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本文运用构造、前兆二判式鉴别了唐山跨断层短水准形变异常,并论述了卢龙M_L6.2级地震前的中期异常和短临前兆特征。以此为据,阐明了这次地震是在1981年下半年华北区域应力场明显加强时,唐山7.8级地震的发震断层反向逆冲异常运动所造成的。 宁河、唐山、东台子三处短水准形变异常的相应出现,再次表明即使埋设在地壳运动强烈区土层中的跨断层短水准测线亦有较好的监测地震的能力,而其所受干挠通常是可以识别和排除的。
In this paper, we use the structure and the pre-bivariate criterion to identify the short-range anomalies of Tangshan stratigraphic fault, and discuss the characteristics of medium-term anomalies and short-term precursors before Lulong M_L6.2 earthquake. Based on this, it is clarified that the earthquake was caused by the reverse thrust of the seismogenic fault of the Tangshan earthquake of magnitude 7.8 in the second half of 1981 when the stress field in North China was obviously strengthened. The corresponding occurrence of short shortening deformation anomalies in Ninghe, Tangshan and Dongtaizi shows once again that even the short-range crossing stratigraphic line surveyed in the soil layer with strong crustal motion can better monitor the seismic capacity, Dry scratching is usually recognized and ruled out.