What's Japan Earthquake 2011's seismic moment scale and Richter Scale

[From: ] [author: ] [Date: 12-05-22] [Hit: ]

and i've been looking picture of it with seismogram

please help me

The seismic moment (Mw) was 9.0; the Richter body wave magnitude (Mb) was 7.2

http://www.ngdc.noaa.gov/nndc/struts/res…

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