基于虚拟日变台进行地磁矢量数据日变通化方法

流动地震地磁矢量观测是一种获取地震前兆异常的方法,试验研究和观测实例表明,地震孕育引起的地磁场异常变化量级较小,因此在观测、数据处理过程中都要尽可能消除误差提高精度.本文主要从地磁矢量数据日变通化精度方面开展讨论,首先使用反距离加权插值法由泰安、武汉、崇明、杭州4个地磁台观测资料计算出蒙城地磁台相应的虚拟地磁数据,其磁偏角、水平分量、垂直分量三个要素与真实观测值的相关系数分别高达0.9987、0.9946和0.9806,验证了反距离加权插值方法对地磁观测数据空间插值的有效性.其次,选择东部和西部测区分别使用反距离加权插值方法建立各地磁矢量测点位置的虚拟日变台并用其进行通化,实例计算结果表明,该方法可有效提高日变通化精度,对于地磁台站稀疏地区更具实际应用价值.

The method of geomagnetic diurnal correction to vector geomagnetic data by virtual diurnal variation station

Mobile vector seism magnetic survey is a kind of method to obtain seismic precursor,experimentation and survey proved,the value of geomagnetic anomalies is small which caused by earthquake preparation, so we should as far as possible to elimination errors of data processing. The aim of this paper is to discuss the diurnal correction precision of vector geomagnetic data. First we used the inverse distance weighted interpolation method to obtain the virtual data of Mengcheng by observed data form Tai'an, Wuhan, Chongming and Hangzhou geomagnetic observatories, and the correlation coefficients of declination, horizontal and vertical components are 0.9987, 0.9946 and 0.9806 respectively between virtual and observed data. The result verifies that this method is effective to spatial interpolation of geomagnetic. Then we calculated the virtual diurnal variation data of vector geomagnetic points by inverse distance weighted interpolation method, and used to correct diurnal correction to vector geomagnetic points of eastern and western of monitoring area. This method can effectively improve the diurnal correction precision, and have more practical application value to geomagnetic observatory scarce area.