Mantle Magnitude Mm
Mantle Magnitude Mm :
The mantle magnitude Mm uses surface waves with periods between about 60 s and 410 s that penetrate into the Earth's mantle. The concept has been introduced by Brune and Engen (1969) and further developed by Okal and Talandier (1989 and 1990). Mm is firmly related to the seismic moment Mo and does not, or only marginally, saturate even for great, slow or complex earthquakes. Therefore, it is routinely used for rapid magnitude determination of great earthquakes within about 10 min after origin time in the context of tsunami early warning. See Chapter 3 of this Manual, Okal and Talandier (1989 and 1990), Weinstein and Okal (2005)
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