一种基于地震噪声等级的陆地重力观测资料评价方法

An evaluation approach for the terrestrial gravity measurement based on the seismic noise magnitude

摘要: 本文选取GS-15型、gPhone型、PET型和CG-5型等4种陆地重力观测常用的相对重力仪，对比这几种仪器在不同背景观测环境下和不同测评时长的地震噪声等级计算结果。综合分析结果显示：金属弹簧（gPhone型、GS-15型、PET型）与石英弹簧型（CG-5型）重力仪对环境噪声的敏感性存在一定差异，但取测评时长中最平静5天和最平静1天数据所计算的地震噪声等级结果相近。因此，对于流动重力观测点，可以取最平静1天的数据来评价观测点的环境噪声水平和观测精度，可为流动重力测点选址提供方法支撑。

Abstract: In this paper, we calculated the seismic noise magnitude （SNM） of four types of relative gravimeters （GS-15, gPhone, PET and CG-5） commonly used in terrestrial gravity measurement in different environments and time intervals, and compared the corresponding results. The results show that there is quite different in sensitivity to ambient noise for the metallic spring gravimeter （GS-15, gPhone, PET） and quartz spring gravimeter （CG-5）. The SNM results are similar using the data of the quietest five-day or quietest one-day to evaluate. Therefore, it is feasible to use the quietest one-day recording to evaluate SNM value and observation precision. This result could provide a method for evaluating the conditions of the campaigned gravity survey station.