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The Nankai Trough Earthquake

最終更新日:2020年12月15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 "ダウンロードのリンク 新規ウインドウで開きます。List of Designated Emergency Evacuation Sites(エクセル:360KB)".)

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:

  1. The oceanic plate in a trench descends slowly under the continental plate by a few centimeters per year.
  2. This movement pulls the edge of the continental plate down. The elastic strain energy around the plate boundary increases over time.
  3. 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

Earthquake measuring & 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.
Hanging items, such as lampshades, swing slightly

Level 3 Almost all people can feel tremors indoors. Dishes in cupboards clatter.
Level 4

People may feel very frightened.
Hanging items swing back and forth, dishes in cupboards clatter, and unstable items fall down.

Level 5 low Unstable items fall down, and windows may break.
Level 5 high

TV sets may fall down.
Concrete walls that are not reinforced fall over. Tombstones fall apart.

Level 6 low

In some buildings, walls, tiles, and windows come down.
Some wooden buildings with a low level of earthquake-proof construction may collapse.
The ground cracks and mountains landslide.

Level 6 high

In many buildings, walls, tiles, and windows come down.
Some concrete buildings with a low level of earthquake-proof construction may be destroyed.
The ground cracks and mountains landslide.

Level 7

Even buildings with earthquake-resistance are in danger of destruction.
Large cracks, gaps in the ground, and landslides may cause topographical changes.

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 "ダウンロードのリンク 新規ウインドウで開きます。Checklist for Emergency Kits(エクセル:34KB)" for a more detailed list of what to bring in an emergency bag.)

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総務課

〒770-8571 徳島県徳島市幸町2丁目5番地(本館6階)

電話番号:088-621-5021

ファクス:088-654-2116

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〒770-8571 徳島県徳島市幸町2丁目5番地

電話:088-621-5111(代表) ファクス:088-654-2116

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