地磁复转换函数在地震短临预测中的初步应用研究

采用"复转换函数"方法,应用地磁脉动信号,对天津静海地磁台地磁脉动资料,计算出各种周期的转换函数值,利用拉格朗日(Lagrange)乘数方法和单位矢量方法,推导出转换函数实部和虚部的误差估计公式,在复数最小二乘法中,采用稳健(robust)统计方法减少个别估计值的影响,分析地磁转换函数Au异常.初步结果表明:复转换函数信息更丰富,对地下电性介质的变化反应更全面、更精确,是值得深入研究的一种好的地震短临预报方法.

Preliminary study on geomagnetic complex transfer function in earthquake short-term prediction and the application

Based on the theory of geomagnetic pulse signal, applying complex transfer function method, the value of transfer function of all kinds of period is worked out based on geomagnetic data of Jinghai Seismic Station. The error estimate formula of the real and imaginary part of transfer function is obtained with Lagrange method and unit vector method. To reduce the influence of few data for the result and to analyze the abnormal change of Au , the robust statistic method is applied in the complex least squares method. The preliminary result shows that the complex transfer function reflects information for the change of underground electrical medium more comprehensively and accurately, and is a good way for studying earthquake short-term prediction.