Earthquake 101

More relevant content and reference about earthquakes will be added soon. I'm still doing research. :D

Richter Scale [1]

Color Legend:
0 ~ 1 Not Felt
2 ~ 4 Minor
4 ~ 5 Small
5 ~ 6 Moderate
6 ~ 7 Strong
7 ~ 8 Major
8 ~ Great

Earthquake Magnitude Squale (Richter Scale)[2]

Magnitude Description What it feels like Estimated Count Each Year
0 ~ 1.9 Micro Normally only recorded by seismographs. Most people cannot feel them. Millions per year.
2.0 ~ 2.9 Minor A few people feel them. No building damage. Over 1 million per year.
3.0 ~ 3.9 Minor Some people feel them. Objects inside can be seen shaking. Over 100,000 per year.
4.0 ~ 4.9 Small Most people feel it. Indoor objects shake or fall to floor. 10,000 to 15,000 per year.
5.0 ~ 5.9 Moderate Can damage or destroy buildings not designed to withstand earthquakes. Everyone feels it. 1,000 to 1,500 per year.
6.0 ~ 6.9 Strong Wide spread shaking far from epicenter. Damages building. 100 to 150 per year.
7.0 ~ 7.9 Major Wide spread damage in most areas. 10 to 20 per year.
8.0 ~ 8.9 Great Wide spread damage in large areas. About 1 per year.
9.0 ~ 9.9 Great Severe damage to most buildings. About 1 per 5~50 years.
10.0 ~ 99.00 Great Never recorded. Never recorded.

Earthquake Magnitude Squale (Modified Mercalli Intensity Scale)[3]

Intensity Description What it feels like
I Micro Not felt except by very few under especially favorable conditions.
II Micro Felt only by a few people at rest, especially on upper floors of buildings.
III Minor Felt quite noticeably by people indoors, especially on upper floors of buildings. Many people do not recognize it as an earthquake. Standing motor cars may rock slightly. Vibrations similar to the passing of a truck. Duration estimated.
IV Minor Felt indoors by many, outdoors by few during the day. At night, some awakened. Dishes, windows, doors disturbed; walls make cracking sound. Sensation like heavy truck striking building. Standing motor cars rocked noticeably.
V Small Felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop.
VI Moderate Felt by nearly everyone; many awakened. Some dishes, windows broken. Unstable objects overturned. Pendulum clocks may stop.
VII Strong 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.
VIII Major 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 Great 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. Liquefaction.
X Great Some well-built wooden structures destroyed; most masonry and frame structures destroyed with foundations. Rails bent.
XI Great Few, if any, (masonry) structures remain standing. Bridges destroyed. Broad fissures in ground. Underground pipe lines completely out of service. Earth slumps and land slips in soft ground. Rails bent greatly.
XII Great Damage total. Waves seen on ground surfaces. Lines of sight and level distorted. Objects thrown upward into the air.