The modified mercalli mmi scale expresses intensity of an earthquake and indicates strength of felt shock at a particular location. Modified mercalli scale rates the amount of shaking from an earthquake done by observation no instruments richter scale measures earthquake magnitude size measure small earthquakes using seismographs take distance into account moment magnitude scale measure total energy of an earthquake using seismographs. Modified mercalli scale intensity effects pgagals i not felt. Helps students understnad difference between magnitude and intensity. Measuring earthquakes the richter and mercalli scales lesson plan.
Find mercalli scale lesson plans and teaching resources. The richter scale is a measure of the energy released during the earthquake. It is actually a measurement of the size of the waves produced by the earthquake. Modified mercalli scale intensity effects pga gals i not felt. The modified mercalli scale measures how people feel and react to the shaking. The mercalli intensity scale is a seismic scale used for measuring the intensity of an earthquake. Modified mercalli intensity mmi scale is a subjective measurement of earthquake effects and damage.
Wood, and frank neumann, modified mercalli s 12value scale into what we use today. This table gives modified mercalli scale intensities that are typically observed at locations near the epicenter of the earthquake. Pdf relationship between modified mercalli intensity and. The modified mercalli intensity scale is a semiquantitative linear scale developed in 1931 by the american seismologists harry wood and frank neumann. Then, students can find the hospital on the mercalli scale map, and use the mercalli scale to determine the relative damage that occurred at the hospital based on context clues feel free to use the provided earthquake scenario key to help out with this, or to use while youre circulating with students to check their work in real time. Modified mercalli intensity scale, the a description of the modified. Aug 29, 2017 the measuring tool used in a richter scale is a seismograph while observation is used on the mercalli scale. It is known today as the modified mercalli intensity scale. The severity of an earthquake can be expressed in terms of both intensity and magnitude.
St31wss plans and conducts scientific investigations. The modified mercalli mm intensity scale the mm intensity scale is the commonly used scale to describe the intensity of the earthquake. Revisions in this version of the scale are shown in italics. Pdf the modified mercalli intensity scale revisions. Mercalli scale vs richter scale difference and comparison. Instead of using vague and subjective descriptions like major, minor or heavy, a mikemike value is reported. On the modified mercalli intensity scale the maximum value is. In this faults worksheet, students use an earthquake reference sheet to find the numbers for a modified mercalli and richter scale.
Learn vocabulary, terms, and more with flashcards, games, and other study tools. Use this worksheet to help students synthesize the. The mercalli scale is relative at it relies on peoples feelings and reactions to an earthquake. Unlike with the richter scale, the mercalli scale does not take into account energy of an earthquake directly.
Risk management plans emergency restoration plans erp facility response plans onsite emergency response teams ert earthquake simulations 2011 with sema. The modified mercalli intensity scale, us government. 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. The mercalli scale uses twelve steps to describe damage to structures. What is the difference between the richter and mercali scale. Thus, the magnitude scale is considered scientifically more objective. Modified mercalli intensity scale mmi the modified mercalli intensity mmi estimates the intensity of shaking from an earthquake at a specific location or over a specific area by considering its effects on people, objects, and buildings. Using the modified mercalli scale to locate an epicenter earthquakes are classified using different scales. Mercalli scale noun the noun mercalli scale has 1 sense 1. Modified mercalli intensity scale damage potential x very light. Modified mercalli scale level ix partialcomplete collapse modified mercalli intensity scale 5 6. This scale, composed of increasing levels of intensity that range from imperceptible shaking to.
Print out one copy of the kwat television script and cut them into cards. 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. The mercalli intensity scale was developed by italian volcanologist giuseppe mercalli in 1884 and expanded to include 12 degrees of intensity in 1902 by adolfo cancani. While shaking is driven by the seismic energy released by an earthquake, earthquakes differ in how much of their energy is rad. The richter scale and modified mercalli intensity scale. The richter scale reading for the major aftershock that occurred on the 12th of may, 2015 was 7.
Intensity and intensity scales gfzpublic gfzpotsdam. In the united states, we use the modified mercalli mmi scale. Sep 22, 2014 using the modified mercalli scale to locate an epicenter earthquakes are classified using different scales. Modified mercalli scale uwi seismic research centre. Be sure you have an application to open this file type before downloading. Modified mercalli intensity scale mmi abag resilience.
Volcanoes and earthquakes miamidade county public schools. The modified mercalli scale measures how people feel and react to. The mmi scale estimates the shaking strength of an earthquake at a specific location, such as the epicenter, or over a specific area by considering its effects on people, objects, and buildings. As you can see here, as the numbers get higher, the more you feel the shaking. The higher numbers of the scale are based on observed structural damage. Modified mercalli earthquake scale the intensity of an earthquake is listed along with effects on the modified mercalli scale in this printable guide. Its based around measuring the destructive capability of an earthquake.
Jun 09, 2016 the mercalli scale is a twelve point scale, 1 being almost undetectable and 12 being complete destruction. The mercalli scale is based on observable earthquake damage. The modified mercalli intensity scale, descended from giuseppe mercallis mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the intensity of shaking produced by an earthquake. The lower degrees of the modified mercalli intensity scale generally deal with the manner in which the earthquake is felt by people. The modified mercalli intensity scale simplified, from reference. Marginal and longperiod effects of large earthquakes. Homework sheet or maybe extension task where pupils draw their own mercalli scale. While the mercalli scale measures the perceived damage, the richter scale magnitude is a quantitative measure of an earthquakes power, as the richter scale measures displacement via seismic waves. Magnitude versus intensity lesson pdf classroom lesson to teach the difference between earthquake magnitude and earthquake intensities 8. Display the modified mercalli scale on the overhead projector.
Today, we are going to look at the mercalli scale s damage rating and create a booklet to help inform citizens of potential danger. When there is little damage, the scale describes how. An earthquake has a single magnitude that indicates the overall size and energy released by the earthquake. The modified mercalli scale is a measure of the amount of damage done by the earthquake. The modified mercalli intensity scale has been used to categorise noninstrumental observations of earthquakes in new zealand since the mid1940s when it replaced the rossiforel scale then in use. However, the amount of shaking experienced at different locations varies based on not only that overall magnitude, how far you are from the fault that ruptured in the. Pdf prediction of modified mercalli intensity from pga, pgv. Using the modified mercalli scale to locate an epicenter. This scale is composed of 12 increasing levels of intensity, designated by roman numerals, ranging from imperceptible shaking to catastrophic destruction. Scientists record responses from many people who experience the. Handout primarily discussing the modified mercalli scale. In this workshop, participants use simple materials to build small scale shake platforms and. Review the roman numerals and read their descriptions.
Homework sheet or maybe an extension task where students are asked to draw their own mercalli scale. The modified mercalli intensity scale mm or mmi, descended from giuseppe mercallis mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the intensity of shaking produced by an earthquake. What is the difference between magnitude and intensity. The strength of an earthquake is usually measured on one of two scales, the modified mercalli scale and the richter scale. Mercalli intensity scale simple english wikipedia, the free. It is advisable to plan such investigations as much as possible before an. The modified mercalli intensity scale sandiegocounty. A revision of the modified mercalli intensity scale eqc. The intensity of the earthquakes is valued according to the richter scale charles francis richter 2641900 3091985 or the modified mercalli scale giuseppe mercalli 2151850 1931914. Mar 20, 20 how to create a spectacular christmas garland for your mantel full length duration.
It was developed in 1931 by the american seismologists harry wood and frank neumann. Today, we are going to look at the mercalli scales damage rating and create a booklet to help inform citizens of potential danger. Map of earthquake and tsunami damage potential for a open. Use this worksheet to help students synthesize the levels of the mercalli scale. Rather, they classify earthquakes by the effects they have and the destruction they cause.
Tes global ltd is registered in england company no 02017289 with its registered office. Richters version became instead the modified mercalli scale of 1956 mm56. Scientists record responses from many people who experience the earthquake and assign a value from ito xii. In new zealand, where earthquakes occur from near the surface right down to a depth of over 600 km, the modified mercalli intensity scale is a better indicator of an earthquakes effects on people and their environment. Charleston sc, according to the modified mercalli intensity scale. Risk management plans emergency restoration plans erp. Terms in this set 43 are earthquake waves that cause the most property damage. Maps drawn from reports of what people felt are useful in determining areas of damage concentration. Roman numerals are used to rate the intensity and damage.
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. In santa clara county aresraces, we use the modified mercalli intensity scale for efficient and standardized reporting of earthquake damage. It measures the effects of an earthquake, and is distinct from the moment magnitude usually reported for an earthquake sometimes misreported as the. The richter scale is a mathematical measurement of the intensity of the ground shaking, as measured on a seismograph. Mercalli scale homework sheet lesson plan template and teaching resources. Generate, develop, test and communicate design ideas, plans and processes for. The modified mercalli scale measures the earthquakes effect on people, property and ground damage. In other words, the greater the ricther scale magnitude, there will also be a greater mercalli scale intensity the vast majority of the time. The lower levels of the intensity scale indicate the effect of earthquake. It measures the effects of an earthquake at a given location, distinguished from the earthquakes inherent force or strength as measured by seismic magnitude scales.
The modified mercalli intensity mmi scale depicts shaking severity. The intensity of an earthquake is listed along with effects on the modified mercalli scale in this printable guide. The richter scale is absolute which means that wherever an earthquake is registered, it will have the same measurement on the richter scale. How to create a spectacular christmas garland for your mantel full length duration. Earthquake intensitywhat controls the shaking you feel. The mercalli scale uses human observation to assess damage from an earthquake, while a richter scale uses instruments to measure how much force an earthquake produces, or the size of its waves. It is composed of 12 increasing levels of intensity which range from ground shaking to catastrophic destruction. It measures the effects of an earthquake at a given location, distinguished from the earthquakes inherent force or strength as measured by seismic magnitude scales such as the.
May 25, 2017 mercalli intensity scale explained duration. Magnitude is related to the amount of seismic energy released at the hypocenter of the earthquake. From a scientific standpoint, the magnitude scale is based on seismic records while the mercalli is based on observable data which can be subjective. Modified mercalli intensity scale mmi abag resilience program.
Moment magnitude is a different measure from the richter scale, which was designed in 1935 for small to medium earthquakes in california, within 600 km of the recording seismograph. However, the two terms are quite different, and they are often confused. Mercalli intensity scale simple english wikipedia, the. Earth science earthquakes, volcanoes and plate tectonics. It measures the shaking you feel during an earthquake. The modified mercalli intensity scale the intensity of the earthquake according to the modified mercalli intensity scale is ix violent. Some intensity scales in the past, such as the modified mercalli scale in its. This scale is composed of 12 increasing levels of intensity, designated by roman numerals, ranging from imperceptible shaking to.
It is based on the amplitude of the earthquake waves. When it comes to rating an earthquake, what are the. The lower numbers of the intensity scale generally deal with the manner in which the earthquake is felt. Felt indoors by many, outdoors by few, some awakened at night, dishes, windows, doors, rattle and move, stationary cars rock. Measuring earthquakes lesson plan and worksheet teaching. Modified mercalli scale how is modified mercalli scale. Mercalli scale illustrated activity teachengineering. A 10value scale which had been in use in europe since 1883 was refined in 1902 by an italian seismologist, giuseppe mercalli. Make transparencies of the modified mercalli scale and the wattsville map key to place.
A version modified to improve its usefulness for new zealand conditions was published by eiby in 1966. The mercalli intensity scale or more precisely the modified mercalli intensity scale is a scale to measure the intensity of earthquakes. Because of these shortcomings, moment magnitude is the most common scale used by the united states geological survey usgs. An earthquake may have a different intensity rating at different locations.
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