【摘要】 对7次巨幅形变异常事件研究后认为:1)巨幅形变事件是指与其自身本底变化幅度相比相差悬殊的形变事件,如半年至一年的变化幅度,超过前3年内最大变幅的4倍,即可将此判定为巨幅形变事件;2)形变异常与干扰共存;3)形变与干扰一般情况下难以区分和识别,但巨幅形变事件不是一般干扰单独引起的,出现巨幅形变事件,应首先考虑是否属于近区域、中短期的强震的前兆异常;4)对于强震,近区域中短期应存在超大幅度的地壳形变,监测巨幅形变异常对地震预报意义重要。更多还原

【Abstract】 7 events of crust deformation anomaly with great magnitude are given,and,these events always were followed by strong earthquake near the abnormal area in a medium-short period.The reason why such kind of important phenomena has not drawn more attention to yet is analyzed.Furthermore some new understandings of the relationship between crust deformation anomalies and disturbances are presented,and some conclusions and suggestions are given as follows.1)As concerning crustal deformation event of great magnitude,"great magnitude" means that the event has a big difference from the varied magnitude in normal time.The index has be given here that during a half year to one year,if the varied magnitude is more than 4 times of that for 3 years before the event,the event can be looked as crustal deformation event of great magnitude.2)Crust deformation anomaly is coexistent with disturbances.3)It is difficult to distinggaish between crust deformation and disturbance in most of situation.But crustal deformation of great magnitude has special value for strong earthquake prediction,because this kind of deformation can not be induced commonly by disturbance alone.When the crustal deformation of great magnitude appears,we should look it as the precursory anomaly first for near strong earthquake in a medium-short time period.4)Before strong earthquake,crustal deformation of great magnitude should appear at some key points in the medium-short period.Monitoring such great deformation has important significance for effective prediction of strong earthquake.更多还原