In this paper the main characteristics of the small earthquake swar-ms in the Luchuan have been investigated by comparing with the fore-shocks of the Haicheng earthquake (Ms=7.3).It is found that seis-mic activity process of the small earthquake swarms may be divided into two stages which are distinguished by maximum earthquake.The first stage is basically in agreement with foreshocks.There are clear differences between the late stage sequence and the foreshocks in manner of frequency attenuation,the rate of strain release and the stationary of focal mechanism.It is believed that these differences are criterion of distinguishing foreshocks from small earthquake swarms. It is shown that the messages of judging small earthquake swarms or foreshocks can be found by comparing small earthquake swarms with foreshocks.These messages are useful in earthquake prediction.
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李家发,吴时平,莫敬业.广西陆川小震群特征的初步研究[J].地震工程学报,1982,4(2):21-30. Li jia-fa, Wu Shi-ping, Me Jing-Yie. PRELIMINARY STUDY OF CHARACTERISTICS OF THE SMALL EARTHQUAKE SWARMS IN THE LUCHUAN OF GUANGXI[J]. China Earthquake Engineering Journal,1982,4(2):21-30.