moment magnitude scale


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Noun1.moment magnitude scale - a logarithmic scale of 1 to 10 (a successor to the Richter scale) that enables seismologists to compare the energy released by different earthquakes on the basis of the area of the geological fault that ruptured in the quake
geology - a science that deals with the history of the earth as recorded in rocks
graduated table, ordered series, scale, scale of measurement - an ordered reference standard; "judging on a scale of 1 to 10"
References in periodicals archive ?
The other is less precise but suggests that the majority of lava flows came after the asteroid hit Earth, backing up the idea that the impact triggered an earthquake so massive it would have registered 11 on the moment magnitude scale, something never witnessed by humans.
Italy's national seismology institute said the quake had a magnitude of 4.8 on the open-ended Richter scale and 4.9 on the moment magnitude scale, which relates to the amount the ground slips.
At 4.2 on the Moment Magnitude scale, the quake was the largest of at least 12 reported Saturday in the United States, according to the Geological Survey.
Today, seismologists are using the Moment Magnitude Scale, which measures the size of the earthquake's fault, and how much of the earth slips at the time of the quake.
The Moment Magnitude scale rates quakes by the energy they release by calculating the area of fault rupture, the average amount of slip, and the force required to overcome the friction sticking the rocks together, according to the USGS.
The 2011 Tohoku earthquake that led to widespread devastation in Japan was vastly stronger than any of the recent quakes centered off of Alaska, ranking a 9.0 on the moment magnitude scale used by seismologists to quantify earthquakes.