen train derailed; 200+ injured
- M7.4
1978
Miyagi-oki earthquake — widespread building damage across Sendai
※ Showing M7+ or Intensity 5+ events. Source: JMA database, Tohoku University Seismological Institute.
Future Probability — HERP Official Assessment
30-Year Probability (Official Figure)
Long-term evaluation by the Earthquake Research Committee. M7-class earthquakes have recurred off Miyagi on roughly a 37-year cycle. After 2011, the next cycle event requires continued vigilance.
Traveler Safety Information
Finding Evacuation Shelters
- ✅ Search "避難所" (hinanjo) on Google Maps to find the nearest shelter from your current location
- ✅ Install NHK World or Safety tips (Japan Tourism Agency app) — both send English earthquake alerts
- ✅ Miyagi Prefecture official disaster prevention page (Japanese) — includes shelter maps
Basic Action Rules
- ✅ At check-in, locate emergency exits and escape routes
- ✅ On strong shaking: protect your head, open a door to secure an exit, do not use elevators
- ✅ Near coasts or rivers: move to high ground immediately — do not wait for a tsunami warning
- ✅ Emergency numbers: Police 110 · Ambulance/Fire 119
- ✅ Contact your embassy in Tokyo for emergency consular assistance
Research & Official Sources AI summary
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Recurrence cycle of earthquakes off Miyagi
M7-class earthquakes have recurred off Miyagi on roughly a 37-year cycle. Small earthquakes have continued since 2011 as plate-boundary stress continues to accumulate.
Source: 일본 지진학회 (2022) -
Earthquake evacuation guide for Sendai visitors
Sendai's subway stops automatically during an earthquake. After reaching the surface, await official guidance. Some older buildings near Sendai Station may shed debris. If visiting the Matsushima coast, confirm tsunami evacuation routes before you go.
Source: 센다이시 방재안전과 (2023) -
Recovery of Sendai and Tohoku after 2011
Miyagi Prefecture lost over 10,000 people in the 2011 disaster. Large-scale seawall construction, inland relocation, and disaster-resilient community planning followed. Major tourist destinations including Sendai and Matsushima are fully operational; some sites near Higashimatsushima preserve remnants as memorials.
Source: 미야기현 부흥추진과 (2023)
Related Guides
Seismic characteristics and research summaries on this page are AI-generated from publicly available data by JMA, Cabinet Office, and HERP. Historical earthquake data (year, magnitude, damage) is based on official records, but key figures should always be cross-checked with the latest official sources. This page does not predict future earthquakes.