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城市噪音主要指由于城市设施和人类活动 (如电网、管线、通讯设备、建筑物、交通等 )对电磁信号的干扰。克服城市噪音、提高信噪比是保证城市活断层的电磁探测能否成功的关键。因而 ,在福州市活断层的电磁试验探测中 ,噪音观测与分析被列为试验的一项重要内容 ① 。文中将主要讨论不同类型的噪音对高密度电法 (DC)和瞬变电磁法 (TEM)的影响 ,并提出一些实用的解决办法。试验表明 ,影响高密度电法观测质量的主要因素是地下噪音源 ,如地下管道、地下电缆等 ,地面以上噪音的影响相对较小。对于瞬变电磁法 ,不管地面以下还是地面以上的噪音源都将产生影响。但是 ,只要仪器的性能好 ,对不同噪音源采取相应的措施 ,可以获得满意的结果。
Urban noise mainly refers to the interference of electromagnetic signals due to urban facilities and human activities (such as power grids, pipelines, communications equipment, buildings, transportation, etc.). To overcome urban noise and improve signal to noise ratio is the key to ensure the success of electromagnetic detection of city active fault. Therefore, during the electromagnetic test of active faults in Fuzhou city, noise observation and analysis are listed as an important part of the experiment①. In this paper, we mainly discuss the influence of different types of noise on high density (DC) and transient (TEM) and propose some practical solutions. Experiments show that the main factors affecting the quality of high-density electrical observation are underground noise sources, such as underground pipelines and underground cables, and the influence of noise above the ground is relatively small. For transient electromagnetic methods, noise sources, both below ground and above ground, will have an impact. However, as long as the performance of the instrument is good, the appropriate measures can be taken for different noise sources to obtain satisfactory results.