长沙台前兆数字化与模拟资料的对比分析

Contrast and analysis of the digital and analog data at Changsha Seismostation

长沙地震台为国家基准台,目前由模拟观测项目改造为数字化观测项目的有FSQ浮子水管倾斜仪、LN-3水位仪、DN-3气氡仪。通过对长沙台地倾斜、水位固体潮观测的一致性、内在质量的对比研究,认为数字化地倾斜观测提高了观测质量的精度和稳定性,但与模拟观测之间存在较大的系统偏差;而水位的数字化与模拟观测,因其观测的原理存在差异,虽然二者的趋势变化一致、内在质量相当,但其精度和稳定性却存在较大差异。

Changsha Seismostation is one of the datum seismostations in the country. At present, analog observation items such as water tube tiltmeter, water level and Rn have been turned into digital observation. By comparing the digital data with the analog ones, we find that the digital data from water tube tiltmeter are in favor of the stability and accuracy but have some system deviation to the analog data. In water level, analog observation and digital observation are difference in nature. Two kinds of data are consistent in trend and natural quality but different in stability and accuracy.