全球超导重力仪地震频段背景噪声

Analysis of the Background Noise in the Seismic Frequency Band of the GlobalSuperconducting Gravimeter

详细研究了超导重力仪台站背景噪声水平的评估方法;基于该方法,选取了2010智利地震、2011Tohoku地震和2015智利地震前后多台超导重力观测数据,评估其在地震频段的背景噪声水平,得到了不同台站的地震噪声等级SNM;对不同超导重力仪记录背景噪声水平最低的5天进行统计分析,得出包含大震事件的多台站连续超导重力数据求取最平静期时段,大震发生前5天至大震发生后10天可不予考虑,为多台站的地震平静期时段选取提供参考。

Detailed research was conducted on the assessment methods for the background noise levels atsuperconducting gravimeter stations.Based on this method,multiple superconducting gravity observation data beforeand after the 2010 Chile earthquake,the 2011 Tohoku earthquake and the 2015 Chile earthquake were selected toevaluate the background noise levels in the seismic frequency band,and the background noise level SNM for differentstations was obtained.A statistical analysis of the 5 days with the lowest background noise levels recorded by differentsuperconducting gravimeters was performed,and the continuous superconducting gravity data of multiple stationsincluding major earthquake events were used to obtain the quietest period,the period from 5 days before theoccurrence of large earthquake to 10 days after the occurrence of a major earthquake can be disregarded,whichprovides a reference for the selection of the seismic quiet period segment for multiple stations.