Moment magnitude scale | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-06-17

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Moment_magnitude_scale


00:01:14 1 History
00:01:23 1.1 "Richter" scale: the original measure of earthquake magnitude
00:04:06 1.2 Single couple or double couple
00:07:37 1.3 Dislocation theory
00:09:36 1.4 Seismic moment
00:11:04 1.5 Introduction of an energy-motivated magnitude iM/isubw/sub
00:12:39 1.6 Moment magnitude scale
00:16:17 2 Current use
00:17:45 3 Definition
00:19:04 4 Relations between seismic moment, potential energy released and radiated energy
00:20:42 5 Comparative energy released by two earthquakes
00:26:12 6 Subtypes of Msubw/sub
00:28:37 7 See also
00:28:54 8 Notes
00:30:26 9 Sources
00:30:43 10 External links
00:30:52 Sources
00:31:01 External links



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SUMMARY
=======
The moment magnitude scale (MMS; denoted explicitly with Mw 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 (a measure of the "work" done by the earthquake), expressed in terms of the familiar magnitudes of the original "Richter" magnitude scale.
Moment magnitude (Mw) is considered the authoritative magnitude scale for ranking earthquakes by size because it is more directly related to the energy of an earthquake, and does not saturate. (That is, it does not underestimate magnitudes like other scales do in certain conditions.) It has become the standard scale used by seismological authorities (such as the U.S. Geological Survey), replacing (when available, typically for M  4) use of the ML (Local magnitude) and Ms (surface-wave magnitude) scales. Subtypes of the moment magnitude scale (Mww , etc.) reflect different ways of estimating the seismic moment.