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Date: 2013-11-19 12:49:13Seismic scales Geophysics International Seismological Summary Richter magnitude scale Earthquake Seismotectonics Moment magnitude scale National Earthquake Information Center Surface wave magnitude Seismology Geology Mechanics | Add to Reading ListSource URL: earthquake.usgs.govDownload Document from Source WebsiteFile Size: 2,75 MBShare Document on Facebook |