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地震观測主要受地震噪声的限制。有两组微压计安装在两组不同的GEOSCOPE站的地震地下观测室,一组放在SSB,另一组放在TAM。微压计显示出所有垂向分量和大多数水平分量与气压明显相关。为了校正气压噪声产生的地震信号,我们把气压值与地震数据之间的转换函数进行了反演,结果显示校正后的作用于水平分量的噪声水平两站间相同,而作用于垂向分量的噪声水平低于Peterson(1993)定义的低噪声模式。这项技术减少了部分噪声的影响,能对小震进行探测和对简正模式进行较好的提取,给出了马阔里岛M_s=8.2地震激发的地球最低简正模式的分析,并阐述了该项技术的前景。
Earthquake observations are mainly limited by seismic noise. Two sets of micro-pressure gauges were installed in two different GEOSCOPE seismic subsurface observation rooms, one on SSB and the other on TAM. Micro-pressure gauges show that all vertical and most horizontal components are significantly related to barometric pressure. In order to correct the seismic signal generated by the atmospheric noise, we invert the conversion function between the atmospheric pressure and the seismic data. The results show that the corrected noise level acting on the horizontal component is the same between the two stations and the vertical component The noise level is lower than the low noise mode defined by Peterson (1993). This technique reduces the effects of some noise, and can detect small earthquakes and extract good normal modes. The analysis of the earth's lowest normal mode stimulated by the M_s = 8.2 earthquake in the Autonomous Region of Massachusetts is given. The prospect of this technology.