Japan’s Nankai Earthquake – what is it? The Nankai Trough region faces an estimated 80% chance of a magnitude-9 “Big One” within 30 years, with potential casualties up to 300,000 people and economic losses exceeding ¥220 trillion. Whether you own a high-rise in Osaka or a wooden home in Shikoku, proactive measures can dramatically reduce damage—and save lives. Below, we outline what you can do before and during a major earthquake to protect your home, tenants, or investment. These guidelines draw on best practices from the Japan Meteorological Agency, the Fire and Disaster Management Agency, and leading disaster-prep experts.
How Can You Prepare Your Property (or Home) for a Nankai Earthquake?
1. Secure Furniture and Fixtures
Even with Japan’s rigorous building codes, unsecured furniture remains a major hazard. Anchor tall shelves, wardrobes, and TVs to the wall using L-brackets or tension rods. Install earthquake-resistant mats under appliances and place heavy items on lower shelves. Secure cabinet doors with latches to keep contents from flying out.
2. Build a Disaster-Ready Emergency Kit
Every household should have a well-stocked emergency bag with at least three days’ worth of water, food, medications, a flashlight, batteries, a radio, and important documents. Keep it close to where you sleep—earthquakes often strike at night. Add portable chargers, cash, and face masks, especially in densely populated urban areas. Be ready for the Nankai Earthquake and purchase ready-made ones here.
3. Assess and Upgrade Structural Safety
If you own or plan to buy older properties, especially wooden homes, have the structure assessed for seismic vulnerability. Retrofitting—such as reinforcing walls, securing foundations, or bracing roofs—can significantly reduce collapse risk. Check if the building complies with Japan’s latest earthquake-resistance standards (新耐震基準).
What Should You Do During and After the Nankai Earthquake?
1. Drop, Cover, and Hold On
If lucky, you will get an alarm sound from your phone. At the first sign of shaking, drop to the ground, cover your head and neck under a sturdy table, and hold on. If no furniture is available, sit against an interior wall away from windows and protect your head with your arms or a cushion.
If you’re within arms reach, cut off any open gas burners and other potential dangers to you and those around you.
2. Stay Put If You’re in Bed
If you’re already in bed when the quake begins, stay there. Roll to the floor only if it’s safe and quick to get under the frame. Otherwise, lie flat, face down, and shield your head with a pillow. Rushing outside during tremors can be more dangerous due to falling debris.
3. Inspect for Damage and Hazards
Once the shaking stops, check your home for signs of gas leaks (smell or sound), water damage, and structural cracks. Turn off utilities if you detect any danger. Do not use elevators, and avoid standing near exterior walls.
4. Help Others and Stay Informed about the Nankai Earthquake
After ensuring your own safety, check in with neighbors, especially those who are elderly or live alone. Tune in to emergency broadcasts via battery-powered radios or disaster apps. Be prepared for aftershocks and possible evacuation orders, especially in tsunami-prone areas. With a shock as big as the predicted Nankai Earthquake, there will most likely be aftershocks and other related disasters.
The Nankai Trough Earthquake could change everything in a matter of seconds—but with thoughtful preparation and a clear action plan, you can protect both your physical property and its long-term value.
At Nippon Tradings International, we help foreign investors make informed, resilient property decisions in Japan. If you’re investing in a home or portfolio here, let’s talk.
