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利用地磁内外源场分离的方法,反演得到了1997年11月8日玛尼地震和1998年1月10日张北地震前地下和空间等效电流体系的演化图象,并分析研究了地磁低点位移出现前后等效电流体系变化特征.结果表明,内、外场等效电流体系的变化与地震“低点位移”异常现象有着内在的联系,等效电流体系变化可能是地磁低点位移异常现象产生的原因之一.随着我国地磁台站的加密建设,势必可以得到更为精确的地磁场等效电流体系的演化特征,更有利于地震预测的研究.
Using the method of geomagnetic separation from the external field, the evolution images of the underground and space equivalent current system before the Mani earthquake on November 8, 1997 and before the Zhangbei earthquake on January 10, 1998 were obtained by inversion. The geomagnetic The results show that the variation of the equivalent current system inside and outside the field is intrinsically related to the anomalies of “low displacement” of earthquakes, and the change of the equivalent current system may be the result of the geomagnetic low point One of the causes of the abnormal displacement phenomenon.With the construction of the geomagnetic encryption station in our country, it is bound to get the more accurate evolution characteristics of the equivalent current system of the geomagnetic field, which is more conducive to the study of earthquake prediction.