Thang độ lớn động đất
Thang đo độ lớn kiểu Richter đo lượng năng lượng giải phóng của động đất. Mỗi tăng một số nguyên đại diện cho khoảng 31,6 lần nhiều năng lượng hơn.
M1
Micro
Micro earthquakes, not felt by humans.
Cảm nhận: Not felt. Detected only by seismographs.
M2
Minor
Minor earthquakes. Felt by few people.
Cảm nhận: Felt by people at rest, on upper floors of tall buildings.
M3
Minor
Often felt, but rarely causes damage.
Cảm nhận: Felt by many indoors; hanging objects swing.
M4
Light
Noticeable shaking of indoor objects. Rarely causes significant damage.
Cảm nhận: Felt by most people; dishes rattle.
Thiệt hại: Light
M5
Moderate
Can cause major damage to poorly constructed buildings.
Cảm nhận: Causes damage to poorly built structures. Felt by everyone.
Thiệt hại: Moderate to significant
M6
Strong
Destructive in areas up to 160km from epicenter.
Cảm nhận: Destructive to a moderate radius.
Thiệt hại: Moderate to severe
M7
Major
Causes serious damage over large areas.
Cảm nhận: Can cause serious damage over wider areas.
Thiệt hại: Severe
M8
Great
Can cause severe damage in areas several hundred km wide.
Cảm nhận: Major damage to structures; felt at extreme distances.
Thiệt hại: Severe over large areas
M9
Extreme
Devastating over massive areas. Rare once-per-decade events.
Cảm nhận: Total destruction near epicenter; tsunamis generated.
Thiệt hại: Catastrophic