【摘要】 选取距汶川地震震中较近的4个地磁台(成都台(CDP)、重庆台(COQ)、西昌台(XIC)、汉中台(HZH))5a的数据,在时序上分段计算2007-07~2012-06地磁Z分量的近似熵。结果表明,4个台近似熵的变化显示出年变曲线,但在变化幅度上差异较大。距震中最近的成都地磁台Z分量的近似熵在震前和震后4a变化幅度异常大,重庆台次之,而其他2个台同一时段幅度差异相对较小。这种明显变化可能与汶川地震的孕育过程相关联。更多还原

【Abstract】 Approximate entropy is a quantitative description of the nonlinear dynamics of the complexity of the system changes.In this paper,The geomagnetic Z-component approximate entropy is estimated on four stations(CDP,COQ,XIC and HZH)from July 2007 to June 2012,respectively.The results show that the entropy changes dramatically before the Wenchuan earthquake on four stations,but the biggest change is in CDP(Chengdu station).The preliminary view is that this process is associated with the Wenchuan earthquake gestation process,and the change amplitude may be related to the epicentral distance.This result is beneficial to exploration of the seismogenic mechanism and large earthquake prediction.更多还原