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    • Earthquake magnitude

      • Earthquake magnitude. Earthquake magnitude is a measure of the “size,” or amplitude, of the seismic waves generated by an earthquake source and recorded by seismographs.
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  2. Earthquake Magnitude, Energy Release, and Shaking Intensity › natural-hazards › earthquake-hazards
    • Magnitude. Sketch of a traditional seismometer. (Public domain.) The time, location, and magnitude of an earthquake can be determined from the data recorded by seismometer.
    • Energy Release. Earthquake magnitudes and energy release, and comparison with other natural and man-made events. (Courtesy Incorporated Research Institutes for Seismology, IRIS.)
    • Intensity. Did You Feel It? map for the M6.0 Napa, California earthquake on August 24, 2014. The earthquake epicenter is shown as a star, and the geocoded intensities are shown as small colored squares.
    • Examples. These examples illustrate how locations (and depth), magnitudes, intensity, and faults (and rupture) characteristics are dependent and related.
  3. Earthquake Glossary › learn › glossary

    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 ...

  4. Moment magnitude, Richter scale - what are the different ... › faqs › moment-magnitude-richter-scale

    Earthquake size, as measured by the Richter Scale is a well known, but not well understood, concept. The idea of a logarithmic earthquake magnitude scale was first developed by Charles Richter in the 1930's for measuring the size of earthquakes occurring in southern California using relatively high-frequency data from nearby seismograph stations.

  5. Earthquake Magnitude Scale - Michigan Technological University › UPSeis › magnitude

    Magnitude: Earthquake Effects: Estimated Number Each Year: 2.5 or less: Usually not felt, but can be recorded by seismograph. 900,000: 2.5 to 5.4: Often felt, but ...

    Earthquake Effects
    Estimated Number Each Year
    2.5 or less
    Usually not felt, but can be recorded by ...
    2.5 to 5.4
    Often felt, but only causes minor damage.
    5.5 to 6.0
    Slight damage to buildings and other ...
    6.1 to 6.9
    May cause a lot of damage in very ...
    • 8 or more
    • 5-5.9
    • 7-7.9
    • 6-6.9
  6. Earthquake - Earthquake magnitude | Britannica › Earthquake-magnitude

    Earthquake magnitude Earthquake magnitude is a measure of the “size,” or amplitude, of the seismic waves generated by an earthquake source and recorded by seismographs. (The types and nature of these waves are described in the section Seismic waves.)

  7. Richter magnitude scale - Wikipedia › wiki › Richter_magnitude_scale

    The Richter scale – also called the Richter magnitude scale or 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.

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