Kumamoto Prefecture (熊本県) — Earthquake Risk & History
Kyushu region · Based on HERP official data
The 2016 Kumamoto earthquake (M7.3, 273 dead) struck from the Futakawa-Hinagu fault system. The sequence featured two Intensity 7 events — a M6.5 foreshock followed two days later by the M7.3 main shock — a first in JMA history. Mt. Aso volcano is also located in the prefecture.
Fault Lines & Seismic Characteristics
Active Faults & Trenches
- Futagawa Fault Zone
- Hinagu Fault Zone
- Aso Outer Caldera Fault
Seismic Characteristics
The Futakawa Fault Zone and Hinagu Fault Zone run east–west across Kumamoto Prefecture. The 2016 M7.3 earthquake resulted from coordinated rupture of these two faults. Mt. Aso (Aso-san) in central Kumamoto adds volcanic earthquake and eruption risk.
Earthquake History
- M7.3
2016
Kumamoto earthquake — Intensity 7 main shock (including M6.5 foreshock on Apr 14); 273 dead; Kumamoto Castle partially collapsed
📖 Wikipedia
※ Showing M6.5+ or historically major events. Source: JMA database.
Future Probability — HERP Official Assessment
30-Year Probability (Official Figure)
Long-term evaluation by the Earthquake Research Committee. Fault assessment was updated after 2016. Key lesson: a foreshock can precede an even larger main shock — never return home prematurely after initial strong shaking.
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
- ✅ Kumamoto 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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2016 Kumamoto earthquake lessons: the main shock came second
The 2016 Kumamoto earthquake featured a M6.5 foreshock (Apr 14) followed by the larger M7.3 main shock (Apr 16) — a historically unprecedented double-Intensity-7 sequence in JMA records. This changed Japanese understanding of foreshock behavior.
Source: 규슈대학 지진화산연구소 (2018) -
Kumamoto Castle restoration status and Mt. Aso safety guide
Kumamoto Castle, severely damaged in 2016, has been progressively restored — the main tower reopened in 2021. Mt. Aso remains actively volcanic; some hiking routes and the Nakadake crater area may be restricted depending on JMA volcanic alert level. Always check the JMA Aso volcano page before visiting.
Source: 구마모토현 방재과·구마모토시 (2024)
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.