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🌊 Nankai Trough Earthquake Advisory — What to Do at "Caution" and "Warning" Levels

80% probability in 30 years — Essential preparedness for foreigners

80%
30yr Probability
M9
Max Magnitude
7
Max Intensity
2
Alert Levels

❓ What is the Nankai Trough earthquake?

A mega-earthquake expected at the plate boundary from Shizuoka to Kyushu. Estimated magnitude 8-9, max seismic intensity 7, with widespread tsunamis. The government rates the probability at 70-80% within the next 30 years.

🚨 Two levels of "Advisory Information"

⚡ Mega Earthquake Caution

Trigger: M7.0+ earthquake along the Nankai Trough

Action: Review earthquake preparedness for about 1 week. Confirm shelters & emergency kits. Continue daily life.

⚠️ Mega Earthquake Warning

Trigger: M8.0+ earthquake in half of the Nankai Trough (half-rupture)

Action: Evacuate for 1 week if in designated pre-evacuation zones. Areas where tsunami evacuation is impossible: evacuate immediately.

🗾 Expected affected areas

ShizuokaAichiMieWakayamaKochiMiyazakiOitaTokushimaEntire Pacific coast from Tokyo to Okinawa

✅ Prepare now

📱Install Safety Tips / NHK WORLD apps
🎒Prepare emergency bag (3 days water/food/meds/passport copy)
🏠Know your evacuation shelter (city website / disaster map)
👨‍👩‍👧‍👦Agree on contact methods & meeting points with family
🌊Check tsunami hazard map for home/workplace flood risk
📚Get multilingual leaflets (Cabinet Office disaster page)

👥 Special notes for foreigners

  • ●You can use shelters even if you don't speak Japanese — show an English card to staff
  • ●Keep copies of residence card & passport in your emergency bag
  • ●Save your embassy's emergency number on your phone
  • ●Always participate in workplace/school evacuation drills
  • ●Tsunamis arrive minutes after an earthquake — if near the ocean, go uphill immediately

💡 Key points to know

1"Advisory Information" is not a prediction — it means the risk has increased
2Review your preparedness within daily life — don't panic
3Nankai Trough earthquakes have occurred repeatedly (1944, 1946, etc.)
4Multilingual info for foreigners is available on Cabinet Office / JMA / NHK websites

Source:

Cabinet Office — Nankai Trough Advisory

🔗 Related Issues

🌧️
2026-05-01

Linear Rainband "Imminent Forecast" Launches

From the 2026 flood season, a new disaster weather system will forecast linear rainband formation 2–3 hours in advance. Enables earlier evacuation prep during rainy/typhoon season. Check multilingual app notifications.

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🌧️
2026-05-01

Linear Rainband Forecasts Now 2-3 Hours Ahead!

From May 2026, linear rainband prediction improves from 30 min to 2-3 hours ahead. Multilingual app alerts for foreigners. Life-saving info for rainy/typhoon season.

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🌊
2026-01-01

Earthquake Preparation Guide for Foreigners

Complete earthquake preparation guide for foreigners in Japan. Essential apps, emergency bags, and shelter locations explained in multiple languages.

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