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Topic: Mercalli scale


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  Scale - Wikipedia, the free encyclopedia
The Richter scale, the Mercalli scale, the Rossi-Forel scale and the Omori are all used to measure the intensity of earthquakes.
The Fujita scale measures the intensity of tornadoes.
The Torino scale and the Palermo scale measure the impact hazard level of near-Earth objects such as asteroids.
en.wikipedia.org /wiki/Scale   (230 words)

  
 Mercalli Intensity Scale - Wikipedia, the free encyclopedia
The Mercalli Intensity Scale is a scale used to classify the intensity of an earthquake by examining its effects on people and structures at the Earth's surface.
It was devised by Italian volcanologist Giuseppe Mercalli in 1902, and was in general use before the Richter scale.
The lower numbers of the intensity scale generally deal with the manner in which the earthquake is felt by people.
en.wikipedia.org /wiki/Mercalli_Intensity_Scale   (335 words)

  
 International Space School Educational Trust ISSET
The extension of the scale to twelve degrees was therefore proposed by Cancani.
The scale was published in draft form by the Council of Europe in 1993, and was ratified at the ESC meeting in Reykjavik in September 1996, following a three-year testing period.
Previous scales assumed that the reader would always correctly understand the author's intentions, which experience has shown is not always the case.
www.isset.org /doc.php?pagelocation=51&doc=740   (892 words)

  
 module 6B   (Site not responding. Last check: 2007-09-17)
The main advantage of using the Mercalli scale is that it concentrates on the primary concern of people: surface damage.
Another disadvantage is that the scale is somewhat subjective; two people might come up with different estimates of Mercalli intensity for the same earthquake in the same town.
When the Richter scale was used for worldwide earthquakes, several complications were recognized; the main problem is that it uses whatever wave is largest on the seismograph, without specifying wave type.
www.mines.utah.edu /geology/courses/UOnline/modules/M6b.html   (1440 words)

  
 earthquake intensity
All of these are “Modified Mercalli scales.” The improvements made the descriptions less regional and more precise (instead of “buildings fall,” the newer scales say what kinds of buildings fall), and have refined the groupings to be sure they include events that actually occur together.
Intensities on the Mercalli scale are usually shown in Roman numerals, a convention worth preserving because it helps to distinguish intensity ratings from magnitude ratings.
The Modified Mercalli Scale is a good way of saying how bad it was at some particular location, but it isn't a good way of saying how strong the earthquake was in general.
www.sizes.com /natural/quakintens.htm   (776 words)

  
 Information about the Puerto Rico Seismic Network (PRSN)
It was felt in the Dominican Republic and throughout Puerto Rico, with a maximum intensity of IV in the Modified Mercalli Scale (MM) for the western area of the island.
The earthquake of greater magnitude (4.7 in the Richter Scale) happened the 13 of November at 16:27:49, this was felt in the Virgin Islands and all Puerto Rico.
The earthquake of greater intensity (V in Modified the Mercalli Scale, the central area and east of the island) happened the 20 of June at 11:24:24, this was felt in almost all the island of Puerto Rico.
rmsismo.uprm.edu /English/Seismicity/PRSN-Seismicity.html   (1699 words)

  
 The Mercalli Scale   (Site not responding. Last check: 2007-09-17)
The Mercalli Intensity Scale assigns an intensity or rating to measure the effects of an earthquake at a particular location.
This is because the amount of damage caused by an earthquake at a particular location depends on the geology of the location The population density and the methods used to construct buildings near the location are also important in the Mercalli scale.
This Mercalli scale is from the Loma Prieta earthquake in the Santa Cruz mountains in California.
www.thetech.org /exhibits_events/online/quakes/grams/mercalli.html   (141 words)

  
 earthquake scale   (Site not responding. Last check: 2007-09-17)
Mercalli Intensity Scale to express the variable effects of an earthquake.
The Modified Mercalli Intensity Scale is used to describe earthquake effects.
In seismology a scale of seismic intensity is a way of measuring or rating the effects of an earthquake...
www.thebestearthquakesinfo.com /6/earthquake-scale.html   (326 words)

  
 ASC - The Modified Mercalli Scale   (Site not responding. Last check: 2007-09-17)
Although numerous intensity scales have been developed over the last several hundred years to evaluate the effects of earthquakes, the one currently used in the United States is the Modified Mercalli (MM) Intensity Scale.
This scale, composed of 12 increasing levels of intensity that range from imperceptible shaking to catastrophic destruction, is designated by Roman numerals.
The Modified Mercalli Intensity value assigned to a specific site after an earthquake has a more meaningful measure of severity to the nonscientist than the magnitude because intensity refers to the effects actually experienced at that place.
www.asc-india.org /info/mercalli.htm   (346 words)

  
 Earthquakes : The Richter Scale   (Site not responding. Last check: 2007-09-17)
The Mercalli Scale is a rather arbitrary set of definitions based upon what people in the area feel, and their observations of damage to buildings around them.
He took the existing Mercalli scale and tried to add a 'scientific' scale based on accurate measurements that could be recorded by seismographs (instruments used to measure vibration) regardless of their global location.
The Richter scale for earthquake measurements is logarithmic.
www.zephryus.demon.co.uk /geography/resources/earth/richt.html   (710 words)

  
 [No title]   (Site not responding. Last check: 2007-09-17)
Events of Mercalli intensity II to III were reported as far north as upper New York state and western New England and as far south as the tip of Florida.
The Magnitude Scale: A Measure of Size A method of rating the size of earthquakes is by using scientific instruments to measure the amplitude of body waves and surface waves recorded on seismograms.
Introduce the Mercalli scale by explaining its purpose: to measure the intensity of the damage an earthquake causes.
www.fema.gov /txt/hazards/earthquakes/nehrp/fema-159-08-unit4.txt   (5273 words)

  
 SCALES.HTM   (Site not responding. Last check: 2007-09-17)
The Mercalli scale - named after Italian seismologist Giuseppe Mercalli (1850-1914) is a measurement of the intensity from the observed effects of an earthquake.
This is a subjective scale in that the Mercalli Number will vary from place to place depending on the distance from the epicenter.
The Richter Scale is most useful to geologists in that it measures the amount of energy released by movements in the Earth's crust whilst the Mercalli Scale is more a measure of the effect on people and property.
myweb.tiscali.co.uk /stonemuseum/scales.htm   (228 words)

  
 Earthquake Intensity
In seismology a scale of seismic intensity is a way of measuring or rating the effects of an earthquake at different sites.
The Modified Mercalli Intensity Scale is commonly used in the United States by seismologists seeking information on the severity of earthquake effects.
The Intensity Scale differs from the Richter Magnitude Scale in that the effects of any one earthquake vary greatly from place to place, so there may be many Intensity values (e.g.: IV, VII) measured from one earthquake.
www.seismo.unr.edu /ftp/pub/louie/class/100/mercalli.html   (468 words)

  
 Earthquakes II   (Site not responding. Last check: 2007-09-17)
Modified Mercalli scale is used to measure damage and human perception of an earthquake.
The Mercalli scale is useful in ranking historical earthquakes that occurred before the widespread use of seismographs (after World War II).
The scale is logarithmic, each division represents a ten-fold increase in the ground motion associated with the earthquake, and ~30-times increase in energy released.
enterprise.cc.uakron.edu /geology/natscigeo/Lectures/equake2/eq2.htm   (1347 words)

  
 Measuring Earthquakes
In considering the numbers outputted by the Richter Magnitude Scale, one must remember that because the scale is based on logarithmic computations, the difference between a 5.3 earthquake and a 6.3 earthquake is tenfold in amplitude.
Originally created in 1902 by Italian seismologist and volcanologist Guiseppe Mercalli and modified in 1931 by seismologists Harry Wood and Frank Neumann, the Modified Mercalli Intensity Scale is based on the effect the intensity of an earthquake has on the surface of the planet.
Mercalli intensities are assigned to an earthquake after non-scientific information has been compiled, such as how scared people were or how much destruction the earthquake caused.
www.geocities.com /seiswash/measuring_earthquakes.htm   (809 words)

  
 Modified mercalli intensity scale: earthquakes: office of emergency management: departments: City of Fort Collins
The earlier method is known as the Modified Mercalli Intensity Scale.
This scale was invented by Giuseppe Mercalli in 1902.
It has a graduated scale from 1 to 12 and is based on peoples' visual and physical observations at the time of the event.
www.ci.fort-collins.co.us /oem/modified-mercalli.php   (478 words)

  
 How Are Earthquake Magnitudes Measured?   (Site not responding. Last check: 2007-09-17)
Using this scale, a magnitude 5 earthquake would result in ten times the level of ground shaking as a magnitude 4 earthquake (and 32 times as much energy would be released).
Invented by Giuseppe Mercalli in 1902, this scale uses the observations of the people who experienced the earthquake to estimate its intensity.
The Mercalli scale isn't considered as scientific as the Richter scale, though.
www.geo.mtu.edu /UPSeis/intensity.html   (471 words)

  
 Mercalli scale and the Richter magnitude
The intensity of the earthquakes is valued according to the Richter scale (Charles Francis Richter 26/4/1900 - 30/9/1985) or the modified Mercalli scale (Giuseppe Mercalli 21/5/1850 - 19/3/1914).
The first scale furnishes an evaluation (magnitude) of the quantity of freed energy, while the seconds scale assigns a degree to the effects on the environment.
The appraisal of the energy freed from a seism is associated to an index, by definition magnitudo, it has drawn to divide the decimal logarithm of the maximum ampleness of a shake and the logarithm of a shake champion.
www.themeter.net /sism_e.htm   (415 words)

  
 Modified Mercalli scale - Simple English Wikipedia
The Modified Mercalli scale is a scale which helps measure things.
It is used to tell the amount of damage caused by an earthquake.
The scale ranges from 1(not felt at all) to 12 (lots and lots of things are broken)
simple.wikipedia.org /wiki/Modified_Mercalli_scale   (130 words)

  
 Richter scale
Quantitative scale of earthquake magnitude based on the measurement of seismic waves, used to indicate the magnitude of an earthquake at its epicentre.
The Richter scale is logarithmic, so an earthquake of 6.0 is ten times greater than one of 5.0.
The magnitude of an earthquake differs from its intensity, measured by the Mercalli scale, which is qualitative and varies from place to place for the same earthquake.
www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0007810.html   (201 words)

  
 Insure.com - home insurance - The Modified Mercalli Intensity Scale   (Site not responding. Last check: 2007-09-17)
The Modified Mercalli Intensity Scale was developed in 1931 by American seismologists Harry Wood and Frank Neumann.
The scale, composed of 12 levels of intensity that range from imperceptible shaking to catastrophic destruction, is designated by Roman numerals.
The scale is not mathematically based, but rather a ranking based on observed effects.
info.insure.com /home/disaster/mercalli.html   (325 words)

  
 THE MERCALLI SCALE   (Site not responding. Last check: 2007-09-17)
The Modified Mercalli Intensity Scale was introduced in 1931 by two American seismologists Frank Neumann and Harry Wood.
The scale ranges from 1 to 12 using Roman Numerals, and is based on intensity.
This is not to be confused with the Richter Scale which shows the magnitude of an earthquake.
www.pivot.net /~cotterly/mercalli.htm   (352 words)

  
 USGS Earthquake Hazards Program-FAQ - Frequently Asked Questions
The idea of a logarithmic earthquake magnitude scale was first developed by Charles Richter in the 1930's for measuring the size of earthquakes occurring in southern California using relatively high-frequency data from nearby seismograph stations.
This magnitude scale was referred to as ML, with the L standing for local.
From a scientific standpoint, the Richter scale is based on seismic records while the Mercalli is based on observable data which can be subjective.
earthquake.usgs.gov /faq/meas.html   (2978 words)

  
 Seismology Education
On this scale, intensities up to 5 are felt but cause no damage, while intensities from 6 to 12 cause increasing amounts of damage.
The JMA (Japan Meteorological Agency) scale from 1 to 7 is used in Japan and Taiwan.
The MSK scale is the most recent, has 12 values that approximate but are not the same the Modified Mercalli values, and is used extensively in Europe.
www.seis.com.au /Basics/Effects.html   (276 words)

  
 Pennsylvania - A Keystone Geology: Internal Processes - Mercalli Scale
The Richter scale is a measurement of the magnitude of the quake at its epicenter.
Due to many variables, such as the material the shock waves pass through, the number and construction of buildings, etc., the actual effect of two earthquakes of the same magnitude may vary significantly.
The Mercalli Scale, on the other hand, is a measurement of the quake's "felt intensity" and an earthquake will be represented by a map of many numbers with the largest numbers representing the most severely affected areas which may or may not be the epicenter of the quake.
www.pageology.info /internal/earthquakes/mercalli.html   (954 words)

  
 Mercalli scale
Qualitative scale describing the intensity of an earthquake.
It differs from the Richter scale, which indicates earthquake magnitude and is quantitative.
Intensity is a subjective value, based on observed phenomena, and varies from place to place even when describing the same earthquake.
www.tiscali.co.uk /reference/encyclopaedia/hutchinson/m0006344.html   (106 words)

  
 SEISMIC INTENSITY SCALES   (Site not responding. Last check: 2007-09-17)
A scale of seismic intensity is a way of measuring or rating the effects of an earthquake at different sites.
The Modified Mercalli Intensity Scale is commonly used in the United States to seek information on the severity of effects of an earthquake.
The Mercalli scale is a semi-quantitative linear scale.
www.il-st-acad-sci.org /kingdom/geo1001.html   (403 words)

  
 The Severity of an Earthquake
The Richter magnitude scale was developed in 1935 by Charles F.
Adjustments are included in the magnitude formula to compensate for the variation in the distance between the various seismographs and the epicenter of the earthquakes.
The intensity scale consists of a series of certain key responses such as people awakening, movement of furniture, damage to chimneys, and finally--total destruction.
pubs.usgs.gov /gip/earthq4/severitygip.html   (1578 words)

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