The Central Weather Administration seismic intensity scale (, CWASIS) is a seismic intensity scale used in Taiwan. It was established by the Central Weather Administration.
Scale overview
+Seismic Intensity Scale交通部中央氣象局新聞稿Precautions for Earthquake - Central Weather AdministrationIntensity Level(震度分級)Strong Ground Acceleration(cm/s2,gal)Ground Speed(cm/s)What People FeelEffects IndoorsEffects Outdoors0Undetectable(無感)below 0.8 galImperceptible to humans1Slight(微震)0.8-2.5 galPeople may feel slight shaking when motionless2Weak(輕震)2.5-8.0 galMost people will feel shaking, and some sleepers may wake upLight shaking of dangling objects such as lampsStationary vehicles shake slightly, similar to when a truck passes by, but only for a short time3Light(弱震)8.0-25 galAlmost everyone will feel shaking, and some may experience fearHouses shake; bowls, plates, doors, windows etc. make noise; dangling objects swingStationary vehicles shake visibly; power lines sway slightly4Moderate(中震)25-80 galless than 15 cm/sWill cause a considerable degree of fear; some people will look for shelter, and almost all sleepers will wake upHouses shake violently; objects tumble; heavy furniture moves; slight damage may occurVehicle drivers feel slight shaking; power lines sway visibly; pedestrians also feel shaking55 LowerStrong(強震)80 gal and above 15–30 cm/sMost people are frightened and panicSome walls crack; heavy furniture may be overturnedVehicle drivers feel obvious shaking; some signboards and chimneys fall or collapse5 Upper 30–50 cm/sAlmost everyone is frightened and panics, and has difficulty walkingLarge quantities of unsecured items tumble and fall; furniture moves or is overturned; some doors and windows become twisted; some walls crack; a small number of houses with poor seismic resistance may be damaged or collapseWall tiles fall from some buildings; rockfalls occur in mountainous areas; liquefaction may occur in soft soil; utilities and/or communications may be interrupted in some areas; a small number of brick walls with poor seismic resistance may be damaged or collapse66 LowerViolent(烈震) 50–80 cm/sViolent shaking makes it difficult to remain standingSome buildings are damaged; heavy furniture is overturned; doors and windows twistDrivers have difficulty driving; soil liquefaction is seen6 Upper 80–140 cm/sViolent shaking makes it almost impossible to standLots of furniture moves violently or is overturned; doors and windows become twisted; some houses with poor seismic resistance may be damaged or collapse, and even houses with better seismic resistance may also be damagedSome ground surfaces crack; landslides may occur in mountainous areas; liquefaction occurs in soft soil; utilities and/or communications may be interrupted on a large scale7Extreme(劇震)140 cm/s and aboveViolent shaking make voluntary action impossibleSome buildings are seriously damaged or collapse; almost all furniture moves a long distance or tumblesLandslides occur and fissures appear; railroad tracks are twisted; underground pipelines are damaged
References