a project of D2L (www.achievementstandards.org). These range from imperceptible shaking to catastrophic difference between earthquake magnitude and WebIntensity Witness Perceptions and Damage; I: Felt by very few people; barely noticeable. (Grade WebWhat is the Modified Mercalli Intensity Scale? The Mercalli scale is particularly useful for comparing modern earthquakes with those that occurred before the era of seismographic recording (i.e., prior to 1900)-and for providing estimates of earthquake location, focal depth, and magnitude for these early events. Many old wooden buildings have collapsed into the street, and virtually all of the brick buildings are destroyed. Doors swing, open, close. ", 22. Thanks for your feedback! Thehighernumbers of the scale are based on observed structural damage. Part three of our introduction to seismology series is an exercise about the Modified Mercalli Intensity scale which is used by seismologists to determine the magnitude and epicenter of earthquakes of the past. Considerable damage 3 - 3 0 obj Accessibility | Privacy Notice XI. U.S. Department of Commerce, National Geophysical Data Center / World Data Service (NGDC/WDS), DOC/NOAA/NESDIS/NCEI > National Centers for Environmental Information, NESDIS, NOAA, Read the newspaper reports for each city and assign Mercalli intensity values to each of the reporting areas based on the classifications in Table 1 above. pages, email and other written documents. Don't stop under bridges, overpasses, trees, or power lines. www.teachengineering.org/activities/view/cub_natdis_lesson03_activity3, Search curriculum by Common Core standards, Natural Disasters: Earthquakes, Volcanoes, Tornadoes & More. The magnitudes required in equation (1) and the earthquake locations for measuring the source-to-site-distances are those cited in previous reports and are detailed in Table 1. Marginal and long-period effects of large earthquakes. Waves on ponds; water turbid with mud. Compared with the previously proposed MMI-PGA relationships for other regions, the standards/provisions of building construction in Myanmar is not high enough to withstand the hazards from earthquakes, particularly at higher levels of ground motion. Earthquake Formation: Crust, Plates, Currents, Drift and Faults, Testing Model Structures: Jell-O Earthquake in the Classroom, Tsunami Attack! WebThe 1931 Modified Mercalli scale used in the United States assigns a Roman numeral in the range I - XII to each earthquake effect. Kramer, S.L. The preliminary relationship between the MMI and PGA is reported to be a function of log10(PGA) = 0.2526MMI 3.1006. Intensity scales date from the late 19th and early 20th centuries, before seismographs capable of accurate measurement of ground motion were developed. The strongest earthquake ever recorded the one in Chile in 1960 was 8.6 on the Richter magnitude scale but had a moment magnitude of ~9.5. The effects of earthquake waves at the surface can be measured using an intensity scale.This is an arbitrary scale based on observations of phenomena such as: The most common intensity scale used in Australia is the 12-point Modified Mercalli scale. to as its intensity. Felt by many indoors, few outdoors. ", 8. Small objects moved. ", 15. Magnitude scales, like the moment magnitude, measure the size of the earthquake at its source. Springfield, MO: "Doors and windows rattled, but no damage reported.". Make sure you understandEarthquake! Jackson, MS: "Broken plaster was noted in the entry to the old City Hall building. Paducah, KY: "A number of old brick buildings collapsed during the quake, though most of the newer buildings survived with little damage. The released energy is 31622776601684 J, and the equivalent of such energy is: 0.0000028 of the most massive earthquake recorded, Chile '60 . Biloxi, MS: "No damage was reported from last night's slight tremor, though chandeliers in a few of the city's old mansions swayed slightly. Modified Mercalli Intensity - SLU Charles Richter developed the logarithmic scale in 1935 to compare local earthquakes the ones in southern California with an epicenter of up to 370 miles (600 km) from the seismograph. 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). Nested under units are lessons (in purple) and hands-on activities (in blue). It occurred in the afternoon, lasted for 10 minutes, and caused tsunamis that affected southern Chile, Hawaii, Japan, the Philippines, New Zealand, Australia, and the Aleutian Islands. ", 2. In this study, all macroseismic intensity data are taken from previous publications of isoseismal maps ranked with respect to the MMI scale. The database is now updated regularly from sources such as U.S. Bridges destroyed. Grey thin lines illustrate the earthquake faults based on Bender et al. Crawl under a sturdy table/desk if nearby. The earthquake magnitude calculator shows not only the energy but also. Slight structural damage. The methodology is simple. How Do Scientists Predict Tsunamis After Earthquakes? Earthquake Intensity Scale Brainstorm with the students how they might illustrate one of the pages. ", 12. May feel like heavy truck passing by. The most familiar of these is the Richter scale - related The Modified Mercalli intensity scale ( MM, MMI, or MCS ), 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. The most important rules to remember are drop, cover, and hold on: Drop to the ground onto your hands and knees. ", 18. WebStep 1 Type the name of the city and the state of the hypothetical earthquake, and then click "Center". 812-855-5809. Explain the different levels of the Mercalli Scale using words or pictures. Background: The Modified Mercalli Intensity Scale Add categories to the /doc subpage. The aforementioned catalog was an expansion A Modified Mercalli Intensity of six is abbreviated as MMI 6. Tremor Troop Earthquakes, Federal Emergency Management This is a public event. W.H. How much bigger was it? ;f:3+f*yZReIxRu3V>5?}k~&K7/E*y Pairs Check/Sharing with the Community: Have students share their booklets with a partner or the person next to them.