Seismic Intensity Scale
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.|
- 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.
- 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.
- 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.