Seismic magnitude scales are used to describe the overall strength or "size" of an earthquake. These are distinguished from seismic intensity scales that categorize the intensity or severity of ground shaking (quaking) caused by an earthquake at a given location. Magnitudes are usually determined from measurements of an earthquake's seismic waves as recorded on a seismogram. Magnitude scales vary based on what aspect of the seismic waves are measured and how they are measured. Different magnitude scales are necessary because of differences in earthquakes, the information available, and the purposes for which the magnitudes are used.
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Seismicmagnitudescales are used to describe the overall strength or "size" of an earthquake. These are distinguished from seismic intensity scales that...
science Rohn emergency scale for measuring the magnitude (intensity) of any emergency Seismic intensity scalesSeismicmagnitudescales Timeline of United...
of an earthquake than other scales, and does not saturate – that is, it does not underestimate magnitudes as other scales do in certain conditions. It...
intensity scale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismicmagnitude usually reported...
earthquakes in Japan Nuclear power in Japan (seismicity section) Seismic intensity scalesSeismicmagnitudescales The Tomakomai Shirakaba (Tomakomai Observation...
first scale for measuring earthquake magnitudes was developed by Charles Francis Richter in 1935. Subsequent scales (seismicmagnitudescales) have retained...
the limitation of seismometers designed in the early years, some seismicmagnitudescales began to show errors when the epicentral distance exceeded a certain...
visible, symbol mv Seismicmagnitudescales, the energy in an earthquake, measures include: Moment magnitudescale, based on seismic moment, supersedes...
main types of elastic body waves, called seismic waves in seismology. P waves travel faster than other seismic waves and hence are the first signal from...
A seismic wave is a mechanical wave of acoustic energy that travels through the Earth or another planetary body. It can result from an earthquake (or...
Regional Seismic Wave Propagation[dead link]. Choy, G. L.; Boatwright, J. L. (2012), "Information Sheet 3.6: Radiated seismic energy and energy magnitude", in...
1785/0120050258 Brumbaugh, D.S. (1989), "A comparison of duration magnitude to local magnitude for seismic events recorded in northern Arizona", J. Arizona-Nevada...
alters the stresses and strains on Earth's crust. Most induced seismicity is of a low magnitude. A few sites regularly have larger quakes, such as The Geysers...
and other magnitudescales developed by Western seismologists, which estimate the magnitude from the amplitude of some portion of the seismic waves generated...
building in designated cities is expected to resist. Seismic intensity scalesSeismicmagnitudescalesSeismic engineering Effectively this only applies to mainland...
location and magnitude of future seismic events. There are several interpretative factors to consider. The epicentres or foci and magnitudes of historical...
using trilateration. Epicentral distance is also used in calculating seismicmagnitudes as developed by Richter and Gutenberg. The point at which fault slipping...
triggers a tsunami of a magnitude that is very much larger than the magnitude of the earthquake as measured by shorter-period seismic waves. Volcano tectonic...
can be distinguished from aftershocks in having similar magnitudes and nearly identical seismic waveforms. Most aftershocks are located over the full area...
exceeded magnitude 5.2. An evacuation was ordered in the town of Grindavík, which is located near the area of the seismic activity. Large-scale subsidence...
November 2015. See also: Seismicmagnitudescales European Facilities for Earthquake Hazard & Risk (2013). "The 2013 European Seismic Hazard Model (ESHM13)"...
derivative with respect to time. Combining the last two equations one gets the seismic wave equation in homogeneous media ρ ∂ t 2 u i = λ ∂ i ∑ k ∂ k u k + μ...
focal depth. The focal depth can be calculated from measurements based on seismic wave phenomena. As with all wave phenomena in physics, there is uncertainty...
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