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目前,在地震时、空、强诸方面的研究中,对震级的分布规律及表征其统计特征的b值研究较多,震级一频度关系式logN=a—bM已被普遍接受,并应用于地震预报。但对于地震的空间分布,这个描述地震活动性很重要的一个方面,则研究较少。事实上,地震观测表明,在大震孕育过程中,在相当大的区域内,都伴随有大量的地震活动,不但会使b值发生改变,而且地震的空间分布图象也会有变化。在实际地震预报中人们也常常通过分析地震活动的空间分布图象变化,来对未来的地震形势作出判断。例如不少人探讨
At present, there are many researches on the distribution of magnitude and the b value characterizing its statistical characteristics in the study of earthquakes, the emptiness and the strong aspects. The logN = a-bM of magnitude-frequency has been universally accepted and applied In earthquake prediction. But for the spatial distribution of earthquakes, one area where seismicity is very important is less studied. In fact, the seismological observations show that during the geo-genesis of large earthquakes, a large amount of seismic activity accompanied by a large area will not only change the b value but also change the spatial distribution of the earthquake. In actual earthquake prediction, people often judge the future earthquake situation by analyzing the spatial distribution of seismic activity. For example, many people explore