Temporo-spatial Characteristics of Swarm Distribution before Two M_S6.0 Earthquakes in the Tianshan

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The Nilka-Gongliu earthquake with M_S6.0 and Xinyuan-Hejing earthquake with M_S6. 6 successively occurred in Xinjiang on November 1,2011 and June 30,2012. Massive swarm activity was observed in a large area around the main shock epicenters before the t
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