苏鲁豫皖地区地磁异常场时空近期动态演化特征

摘要

Based on four-phase geomagnetic vector data from 2005 to 2008 in Jiangsu-Shandong-Henan-Anhui region, the F, D, I component geomagnetic anomalous fields at the four phases are established. By analyzing the time-space dynamic evolution characteristics of geomagnetic field of the middle segment of Tanlu fault zone, it is found that the F, D, I component geomagnetic anomalous fields in this region have greatly changed and even reversed before and after Jiangxi earthquake in November 2005, but from Spring of 2007 to Spring of 2008 the geomagnetic anomalous field distribution in this region basically keeps steady.%以苏鲁豫皖地区2005年至2008年四期地磁矢量场的观测数据为基础,分别建立了该区域的F、D、I三个独立分量四期的地磁异常场模型.通过对郯庐断裂带中段地磁异常场时空动态演化特征分析,发现该区域的F、D、I分量地磁异常场形态在2005年11月九江地震前后出现了较大程度的变化,甚至出现了地磁正负异常场的反转,从2007年春季至2008年春季,该区域地磁异常场分布形态基本保持稳定.