enow.com Web Search

Search results

  1. Results from the WOW.Com Content Network
  2. Richter scale - Wikipedia

    en.wikipedia.org/wiki/Richter_scale

    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]

  3. Seismic magnitude scales - Wikipedia

    en.wikipedia.org/wiki/Seismic_magnitude_scales

    The original "body-wave magnitude" – mB or m B (uppercase "B") – was developed by Gutenberg 1945c and Gutenberg & Richter 1956 [25] to overcome the distance and magnitude limitations of the M L scale inherent in the use of surface waves. mB is based on the P and S waves, measured over a longer period, and does not saturate until around M 8.

  4. Lists of earthquakes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_earthquakes

    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.

  5. 1949 Queen Charlotte Islands earthquake - Wikipedia

    en.wikipedia.org/wiki/1949_Queen_Charlotte...

    The earthquake had a moment magnitude of 8.0 [4] and a surface-wave magnitude of 8.1. The maximum Mercalli Intensity in the event was VIII (Severe). The interplate earthquake began in the ocean bottom just off the rugged coast of Graham Island. It ruptured along the Queen Charlotte Fault both northward and southward more than 500 km (311 mi).

  6. Surface-wave magnitude - Wikipedia

    en.wikipedia.org/wiki/Surface-wave_magnitude

    This magnitude scale is related to the local magnitude scale proposed by Charles Francis Richter in 1935, with modifications from both Richter and Beno Gutenberg throughout the 1940s and 1950s. [1] [2] It is currently used in People's Republic of China as a national standard (GB 17740-1999) for categorising earthquakes. [3]

  7. Lists of 20th-century earthquakes - Wikipedia

    en.wikipedia.org/wiki/Lists_of_20th-century...

    Earthquakes of magnitude 8.0 and greater from 1900 to 2018. The apparent 3D volumes of the bubbles are linearly proportional to their respective fatalities. [1] This list of 20th-century earthquakes is a list of earthquakes of magnitude 6 and above that occurred in the 20th century. Sone smaller events which nevertheless had a significant ...

  8. Megathrust earthquake - Wikipedia

    en.wikipedia.org/wiki/Megathrust_earthquake

    The largest megathrust event within the last 20 years was the magnitude 9.0–9.1 Tōhoku earthquake along the Japan Trench megathrust. [20] In North America, the Juan de Fuca plate subducts under the North American plate, creating the Cascadia subduction zone from mid Vancouver Island, British Columbia down to Northern California.

  9. Epicentral distance - Wikipedia

    en.wikipedia.org/wiki/Epicentral_distance

    [Notes 5] In order to keep the result from being negative, Richter defined an earthquake with a maximum horizontal displacement of 1 μ m (which is also the highest accuracy and precision of the Wood Anderson torsion seismometer) recorded by the seismometer at the observation point at the epicentral distance of 100 km as a magnitude 0 ...