自然正交分量方法在地震地磁监测中的应用

Application of the Natural Orthogonal Components Method to the Seismic Geomagnetic Monitoring

对比分析了地震地磁监测中运用自然正交分量方法建立的我国地磁场长期变化模型与传统的磁场线性预测长期变化模型在地震地磁监测中的误差,发现NOC方法优于线性预测方法,应在地震地磁监测中予以推广应用。在NOC模型建立过程中,还发现NOC方法有助于提取可能与地震活动性相关的地磁场微弱能量的时间变化,但还有待于进一步的研究。

In China, there are two models for the seismological and geomagnetic observation. One is the model of geo- magnetic secular variation, which is built through the method of Natural Orthogonal Components （NOC）. Anoth- er is the linear prediction model of the secular variation of geomagnetic field. Comparing the two models, we find that the former is superior to the latter. We also find that NOC is useful to extract the weak geomagnetic variation which is possibly related with the earthGuake activity.