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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]
Much of an earthquake's total energy as measured by M w is dissipated as friction (resulting in heating of the crust). [52] An earthquake's potential to cause strong ground shaking depends on the comparatively small fraction of energy radiated as seismic waves, and is better measured on the energy magnitude scale, M e. [53]
The moment magnitude scale (MMS; denoted explicitly with M or M w or Mwg, and generally implied with use of a single M for magnitude [1]) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment.
A pair of earthquakes with magnitudes of 4.2 and 4.4 shook Northern California, the U.S. Geological Survey reported.. The first and smaller quake was 3.3 miles deep and hit 3.7 miles from Belden ...
The Modified Mercalli intensity scale (MM, MMI, or MCS) measures the effects of an earthquake at a given location. This is in contrast with the seismic magnitude usually reported for an earthquake. Magnitude scales measure the inherent force or strength of an earthquake – an event occurring at greater or lesser depth. (The "M w" scale is ...
Anyone who felt the earthquakes can report them to ... The state Department of Health and Environmental Control said that mining activity is not likely to be the ... 1.4. 2.9. Jan. 11/Elgin. 1.7. 5.4.
Differences in the crust underlying North America east of the Rocky Mountains makes that area more sensitive to earthquakes. Shown here: the 1895 New Madrid earthquake, M ~6, was felt through most of the central U.S., while the 1994 Northridge quake, though almost ten times stronger at M 6.7, was felt only in southern California.
This was the fifth earthquake recorded in South ... Anyone who felt tremors and shaking or heard rumbling from Tuesday night’s earthquake can report it to ... 2.4. 2.4. Feb. 28/Elgin. 1.3. 2.5.