安徽阜阳4.3级地震前电磁扰动异常分析

Anomalous Variation of Electromagnetic Disturbance at Huainan Station before the Fuyang M4.3 Earthquake in Anhui Province

本文采用超限率方法分析了淮南台2013~2015年电磁扰动数据,结果发现2015年3月14日安徽阜阳4.3级地震前40天左右电磁扰动脉冲超限频次和超限幅度均出现明显的增强,异常持续10天;进一步分析了该台异常时段电磁扰动的脉冲的时间分布及日变化,认为2015年淮南台电磁扰动脉冲增强变化与阜阳4.3级地震具有明显的相关性。

The ground geomagnetic observation environment has seriously been affected by increasingly complex e- lectromagnetic interferences. The underground observation, however, can effectively avoid and suppress the electro- magnetic shallow surface interference. The underground observation provides a new idea for obtaining effective mag- netic field data. Since the underground observation time is short, and whether the changes of geomagnetic field long and short cycle accord with the earth magnetic field change is still a scientific problem that needs to be solved. In this paper, the geomagnetic field observation data from Luanxian deep well station are compared with that from adjacent Changli platform and Dalian platform. The results show that the data changes of Luanxian deep well station is consistence with the data changes from Changli and Dalian geomagnetic observation.