地电场多测向日变波形相位关联特征  

Phase correlation features of geoelectric field diurnal waveforms in multi-orientation

作　　者：辛建村 谭大诚[1,2] 

机构地区：[1]中国地震局兰州地震研究所,中国兰州730000 [2]兰州地球物理国家野外科学观测研究站,中国兰州730000

出　　处：《地震学报》2017年第4期604-614,共11页Acta Seismologica Sinica

基　　金：中国地震局监测预报司2017年专项任务(2017020401);国家自然科学基金(41374080);甘肃省强震跟踪项目(2014007-2)共同资助

摘　　要：本文以电磁环境、装置系统、日变波形均具有代表性的海安、平凉、瓜州等7个台站为对象,基于大地电场潮汐机理和裂隙水(电荷)渗流(移动)模型,应用快速傅里叶变换和矢量分析方法,研究这7个台站在2009—2015年多个时段、多个测向的地电场日变波形的相位关系及影响因素.结果显示:多方位地电场观测的日变波形之间具有同相或反相的相位关联特征;当观测地电场的电极与仪器的连接方式确定后,不同测向地电场日变波形的相位关联即由场地岩体裂隙优势方位所决定,且这种相位关联特征具有相对稳定性.In general,recognizable diurnal variation waveforms appear at 70 percent of the more than one hundred geoelectric field stations in Chinese mainland.In this paper,we discussed seven stations including Hai＇an,Pingliang,Guazhou,which are representatively characterized by the electromagnetic environment,device system and the diurnal waveforms.Based on the tidal mechanism and the model of rock crack water seepage or the electric charges movement in crack water,and with the application of fast Fourier transform algorithm and vector analysis methods,we studied the phase correlation and influence factors of diurnal waveforms of the seven stations in multiple periods and multi-orientation during 2009—2015,and received the following conclusions：geoelectric field diurnal waveforms observed in each orientation always show the same or opposite phase correlation;the dominant orientation of rock crack will decide phase correlations among geoelectric field diurnal waveforms observed from multi-orientation when the connection mode between electrodes and the instrument is determined,and the correlations are relatively steady.

关 键 词：地电场 日变波形 多测向 相位关系 裂隙优势方位 

分 类 号：P315.722[天文地球—地震学]