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Date: 2012-07-23 17:17:46 Seismic 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 List Source URL: earthquake.usgs.gov Download Document from Source Website File Size: 2,75 MB Share Document on Facebook

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