Wakayama Prefecture (和歌山県) — Earthquake Risk & History
Kinki region · Based on HERP official data
Wakayama's southern Kii Peninsula faces the Nankai Trough directly — some coastal areas would receive tsunami within 5 minutes of rupture. The 1854 "Inamura no Hi" (rice sheaves fire) story from this coast has become a symbol of tsunami preparedness worldwide.
Fault Lines & Seismic Characteristics
Active Faults & Trenches
- Nankai Trough
- S Kii Peninsula Fault
Seismic Characteristics
The Nankai Trough passes just south of Wakayama Prefecture. The southern Kii Peninsula is one of Japan's closest land areas to the Nankai Trough — tsunami arrival within 5 minutes is expected at some coastal points. The 1854 "Inamura no Hi" story — in which a village headman burned his rice sheaves to guide villagers to high ground — originated in what is now Hirogawa Town, Wakayama.
Earthquake History
- M8.0
1946
Nankai earthquake — tsunami struck Kii Peninsula; fishing communities severely damaged
- M8.4
1854
Ansei Nankai earthquake — widespread tsunami across the Kii Peninsula
※ Showing M7+ or historically major tsunami events. Source: JMA database.
Future Probability — HERP Official Assessment
30-Year Probability (Official Figure)
Earthquake Research Committee 2023 assessment. Southern Kii Peninsula is one of Japan's fastest tsunami arrival zones. Evacuate immediately upon strong shaking — without waiting for warnings.
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
- ✅ Wakayama 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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Nankai Trough and Kii Peninsula tsunami risk
Wakayama's southern coast is among Japan's fastest and highest tsunami zones from a Nankai Trough event. Some areas could see waves exceeding 20 m arriving within minutes of rupture.
Source: 내각부 중앙방재회의 (2022) -
Tsunami evacuation guidance for Wakayama, Kumano Kodo, and Shirahama
Shirahama Beach is a low-lying coastal area — tsunami could arrive within 5–8 minutes of a Nankai Trough earthquake. Move to high ground immediately upon strong shaking without waiting for warnings. The Kumano Kodo passes through multiple coastal zones — confirm tsunami evacuation tower locations at each stopping point. Always verify evacuation routes at accommodation check-in.
Source: 와카야마현 방재과·시라하마정 (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.