Abstract: Based upon data for the Haicheng earthquake and the field investigations the further study is made for the temporal and spatial change of macroscopic field of precursors,the temporal correlation of the developing anomalies and the relation of their spatial distribution with the active faults.Described here are such aspects as fluctuations shown by macroscopic anomalies during the preparation of an impending earthquake,distributions characterized by the closely spaced belts and their inhomogeneity and migration.Building up and strenthening of stresses in the preparation of an impending shock may vary with time,spatially concentrated to various points in a stress field.With the comparision of the fluctuations in rapidly developing anomalies prior to occurrence of an earthquake,the time scale is excplored for predicting a major impending shock. The possible sites for future shocks are discussed on the basis of the spatial distribution of crossbelt anomalies,which is characterized by their migrating to epicenters from the outer.Finally,a few mechanisms are preliminarily investigated for the generation of main macroscopic anomalies.

摘要： 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。