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The Mineral, Virginia (USA), earthquake occurred at 17:51:3.9 UTC (Coordinated Universal Time) on 23 August 2011; the hypocenter was at 37.905°N, 77.975°W and depth was 8 km. The widely reported moment magnitude (Mw) was 5.7 ± 0.1. The mb (teleseismic short-period) magnitude estimated here using 26 global network stations is 5.77 ± 0.23, in agreement with mb values reported by national and international data centers, and not significantly different from Mw. However, the mbLg magnitude of the earthquake determined here using 386 stations in eastern North America is 6.28 ± 0.26. The m...

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