what is the difference between richter and moment magnitude?
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The Richter scale rates earthquakes based on the size of their seismic waves, as measured by seismographs. The moment magnitude scale rates earthquakes based on the total amount of energy they release.
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Answer: moment of inertia & moment of force does not have same dimension.
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Quakes can strike near the surface or deep within the Earth. Most quakes occur at shallow depths, according to the U.S. Geological Survey. ... Shallow quakes generally tend to be more damaging than deeper quakes. Seismic waves from deep quakes have to travel farther to the surface, losing energy along the way.
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As nouns the difference between magnitude and significance is that magnitude is (uncountable|countable) the absolute or relative size, extent or importance of something while significance is the extent to which something matters; importance.
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Intensity: The severity of earthquake shaking is assessed using a descriptive scale – the Modified Mercalli Intensity Scale. Magnitude: Earthquake size is a quantitative measure of the size of the earthquake at its source. The Richter Magnitude Scale measures the amount of seismic energy released by an earthquake.
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Earthquakes and volcanic eruptions are different because (tectonic, i.e. powerful) earthquakes are vibrations travelling through the Earth that are produced by the tectonic plates of the crust slipping past each other, whereas volcanic eruptions are (for the most part) simply molten crust needing to escape at the ...
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Explain the difference between a focus and an epicenter. The focus is the actual point of rock breakage or movement. ... The epicenter is the point on the surface of the Earth directly above the focus. Name the three types of earthquake waves.
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While deep quakes may be less dangerous, they tend to be felt by more people, explains the USGS. Large deep-focus earthquakes may be felt at great distance from their epicenters. ... Deep quakes are more rare than shallow quakes.
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Ground shaking is the primary cause of earthquake damage to man-made structures. Many factors influence the strength of earthquake shaking at a site including the earthquake's magnitude, the site's proximity to the fault, the local geology, and the soil type.
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The difference in speeds of the P and S waves provide a way to locate the epicenter. The P waves always "wins the race" and the S waves is always the slower "car". The longer the "race", the greater the difference will be in between the arrival times of the P and S waves at the "finish line" (seismic station).
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While the formulas are similar, Torque relates to the axis of rotation driving the rotation, while moment relates to being driven by external force(s) to cause the rotation. Moment is a general term and when used in context of rotational motion is pretty much the same. Torque is →r×→F.
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Moderate: 5 - 5.9. A moderate earthquake registers between 5 and 5.9 on the Richter scale and causes slight damage to buildings and other structures. There are about 500 of these around the globe every year. An earthquake of magnitude 5.5 struck the border between Quebec, seen here, and Ontario in June 2010.
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Magnitude is expressed in whole numbers and decimal fractions. For example, a magnitude 5.3 is a moderate earthquake, and a 6.3 is a strong earthquake. Because of the logarithmic basis of the scale, each whole number increase in magnitude represents a tenfold increase in measured amplitude as measured on a seismogram.
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The magnitude of an earthquake is determined from the logarithm of the amplitude of waves recorded by seismographs. Adjustments are included in the magnitude formula to compensate for the variation in the distance between the various seismographs and the epicenter of the earthquakes.
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A moment is an ambiguous unit of time, it could be anywhere between a few milliseconds and 3 seconds (not necessarily limited to 3 seconds). A second is a precise unit of time, precisely equal to 9,192,631,770 cycles of the radiation that gets an atom of the element called cesium to vibrate between two energy states1.
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The difference is in the intensity of the quake. The initial quake always has the greatest power, or magnitude, as defined by the Richter scale. Aftershocks are smaller quakes that then occur in the general area after the main quake.
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Soil type is a critical factor, because the density of the ground has a direct effect on the amount of motion the ground will experience during a quake. Hard ground propels the energy quickly with a small amplitude, while soft ground slows the energy down and increases the amplitude of the motion.