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本文以几年来对海城地震宏观前兆资料系统整理和重点现象现场查实为基础,进一步研究了地震宏观前兆场的时空演变特征,各种宏观异常发展时间上的相关性,宏观异常的空间分布与活动断裂的关系。阐述了在地震短临孕育过程中,震前宏观异常所呈现的起伏性,空间分布上出现的密集条带、不均一和迁移性。在地震孕育的短临阶段应力的积累和加强随时间演化表现出起伏叠加,在空间上表现出孕震场内多点应力集中。并用震前宏观异常高潮期的起落对比,探索预报大地震临震的时间指标。用震前宏观异常在空间上分布的条带交叉和从外围向震中迁移的特点,探索了预报发震地点的可能性。最后对某些主要宏观异常的形成机制进行了初步讨论。
In this paper, based on the collation of the macro-precursor data system and the on-site verification of key phenomena in Haicheng earthquake in recent years, this paper further studies the temporal and spatial evolution characteristics of the macro-precursor fields, the correlations of macro-anomalous development time, the spatial distribution of macro-anomalies Active fracture relationship. In the process of short-term and short-term earthquakes, the authors describe the intensive bands, inhomogeneities and migrations that appear in the undulating and spatially distributed macroscopic anomalies before the earthquake. The accumulation and strengthening of stress in the short and late stages of the earthquake show ups and downs over time, and more spatial stress concentration in the geocentric field. And with the macro-anomalous climatic ups and downs before the contrast, exploration and prediction of large earthquakes in time indicators. The possibility of predicting the place of earthquake onset is explored by the characteristics of the spatially distributed bands crossing the macro anomaly and the migration from the periphery to the epicenter. Finally, the formation mechanism of some major macroscopic anomalies was discussed preliminarily.