摘要
通过提出3个思考,研究了2～4 Hz干扰的性质以及演变的过程,结合仪器响应以及背景噪声分析干扰产生的原因。分析结果表明:2～4 Hz干扰已成为成都地震台测震资料中的固有干扰,2011年开始出现且现今广泛存在于成都地震台5.5级及以下且震中距大于20°的远震波形、4.5级及以下的近震波形内。成都地震台的背景噪声水平于2011～2012年陡增,2012年达到峰值。干扰的演变规律与台基背景噪声变化走势有着良好的对应关系,与仪器响应并无直接的关联性。
Putting forward three considerations,the nature and evolution of 2-4 Hz interference are studied,and the causes of interference are analyzed with instrument response and background noise.The analysis results show that 2-4 Hz interference has become the inherent interference in the seismic data of Chengdu Seismic Station.It began to appear in 2011 and now widely exists in the long-range and near-range seismic wave forms of M S5.5 and M S4.5 and below at Chengdu Seismic Station with epicenter distance greater than 20 degrees.The background noise level of Chengdu Seismic Station increased sharply from 2011 to 2012 and reached its peak in 2012.There is a good correspondence between the evolution law of interference and the trend of background noise,and there is no direct correlation with instrument response.
作者
何思源
李贵元
HE Si-yuan;LI Gui-yuan(Sichuan Earthquake Agency,Chengdu 611730,Sichuan,China)
出处
《内陆地震》
2019年第1期80-90,共11页
Inland Earthquake
基金
中国地震局测震台网青年骨干培养专项(CEA-JC/QNCZ-18242)
关键词
成都地震台
测震资料
波形干扰
背景噪声
Chengdu Seismic Station
Seismographic records
Waveform interference
Background noise
