THE FOCAL FAULTS OF HISTORICAL GREAT EARTHQUAKES INFERRED BASED ON CURRENT SMALL SHOCKS TAKING AN EXAMPLE OF 1830 CIXINA, HEBEI, M 7(1/2) EARTHQUAKE
Diao Guiling, Zhang Sichang, Zhao Jun, Wang Zhaojun, Wang Junguo
SEISMOLOGY AND GEOLOGY . 1999, (2): 121 -126 . 

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