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(Table below) Comparison between earthquake magnitude (Richter Scale) and intensity (Modified Mercalli Scale).
Magnitude 1.0–3.0
Intensity I
Description
I. Not felt except by a very few people under especially
favourable conditions.
3.0–3.9
II–III
II. Felt only by a few persons at rest, especially on upper floors of buildings.
III. Felt quite noticeably by people indoors, especially on upper floors of buildings. Many people do not recognise it as an earthquake. Standing cars may rock slightly. Vibrations similar to the passing of
a truck. Duration estimated.
4.0–4.9
IV–V
IV. Felt indoors by many people, outdoors by a few during the day. At night some people awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing cars rocked noticeably.
V. Felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop.
5.0–5.9
VI–VII
VI. Felt by all; many people will be frightened. Some heavy furniture moved; instances of fallen plaster may occur. Damage slight.
VII. Damage negligible in buildings of good design and construction; slight to moderate in well-built ordinary structures; considerable damage in poorly built or badly designed structures; some chimneys broken.
6.0–6.9
VIII–IX
VIII. Damage slight in specially designed
structures; considerable damage in ordinary substantial buildings with partial collapse. Damage great in poorly built structures. Fall of chimneys, factory stacks, columns, monuments, walls. Heavy furniture overturned.
IX. Damage considerable in specially designed structures; well-designed frame structures thrown
out of plumb. Damage great in substantial buildings, with partial collapse. Buildings shifted off foundations.
7.0 and higher
X or higher
X. Some well-built wooden structures destroyed; most masonry and frame structures destroyed with foundations. Rails bent.
XI. Few, if any (masonry), structures remain standing. Bridges destroyed. Rails bent greatly.
XII. Damage total. Lines of sight and level are distorted. Objects thrown into the air.
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