山东省地磁FHD观测资料初步分析

Preliminary Analysis of Geomagnetic FHD Observation Data in Shandong Province

介绍了山东省地磁FHD观测的基本情况,选取各台2011—2015年的观测数据,从资料的连续性、完整性,仪器背景噪声,相对差值,数据变化形态及主要干扰等方面进行了分析探讨。结果表明:各台地磁FHD观测资料保持了较高的连续性和完整性,数据能满足分析预报的使用要求;仪器背景噪声良好,整体在全国省级地磁台网中处于中上水准;通过多台相对差值检测发现我省地磁FHD数据总体拟合程度较好,一致性较高,数据可靠,可为地震预测研究提供可靠的数据支持。数据变化方面,地磁静日变化平缓,曲线平滑,呈比较规则的"双峰一谷"形态,波谷时间点相对比较固定,不同季节的地磁总场F数据变化幅度存在差异;地磁扰日,特别是磁暴发生时,地磁各分量出现明显突跳,多为无规则变化形态。日常观测中,主要受到高压直流输电、信号线长度过长和交流电线路并行及人为等干扰。

Introducing the basic situation of geomagnetic FHD observation in Shandong Province, we selected the observation data by each station from 2011 to 2015 and analyzed the data＇s continuity, integrity, instrument background noise, relative difference, data change pattern and the its main interferences. The results showed that the geomagnetic FHD observation data kept high continuity and integrity and met the requirement of the analysis and forecast. Instrumental background noise aspect,on the whole,is in the middle and upper level in the provincial geomagnetic network in China. The instrument background noise is good. Through multiple sets of relative difference testing, we found that the overall fitting degree of geomagnetic FHD data in our province is better,high consistency,data is reliable,which can provide reliable data support for earthquake prediction research. on the data change aspect,The geomagnetic quiet day changes smoothly, and the curve is smooth,presenting a comparison of the rules of the ＂doublepeak and one valley＂ form,valley relatively fixed point in time. The geomagnetic field F data changes are different in different seasons. In the geomagnetic disturbed days,especially during a geomagnetic storm,geomagnetic components appear obvious jump,more irregular shape changes. Daily observation, mainly interfered by the high voltage DC transmission,the signal line length is too long and the AC lineparallel and humen.