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