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The Richter scale [1] (/ ˈ r ɪ k t ər /), also called the Richter magnitude scale, Richter's magnitude scale, and the Gutenberg–Richter scale, [2] is a measure of the strength of earthquakes, developed by Charles Richter in collaboration with Beno Gutenberg, and presented in Richter's landmark 1935 paper, where he called it the "magnitude scale". [3]
A particular problem was that the M s scale (which in the 1970s was the preferred magnitude scale) saturates around M s 8.0 and therefore underestimates the energy release of "great" earthquakes [13] such as the 1960 Chilean and 1964 Alaskan earthquakes.
Second, Richter arbitrarily defined the zero point of the scale to be where an earthquake at a distance of 100 km makes a maximum horizontal displacement of 0.001 mm (1 μm, or 0.00004 in.) on a seismogram recorded with a Wood-Anderson torsion seismograph. [14]
The earthquake was first registered as having a preliminary magnitude of 6.6, but USGS updated it to 7.0. It appears to have an epicenter at the triple junction of the Pacific, North American and ...
A magnitude 7.0 earthquake was recorded in Northern California, ... It's a logarithmic scale, meaning each number is 10 times as strong as the one before it. So a 5.0 earthquake is ten times ...
A pie chart comparing the seismic moment release of the three largest earthquakes for the hundred-year period from 1906 to 2005 with that for all earthquakes of magnitudes <6, 6 to 7, 7 to 8, and >8 for the same period. The 2011 Japan quake would be roughly similar to Sumatra. Earthquakes of magnitude 8.0 and greater from 1900 to 2018.
A 7.0 magnitude earthquake was reported off the coast of Northern California on Thursday, according to the United States Geological Survey. The epicenter of the "strong" quake was off the coast ...
The Japan Meteorological Agency (JMA) Seismic Intensity Scale [a] (known in Japan as the Shindo seismic scale) [1] [2] is a seismic intensity scale used in Japan to categorize the intensity of local ground shaking caused by earthquakes. The JMA intensity scale differs from magnitude measurements like the moment magnitude (Mw) and the earlier ...