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《Chinese Journal of Sinica》 1978-02
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SOURCE MULTIPLICITY OF THE MAIN SHOCK OF THE YONG SHAN-DA GUAN (永善—大关) YUNNAN EARTHQUAKE OF MAY 10, 1974

TSENG JUNG-SHENG SHI JIE-SHAN(Institute of Geophysics, National (The Seismological Bureau of Seismologlcal Bureau) Yunnan Province)  
A detailed analysis of the seismic record of the main shock of the Yong Shan-Da Guan earthquake of May 10, 1974 from different epicentral distances has shown that the source of this earthquake was characterized by a complex multiple shock series. The seismic events from more than ten shock points can be identified. Among these, the focal parameters of seven shock points were determined.In the first two or three seconds,only a few minor shocks with energy not exceeding that of magnitude 5 occurred. Following that, four shocks with greater energy nearly equal to magnitude 7 occurred at a time interval of about 60 seconds.All shocks were distributed irregularly within a region with linear dimension of 60 km. The sequence suggested a random occurrence of shocks in a weakening zone, rather than a fracture propagating regularly from one end of a fault to the other.
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