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What is a seismic magnitude scale?
How do earthquake magnitudes differ from seismic intensity scales?
Which magnitude scale is valid for a specific frequency range?
What is the first scale for measuring earthquake magnitudes?
Seismic magnitude scales are used to describe the overall strength or "size" of an earthquake. These are distinguished from seismic intensity scales that categorize the intensity or severity of ground shaking (quaking) caused by an earthquake at a given location.
- Moment magnitude scale
The moment magnitude scale ( MMS; denoted explicitly with M...
- Richter scale
For large earthquakes worldwide, the moment magnitude scale...
- Moment magnitude scale
Seismic magnitude scales are used to describe the overall strength or "size" of an earthquake. 1 Earthquake magnitude and ground-shaking intensity. 2 Magnitude scales. 2.1 "Richter" magnitude scale. 2.2 Other "Local" magnitude scales. 2.2.1 Japan Meteorological Agency magnitude scale. 2.3 Body-wave magnitude scales. 2.3.1 mB scale. 2.3.2 mb scale.
Magnitude Types; Magnitude Type Magnitude Range Distance Range Equation Comments; Mww (Moment W-phase)(generic notation Mw) ~5.0 and larger: 1 - 90 degrees: M W = 2/3 * (log 10 (M O) - 16.1), where M O is the seismic moment. Note this is also unit-dependent; the formula above is for moment in dyne-cm.
These include body wave magnitude ( Mb) and surface wave magnitude ( Ms). Each is valid for a particular frequency range and type of seismic signal. In its range of validity, each is equivalent to the Richter magnitude. Because of the limitations of all three magnitude scales (ML, Mb, and Ms), a new more uniformly applicable extension of the ...
Learn about the moment magnitude scale, a quantitative measure of earthquake size based on seismic moment and fault geometry. Compare it with other scales and avoid magnitude saturation problems.
