Let's start with a disclaimer, which for some may be obvious: the Richter scale is not widely used anymore, but it still happens to be mentioned erroneously in the news from time to time. 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. Few, if any, structures standing. In the article below, you'll learn about the different measures of an earthquake: from the famous Richter scale to the currently used moment magnitude scale and Mercalli scale, which is an intensity scale describing the effects of the phenomenon. %PDF-1.5 During 1929-1930 AD, there were five earthquakes within the magnitude of range 7.0 - 7.3 Richter that occurred in the Myanmar region. Some heavy furniture moved, some plaster falls. Trees and poles May feel like heavy truck passing by. Some damage to reinforced masonry; none to reinforced masonry designed to resist lateral forces. political geography, and additional comments are also provided for each earthquake. Kawasumi, H. (1951) Measures of earthquake danger and expectancy of maximum intensity throughout Japan as inferred from the seismic activity in historical times. z/76 E1(S=C50R6*C?dzy}5n`u%]|QJ. Homepege, http://neic.usgs.gov/neis/general/handouts/mercalli.html. EARTHQUAKE SIMULATOR - APOLO11.COM Practically for each MMI level, there is more than one value or the source-to-site-distances (i.e., the MMI boundary is not a perfect circle), and consequently the average distance was used. From a scientific standpoint, the magnitude scale is based on seismic records while the Mercalli is based on observable data which can be subjective. Earthquake, 17, 711-723. 4 0 obj simulated, basing on either actually recorded or synthesized 3-D digital strong-motion data. Lexington, KY: "Mama Leone's Restaurant reported that several plates and dishes fell off of their shelves and broke. The magnitude does not depend on where the measurement is made. difference between earthquake magnitude and Description of Source: The Significant Earthquake database originated from the Significant Earthquake Catalog Relationship between Peak Ground Acceleration Grey thin lines illustrate the earthquake faults based on Bender et al. The Modified Mercalli Intensity Scale | U.S. Geological Survey Brainstorm with the students how they might illustrate one of the pages. PS: We do not share personal information or emails with anyone. Union of Burma Journal of Science and Technology, 1, 241-251. Also, our tool is a safe bet if you want to compare different earthquakes and want to know how much stronger one earthquake is compared to another. Add categories to the /doc subpage. Based on data from the northeastern United States, seismologists have estimated the following relation between earthquake magnitude (M) and epicentral intensity (Ie): M = 0.62 Ie + 0. This study, therefore, used the PGA to calibrate with the obtained macroseismic intensity data. Simulator Thehighernumbers of the scale are based on observed structural damage. Single copies of this publication may be obtained It is influenced by the amount of kinetic energy released, the Therefore, the seismic building code of Myanmar should be modified in order to reduce future hazards arising from earthquakes. The first of these, the Mandalay earthquake, was generated at the central part of the Sagiang Fault Zone and the second, the Tounggyi earthquake, occurred in the Moei-Tounggyi Fault Zone [4,5] eastwards of Myanmar. Sleepers awaken. Frame houses moved on foundations if not bolted down; loose panel walls thrown out. Moment Magnitude Explained: What Happened to the Richter Scale? WebA 12-point abridged form of the modified Mercalli scale is provided below. of Commerce, ICSU-WDS > International Council for Science - World Data System. These are briefly detailed as follows. A Modified Mercalli Intensity of six is abbreviated as MMI 6. ""Many residents ran into the street in panic during the severe shaking, though building damage was mostly restricted to a few cracked chimneys. Earth, Planets and Space, 61, 1313-1325. Get the inside scoop on all things TeachEngineering such as new site features, curriculum updates, video releases, and more by signing up for our newsletter! It was originally introduced by the Italian seismologist Giuseppe Mercalli in 1902, and was (2) where PGA is the peak ground acceleration (cm/s 2) and MMI is the level of macroseismic intensity in terms of MMI scale. stream Like passing train, Books off shelves. The Rossi-Forel scale is relatively old, has values from 1 to 10, and is still used in some countries. Pull over, stop, and engage the handbrake. Note that the scale is based on vibration experienced at a particular site. Thanks for your feedback! After that, on 5th May 1930, a Mw-7.3 earthquake occurred again in southern Myanmar, generating a maximum MMI level of IX. In summary, the data of macroseismic intensity obtained from these 10 collected isoseismal maps have a MMI level in the range of II-IX and so cover almost all of the standard MMI levels (i.e., I-XII), to allow an investigation into the relationship between the MMI and PGA. WebThe effect of an earthquake on the Earth's surface is referred to as its intensity. Make sure you understandEarthquake! However, according to the limitation of the political and economic situation, seismic hazard assessment and action is seemingly not recognized within the top priorities in Myanmar.
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