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地震前长周期事件的研究——历史与现状
Research on Long-Period Events Before Earthquakes——History and Current Situation
【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
【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.
【Key words】 fault creep; earthquake precursor; fracture pre-propagation; anomaly of extra-low-frequency electromagnetic wave; infrasonic wave;
- 【文献出处】 国际地震动态 ,Recent Developments In World Seismology , 编辑部邮箱 ,2002年04期
- 【分类号】P315.7
- 【被引频次】18
- 【下载频次】133