CAJ | 학술논문

2009年利用大功率人工源极低频电磁技术(CSELF)在位于华北、华南、东北、西北和西南的12个地震台站和几个流动观测点进行了连续30天新的观测试验.结果表明,利用CSELF技术可以在1700 km之外测量到人工源电磁场信号,计算得到的电、磁场功率谱密度和视电阻率与天然源信号相比,抗干扰能力更强,观测信号更稳定,特别有利于识别和捕捉地震等诱发的电磁异常现象,在地震预测监测中具有很大的研究应用潜力.试验还发现,各地震台站和流动测点观测的CSELF信号的强度,与台站或者测量的电、磁场分量相对于发射源的距离、方位有明显的关系;发现在离开发射源的相对近区,场强随距离的衰减,比在相对远区更快;发现接收磁场信号比电场信号较易获得更高信噪比的数据.
2009년이용대공솔인공원겁저빈전자기술(CSELF)재위우화북、화남、동북、서북화서남적12개지진태참화궤개류동관측점진행료련속30천신적관측시험.결과표명,이용CSELF기술가이재1700 km지외측량도인공원전자장신호,계산득도적전、자장공솔보밀도화시전조솔여천연원신호상비,항간우능력경강,관측신호경은정,특별유리우식별화포착지진등유발적전자이상현상,재지진예측감측중구유흔대적연구응용잠력.시험환발현,각지진태참화류동측점관측적CSELF신호적강도,여태참혹자측량적전、자장분량상대우발사원적거리、방위유명현적관계;발현재리개발사원적상대근구,장강수거리적쇠감,비재상대원구경쾌;발현접수자장신호비전장신호교역획득경고신조비적수거.
The new experiment of 30 days was carried out at twelve earthquake monitoring stations and a few mobile observatories located in North,South,NE,NW and SW China using Control Source Extremely Low Frequency (CSELF) electromagnetic technique in 2009. The measurement indicates that the artificial electromagnetic signals can be recorded at stations as far as 1700km from the transmitter. The measured electric and magnetic fields and apparent resistivity using CSELF signals have much more powerful ability to resist the interference of cultural noise in comparison to natural electromagnetic signals. They are much more stable than those using natural signals, which is favorable to identifying the anomalous phenomena caused by earthquake. The experiment shows that CSELF is potentially valuable for earthquake research and prediction. It is also found that the recorded electric and magnetic component amplitude of CSELF signal varies depending on the distance and azimuth of the observatories relative to the transmitter. These amplitudes decline with increasing distance between observatory and transmitter faster within some space extent than those outside the extent. It may be easier for magnetic components to have higher ratio of signal to noise than for electric component.