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本文用P波初动半振幅和半周期直接测定介质的品质因素(Q值)和小震震源参数的方法,测定了京津地区十个区两个时间段介质的平均品质因数及小震震源参数。结果表明:唐山大震前在平谷台到唐山震区的路径上平均Q值明显的高,大约是其它区的一至二倍,并且唐山震区平均应力降最大,比其它区约大一个数量级,这说明唐山大震前这个地区介质的强度较高,整体性较强,并比其它地区积累了较高的应力。在这个基础上,对京津地区的地震趋势提出了看法。 此外,本文还给出了京津地区中小地震震源参数间的经验关系。
In this paper, the quality factor (Q value) of medium and the source parameters of small earthquakes are directly determined by the first half amplitude and half period of P wave. The average quality factor and medium earthquakes of medium in two periods parameter. The results show that the average Q value of the path from Pinggu station to Tangshan earthquake area before Tangshan earthquake is obviously high, which is about one to two times that of the other areas, and the average stress drop of the Tangshan earthquake area is the largest, about an order of magnitude larger than that of the other areas. This shows that before the Tangshan earthquake medium in this area of higher intensity, integrity is stronger, and accumulated higher stress than other areas. On this basis, we put forward some suggestions on the earthquake trends in Beijing and Tianjin area. In addition, the empirical relationship between source parameters of small and medium earthquakes in Beijing-Tianjin area is given.