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Earthquake Prevention

Seismic Intensity Scale
Intensity Strong Ground Acceleration
Effects on People Effects Indoors Effects Outdoors
0 Micro below 0.8 gal Not felt.    
1 Very minor 0.8-2.5 gal Felt only by a few people at rest, vibrates slightly.    
2 Minor 2.5-8.0 gal Felt by the majority of people. Some awakened from sleeping. Hanging lamps and objects vibrate slightly. Standing vehicles vibrate slightly, similar to being passed by a truck, but only lasts for a short time.
3 Light 8.0-25 gal Felt by nearly everyone, a few frightened. Buildings shake; dishes, windows, and doors shake making sounds; hanging objects shake visibly. Standing vehicles vibrate obviously; electric wires sway gently.
4 Moderate 25-80 gal Many people are quite frightened, looking for safe shelter. Most people are awakened from sleep. Buildings rock noticeably; unstable objects topple over; heavy furniture moves; may cause slight damage. Felt by drivers; electric wires sway obviously, felt by people walking.
5 Strong 80-250 gal Most people are considerably frightened. Walls crack; heavy furniture may overturn. Noticeably felt by drivers; some chimneys and large archways topple over.
6 Very strong 250-400 gal People have trouble walking due to violent rocking. Damage to some buildings; heavy furniture overturns; doors and windows bend. Drivers have trouble steering; sand and clay blasts occur.
7 Great 400 gal and above People move with difficulty due to severe rocking. Severe damage to or collapse of some buildings; almost all furniture moves or falls down. Landslides and faults rupture occur; railway bend; underground lines break.

Before earthquake

  • Learn how to turn on and shut off gas, tap-water, and electricity valves.
  • Keep hanging objects firmly secured; lock up the cabinet tight.
  • Do not place weighty objects on high shelves; secure heavy furnishings.
  • Secure a shelter in advance.
  • Fire equipment should be examined regularly.

During earthquake

  • Keep calm and immediately shut off electricity, gas, and tap-water.
  • Protect yourself from falling objects such as signs or potted plants.
  • If you are in the suburbs, avoid cliffs, riversides, and shores, and move to a clear area.
  • Do not try to rush out of a building; do not use elevators.

After earthquake

  • Check if people near you are hurt and give necessary first aid.
  • Turn on the radio for emergency instructions and disaster reports.
  • Better to wear shoes or boots to avoid being hurt by broken window glass or other sharp objects.
  • Check the structure of the house and quickly leave there if it is damaged; during evacuation, take the stairs.
  • Stay away from beaches and ports in case tsunami should happen.
  • Be aware of aftershocks.