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The source parameters of the Yajiang earthquake sequence are calculated based on spectral analysis of S wave data recorded by the Chengdu Digital Seismic Network. Analysis of the source parameters in different periods are made,The obtained results are:(1)the relationship between M S(seismic moment), M W(moment magnitude)and M L(local magnitude),which fits the data of Yajiang earthquake sequence; (2) the decreasing corner frequency from 1.4 before the M5.0 earthquake to 1.3 afterwards, and then to 1.2 after the M6.0 event; (3) the obvious difference in the source parameters between foreshocks and aftershocks,which may be indicators for earthquake prediction.
The source parameters of the Yajiang earthquake sequence are calculated based on spectral analysis of S wave data recorded by the Chengdu Digital Seismic Network. Analysis of the source parameters in different periods are made, The obtained results are: (1) the relationship between MS ( seismic moment), MW (magnitude magnitude) and ML (local magnitude), which fits the data of Yajiang earthquake sequence; (2) the decreasing corner frequency from 1.4 before the M5.0 earthquake to 1.3 afterwards, and then to 1.2 after the M6.0 event; (3) the obvious difference in the source parameters between foreshocks and aftershocks, which may be indicators for earthquake prediction.