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- USGS: Magnitude-7.5 earthquake strikes northern Peru - ABC ...USGS: Magnitude-7.5 earthquake strikes northern Peru. An earthquake with a preliminary magnitude of 7.5 struck northern Peru early Sunday, damaging some buildings and blocking several roads with ...
- Magnitude 7.2 Earthquake in Haiti | U.S. Geological SurveyA magnitude 7.2 (M 7.2) earthquake struck Haiti on August 14, 2021, at 8:29 am local time (August 14, 2021 12:29 UTC).
- Moment magnitude scale - WikipediaThe moment magnitude scale (MMS; denoted explicitly with M w or Mw, and generally implied with use of a single M for magnitude) is a measure of an earthquake's magnitude ("size" or strength) based on its seismic moment.It was defined in a 1979 paper by Thomas C. Hanks and Hiroo Kanamori.Similar to the local magnitude scale (M L ) defined by Charles Francis Richter in 1935, it uses a ...
- Richter magnitude scale - WikipediaThe Richter scale – also called the Richter magnitude scale and Richter's magnitude scale – is a measure of the strength of earthquakes, developed by Charles Francis Richter and presented in his landmark 1935 paper, where he called it the "magnitude scale". This was later revised and renamed the local magnitude scale, denoted as ML or M L . [citation needed]
- Earthquake Glossarymagnitude. The magnitude is a number that characterizes the relative size of an earthquake. Magnitude is based on measurement of the maximum motion recorded by a seismograph.Several scales have been defined, but the most commonly used are (1) local magnitude (ML), commonly referred to as "Richter magnitude", (2) surface-wave magnitude (Ms), (3) body-wave magnitude (Mb), and (4) moment ...
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