【摘要】 利用一些大地震前观测到的短临和临震地震前兆异常资料,综述了多年来长周期形变波观测事实和研究状况。利用地震前后记录到的典型震例异常图像的特点、形态、量级,多层次分析了长周期形变波的异常持续时间,有效监测范围,主震震级范围,异常形态,周期及传播速度特性。结果表明:长周期形变波异常持续时间多为震前几个小时到6.5天,对应地震的震级大于6.0级以上,有效距离范围100～2 000 km。更多还原

【Abstract】 Selecting a great deal data of short-impending and impending earthquake precursory,and citing the recordings of the observational long-period deformation wave,we overview the research on the long-period deformation wave.Then we analyze the feature,shape and amplitudes of the anomalous images of the deformation wave of some typical earthquakes recorded by tidal deformation instruments before and after the earthquake to study the features of the long-period wave—duration of anomaly,effective monitoring rang,main shock magnitude range,anomaly shapes,period and propagation velocity.The results show that the duration of deformation anomaly extends from several hours to 6.5 days.The magnitude of the predicted earthquake is greater than 6.0 and the effective distance range is from 100 km to 2 000 km.更多还原