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What is a seismic magnitude scale?
What is the first scale for measuring earthquake magnitudes?
What is the difference between a Richter scale and a moment magnitude scale?
What is a surface wave magnitude scale?
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. 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.
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.
Based on the scalar seismic-moment of the earthquake, derived from moment tensor inversion of the whole seismogram at regional distances (~10-100 s; pass band based on size of EQ). Source complexity and dimensions at larger magnitudes (~M7.0 or greater) generally limits applicability.
The moment magnitude scale considers the fault’s geometry (the angle and other qualities of the plane that characterize the fault that ruptures during an earthquake) and the earthquake’s seismic moment (that is, the displacement of the fault across its entire surface multiplied by the force used to move the fault).
