地壳弹性变化对潮汐倾斜、应变的影响

THE EFFECTS OF THE VARIATION OF CRUSTAL ELASTICITY ON TIDE TILT AND STRAIN

本文采用小参数扰动法,首先研究了地壳弹性局部变化对潮汐倾斜、应变的调制作用。在此基础上,定量分析和计算了地震形成过程中,潮汐倾斜和应变变化的时空分布特征。研究表明,地壳弹性局部变化对潮汐倾斜和应变的调制作用是显著的。基于扩容理论计算得到的地震形成过程中,潮汐倾斜与应变变化的动态特征是“异常—恢复—发震”,此特征与荷泽地震(M=5.9)前后,泰安台潮汐因子异常的动态特征基本一致。本文所得结果,为目前用潮汐观测手段捕捉地震信息及对一些观测资料的解释提供了一定的理论依据。

The modulation action of the local variation of crustal elasticity on tide tilt and strain is investigated by means of minor parameter method. The temporal -spatial features of change of tide tilts and strains in the process of earthquake formation are quantitatively analyzed and calculated. The research shows it is outstanding that modulation action of local variation of crustal elasticity on tide tilt and strain. The dynamic features of tide tilt and strain in the process of earthquake formation, which are computed by the dilatancy-diffusion theory, are 'anomaly -recovery-earthquake' . These features are consistent with anomaly at Taian station before and after Hece earthquake ( M=5.9). The results provided theoretic basis for pursuing ditatancy, catching earthquake information and interpreting observation data by tide observation means at present.