The moment magnitude scale was introduced in 1979 as a. Intensity X (10) is the highest value on the MMI. The moment magnitude scale is another earthquake measurement scale used by some seismologists. As the level rises toward the larger numbers, the amount of damage increases considerably. At this level doors would rattle, dishes break and weak or poor plaster would crack. For example a level I-V on the Mercalli scale would represent a small amount of observable damage. The moment magnitude scale, in use since 1993, is more accurate for large earthquakes it takes into account the amount of fault slippage, the size of the area ruptured, and the nature of the materials that faulted. Thus, the magnitude scale is considered scientifically more objective and therefore more accurate. From a scientific standpoint, the magnitude scale is based on seismic records while the Mercalli is based on observable data which can be subjective. The Mercalli Scale is based on observable earthquake damage. In the United States, we use the Modified Mercalli (MMI) Scale. smaller magnitude (range is -3.0 to 10.0) The difference between these two magnitudes is. Details of how these scales compare are discussed by Rick Aster on page 8 and 9 of the Spring, 2002 issue of Lite Geology. larger magnitude (range is -3.0 to 10.0) than a magnitude. Sometimes earthquakes are referred to by the maximum intensity they produce. The moment magnitude scale is now most commonly used for medium to large earthquakes. An earthquake causes many different intensities of shaking in the area of the epicenter where it occurs. So the intensity of an earthquake will vary depending on where you are.
Intensity scales, like the Modified Mercalli Scale and the Rossi-Forel scale, measure the amount of shaking at a particular location. This happens because the relation between the seismic measurements and the magnitude is complex and different procedures will often give slightly different magnitudes for the same earthquake. Often, several slightly different magnitudes are reported for an earthquake.
The magnitude does not depend on where the measurement is made. Magnitude scales, like the moment magnitude, measure the size of the earthquake at its source.
0 kommentar(er)
