They should realize that the Mercalli scale uses Roman numerals and goes from I to X+ and measures the intensity, or surface effects, of an earthquake. Let them post their charts on a class bulletin board.Copyright © Houghton Mifflin Company. See details at harvnb error: no target: CITEREFDavenportDowrick2002 ( 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 table gives Modified Mercalli scale intensities that are typically observed at locations near the epicenter of the earthquake.The correlation between magnitude and intensity is far from total, depending upon several factors including the depth of the The small table is a rough guide to the degrees of the Modified Mercalli Intensity scale.The Mercalli scale is not defined in terms of more rigorous, objectively quantifiable measurements such as shake amplitude, shake frequency, peak velocity, or peak acceleration. Suggest that students use the Internet or other library resources to gather information. It was developed in 1931 by the American … Wood and Frank Neumann in 1931. Mercalli Scale Interactive. Human-perceived shaking and building damages are best correlated with peak acceleration for lower-intensity events, and with peak velocity for higher-intensity events.The effects of any one earthquake can vary greatly from place to place, so there may be many Mercalli intensity values measured for the same earthquake. Although numerousintensity 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.
Challenge them to include at least ten earthquakes on their charts. These values can be displayed best using a contoured map of equal intensity, known as an Estimating site intensity and its use in seismic hazard assessmentEstimating site intensity and its use in seismic hazard assessmentTheir modifications were mainly to degrees IV and V, with VI contingent on reports of damage to man-made structures, and VII considering only "damage to buildings or other man-made structures". Intensity scales empirically categorize the intensity of shaking based on the effects reported by untrained observers and are adapted for the effects that might be observed in a particular region.In 1904, Adolfo Cancani proposed adding two additional degrees for very strong earthquakes, "catastrophe" and "enormous catastrophe", thus creating a 12-degree scale.When Harry O. The greater numbers of the scale are based on observed structural damage. Powered by Create your own unique website with customizable templates. Through the simulation, students should realize that the Richter scale goes from 0 to 9 and measures the strength, or magnitude, of an earthquake. Each student should make a chart that indicates date, location, magnitude, and maximum intensity. Home Page Need Extra Help (8th) Need Extra Help (7th) Educational Videos Remind What is Mr. Jackson Doing? It was modified again by Harry O. Note: This simulation does not take into account the topography or water masses in the region and is most accurate for events between 3.5 and 6.0 magnitudes. If time permits, present students with the following questions:Encourage interested students to research major earthquakes, especially recent major earthquakes. The Mercalli Intensity Scale was developed by the Italian volcanologist Giuseppe Mercalli in 1884 and expanded to include 12 degrees of intensity in 1902 by Adolfo Cancani. Get Started. Wood and Frank Neumann translated this into English in 1931 (along with modification and condensation of the descriptions, and removal of the acceleration criteria); they named it the "Modified Mercalli Intensity Scale of 1931" (MM31).In their 1993 compendium of historical seismicity in the United States,The categories "catastrophe" and "enormous catastrophe" added by Cancani (XI and XII) are used so infrequently that current USGS practice is merge them into a single category "Extreme" abbreviated as "X+".The lesser degrees of the Modified Mercalli Intensity scale generally describe the manner in which the earthquake is felt by people. While shaking is caused by the seismic energyreleased … It measures the effects of an earthquake at a given location, distinguished from the earthquake's inherent force or strength as measured by seismic magnitude scales (such as the "Mw" magnitude usually reported for an earthquake). The Modified Mercalli intensity scale (MM or MMI), developed from Giuseppe Mercalli's Mercalli intensity scale of 1902, is a seismic intensity scale used for measuring the intensity of shaking produced by an earthquake.
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Mercalli scale Simulator