【摘要】 自 2 0世纪 60年代以来 ,已经积累了许多地震前长周期事件的观测资料。这些长周期事件可以被很多不同的观测系统记录到 ,如跨断层形变、超低频电磁异常、次声波异常、井下低频导波、井水水位等。理论上对地震前长周期事件已给出了许多论证 ,例如 ,震前的断层蠕动、静地震与慢地震、断层的断裂预扩展和地震成核等。解决震前长周期事件的地面可测性 ,对突破“震前平静”带来的短临预测的困惑会起到举足轻重的作用。目前的主要问题是缺乏网络化的系统观测和对物理机制的研究更多还原

【Abstract】 Since 1960’s,lots of observed data on long-period events before earthquakes have been accumulated.These long-period events can be recorded by various kinds of observation systems,such as dislocation across faults,anomalies of extra-low-frequency electromagnetic waves and infrasonic waves,low-frequency guided waves under wells,well water level and so on.The long-period events before earthquakes have been theoretically demonstrated by fault creep before earthquakes,silent and slow earthquakes,fracture pre-propagation of faults and fracture nucleation as well.The resolution of surface measurement of long-period events before earthquakes would play a decisive role in overcoming the difficulty of short-term and imminent earthquake predictions brought by "pre-earthquake quiet".At present,the primary problem is lack of network of observation system and research on physical mechanism.更多还原