The Nankai Trough Earthquake
最終更新日：2022年9月1日
Japan is one of the most earthquake-prone countries in the world.
The Nankai Trough Earthquake is expected to be one of the biggest earthquakes to strike Japan. Tokushima City is predicted to be damaged heavily when it strikes. Be prepared for such an earthquake, stay informed about such disasters, and learn how to evacuate when there is danger of a tsunami. Please identify your emergency evacuation sites and high ground evacuation sites designated by Tokushima City, and make sure you know how to get to them. (Refer to the "List of Designated Emergency Evacuation Sites（PDF形式：1,237KB）".)
About earthquakes
How an earthquake happens
Most earthquakes happen as the result of movements within the earth’s crust.
How an inter-plate (trench type) earthquake occurs:
- The oceanic plate in a trench descends slowly under the continental plate by a few centimeters per year.
- This movement pulls the edge of the continental plate down. The elastic strain energy around the plate boundary increases over time.
- When the stress reaches its limit, the continental plate springs up, causing an earthquake. This movement may also cause a tsunami.
Damage caused by earthquakes
There may be large-scale damage such as buildings collapsing or cracks in the road. Earthquakes also often cause fire, tsunami and other damage.
When a big earthquake strikes, essential services, such as electricity, water, gas, communication services, and transportation, may not be accessible. After a disaster, it is possible that you may have to live in this condition for an extended period of time.
Earthquake measuring (on the Japanese scale) & estimated damage
| Seismic intensity | Supposed damage and situations |
|---|---|
| Level 0 | Nobody can feel tremors |
| Level 1 | Some people can feel tremors indoors. |
| Level 2 | Many people can feel tremors indoors. |
| Level 3 | Almost all people can feel tremors indoors. Dishes in cupboards clatter. |
| Level 4 | People may feel very frightened. |
| Level 5 low | Unstable items fall down, and windows may break. |
| Level 5 high | TV sets may fall down. |
| Level 6 low | In some buildings, walls, tiles, and windows come down. |
| Level 6 high | In many buildings, walls, tiles, and windows come down. |
| Level 7 | Even buildings with earthquake-resistance are in danger of destruction. |
Earthquake preparedness
- Check the condition of your concrete walls, and identify objects that might be in danger of falling on the roads you use regularly.
- Keep a fire extinguisher.
- Secure furniture and other objects with braces to prevent them from toppling.
- Keep at least 7 days’ worth of food and water stocked. (An average person needs 3 liters of water a day.)
- Prepare your own emergency bag.
Emergency bag
- An emergency bag should include all of the necessary items, but should be compact and light enough to be carried easily in the event of an evacuation.
- The best kind of emergency bag is a backpack which enables your hands to be free.
- Each family member should have his/her own emergency bag.
(Refer to the "Checklist for Emergency Kits（PDF形式：32KB）" for a more detailed list of what to bring in an emergency bag.)
PDF形式のファイルを開くには、Adobe Acrobat Reader DC（旧Adobe Reader）が必要です。
お持ちでない方は、Adobe社から無償でダウンロードできます。
Adobe Acrobat Reader DCのダウンロードへ
この情報はお役に立ちましたか？
お寄せいただいた評価はサイト運営の参考といたします。
