鲜水河断裂带近20年磁场变化特征

The variation characteristics of magnetic field on the Xianshuihe Fault during the last 20 years

通过对流动地磁重复测量数据的计算处理,得出鲜水河断裂带上各测点相邻两期的磁场总强度变化,使用surfer软件绘制出鲜水河断裂带上磁场变化的时空分布。由图分析鲜水河断裂带的磁场变化特征,并着重探究鲜水河断裂带2000年至2003年的活动情况以及从磁力资料方面来分析汶川地震对鲜水河断裂带的影响。

After calculating and processing the historical data of mobile-geomagnetic-remeasurement by academy of surveying and mapping engineering which is part of the Sichuan Seismological Bureau,the variable quantity of the survey points laid on the Xianshuihe Fault can be obtained,that can reflect the variation of total geomagnetism intensity in two adjacent measurement periods. Then,the diagram about the space-time distribution of magnetic field on the Xianshuihe Fault can be drawn by the surfer software. We can analyze the characteristics of variation which is about the magnetic field on the Xianshuihe Fault. Then we can focus on the activities of the Xianshuihe Fault from 2000 to 2003,and analyze the influence that the Wenchuan earthquake took to the Xianshuihe Fault.