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Earthquake Info

Jan 30, 2013
Earthquake Info

SPT MAG SIP successfully exceeded 11 on the mercalli scale with no damage to the panels or joints and this was the maximum the European agreement facility was able to generate. See below for conversion to Richter scale


Death Toll

Moment Magnitude

Mercalli intensity

1920 Haiyuan earthquake 235,502 7.8–8.5 XII
1976 Tangshan earthquake 242,769-650,000 7.8–8.2 XI
2008 Sichuan earthquake 69,195 7.9 XI
1556 Shaanxi earthquake 830,000 7.9–8.0 XI
1960 Valdivia earthquake 2,230–6,000 9.5 XI
1908 Messina earthquake 150,000–200,000 7.2 XI
1964 Good Friday/Anchorage/Alaska earthquake 143. Totals include tsunami. 9.2 XI
1995 Kobe/Great Hanshin earthquake 6,434 6.8–7.3 X–X
1994 Northridge/Los Angeles earthquake 60 6.7 X
1755 Boston/Massachusetts/New England earthquake 0 5.9–6.3 VIII
1977 Vrancea earthquake 1,578 7.2 X–XI
2010 Canterbury earthquake 0 7.1 X
2010 Haiti earthquake 316,000 7.0 X
1980 Irpinia earthquake 2,914 6.5 X
2011 Van earthquake 432 7.2 X
2004 Indian Ocean earthquake and tsunami 230,000–280,000. Totals included tsunami. 9.1–9.3 IX]
2011 Japan earthquake and tsunami 18,500. Totals include tsunami. 9.0 IX
1906 San Francisco earthquake 3,425 7.8 IX
2011 Christchurch earthquake 182 6.3 IX



Magnitude Typical Maximum
Modified Mercalli Intensity
Under 2.0 I
2.0 – 2.9 I – II
3.0 – 3.9 II  IV
4.0 – 4.9 IV  VI
5.0 – 5.9 VI  VIII
6.0 – 6.9 VII  X
7.0 – 9.9 VIII or higher
10.0 or higher X or higher



I. Instrumental Generally not felt by people unless in favorable conditions.
II. Weak Felt only by a few people at rest, especially on the upper floors of buildings. Delicately suspended objects (including chandeliers) may swing slightly.
III. Slight Felt quite noticeably by people indoors, especially on the upper floors of buildings. Many do not recognize it as an earthquake. Standing automobiles may rock slightly. Vibration similar to the passing of a truck. Duration can be estimated. Indoor objects (including chandeliers) may shake.
IV. Moderate Felt indoors by many to all people, and outdoors by few people. Some awakened. Dishes, windows, and doors disturbed, and walls make cracking sounds. Chandeliers and indoor objects shake noticeably. The sensation is more like a heavy truck striking building. Standing automobiles rock noticeably. Dishes and windows rattle alarmingly. Damage none.
V. Rather Strong Felt inside by most or all, and outside. Dishes and windows may break and bells will ring. Vibrations are more like a large train passing close to a house. Possible slight damage to buildings. Liquids may spill out of glasses or open containers. None to a few people are frightened and run outdoors.
VI. Strong Felt by everyone, outside or inside; many frightened and run outdoors, walk unsteadily. Windows, dishes, glassware broken; books fall off shelves; some heavy furniture moved or overturned; a few instances of fallen plaster. Damage slight to moderate to poorly designed buildings, all others receive none to slight damage.
VII. Very Strong Difficult to stand. Furniture broken. Damage light in building of good design and construction; slight to moderate in ordinarily built structures; considerable damage in poorly built or badly designed structures; some chimneys broken or heavily damaged. Noticed by people driving automobiles.
VIII. Destructive Damage slight in structures of good design, considerable in normal buildings with a possible partial collapse. Damage great in poorly built structures. Brick buildings easily receive moderate to extremely heavy damage. Possible fall of chimneys, factory stacks, columns, monuments, walls, etc. Heavy furniture moved.
IX. Violent General panic. Damage slight to moderate (possibly heavy) in well-designed structures. Well-designed structures thrown out of plumb. Damage moderate to great in substantial buildings, with a possible partial collapse. Some buildings may be shifted off foundations. Walls can fall down or collapse.
X. Intense Many well-built structures destroyed, collapsed, or moderately to severely damaged. Most other structures destroyed, possibly shifted off foundation. Large landslides.
XI. Extreme Few, if any structures remain standing. Numerous landslides, cracks and deformation of the ground.
XII. Catastrophic Total destruction – everything is destroyed. Lines of sight and level distorted. Objects thrown into the air. The ground moves in waves or ripples. Large amounts of rock move position. Landscape altered, or leveled by several meters. Even the routes of rivers can be changed.