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<正>A Mw 6.2 Ludian earthquake struck Ludian County at 08:30:11 UTC(16:30:10.2 PM local time)on August 3rd,2014,and is one of the most destructive earthquakes which occurred on an unmapped active fault east of the Xianshuihe-Xiaojiang fault system between the Chuandian rhomb block(the Sichuan-Yunnan block),southeastern Tibetan Plateau,and the South China block,a stable tectonic terrain.Field investigation