Nagasaki Prefecture (長崎県) — Earthquake Risk & History
Kyushu region · Based on HERP official data
Nagasaki's intricate ria coastline and hundreds of islands make tsunami behavior complex. The 1792 Shimabara Catastrophe — a volcano-induced landslide tsunami killing ~15,000 — remains Japan's deadliest volcanic compound disaster. Unzen volcano continues to be monitored.
Fault Lines & Seismic Characteristics
Active Faults & Trenches
- Genkai-nada Fault
- Iki–Tsushima Fault Zone
Seismic Characteristics
Nagasaki Prefecture features complex ria coastlines and hundreds of islands. The Shimabara Peninsula hosts Unzen volcano, which carries volcanic earthquake risk. The 1792 Shimabara Catastrophe combined volcanic activity with earthquake and landslide-induced tsunami, killing ~15,000. Genkainada and Iki-Tsushima Fault Zone affect the northeast.
Earthquake History
- M6.4
1792
Shimabara Catastrophe — volcanic landslide caused massive tsunami; ~15,000 dead (Japan's deadliest volcanic disaster)
- M7.0
2005
Fukuoka earthquake — Intensity 3–4 observed in northern Nagasaki
- M5.8
1991
Unzen volcanic eruption-related seismicity — volcanic earthquakes; 43 dead in pyroclastic flows
※ Showing M6+ or historically significant events. Source: JMA database.
Future Probability — HERP Official Assessment
30-Year Probability (Official Figure)
Long-term evaluation by the Earthquake Research Committee. Historical precedent (1792 Shimabara) for compound volcano-earthquake-tsunami events. Check JMA volcanic activity level before visiting Unzen.
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
- ✅ Nagasaki 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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Shimabara volcano, earthquake, and compound tsunami disaster
The 1792 Shimabara Catastrophe is one of history's most destructive compound volcano-earthquake-tsunami events. Nagasaki Prefecture uses this precedent in compound disaster preparedness planning.
Source: 나가사키현 방재과 (2020) -
Earthquake and volcano guidance for Nagasaki, Huis Ten Bosch, and Unzen visitors
Nagasaki city and Huis Ten Bosch (Sasebo) are safe to visit. Unzen volcano has been relatively stable since 1990–95, but check JMA volcanic activity level before visiting. Nagasaki's hilly terrain carries landslide risk during earthquakes. For Tsushima and Goto islands, be aware of East China Sea earthquake potential and confirm evacuation routes.
Source: 나가사키현 방재과 (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.