摘要
利用中国地震局武汉九峰地震台SGC053超导重力仪超过13 000小时的重力固体潮和气压观测数据进行相关分析和积谱分析。结果表明:重力残差信号主要是由气压变化引起的,相关分析的气压导纳值为-3.116nms-2/mbar;气压导纳值和频率之间具有依赖性,气压导纳绝对值频率依赖方程为y=7.036x+2.524;利用固定气压导纳值和导纳值频率依赖的方程进行气压改正结果几乎一致,相差不超过±(1～2)nms-2。
The correlation and product spectra between the gravity earth tide for over 13 000 hours observed with SGC053 at Jiufeng station and the barometric pressure were analyzed. It is shown that the barometric pressure is the main factor leading to gravity change. And the atmospheric pressure admittance is -3.116 nms-2/mbar. The atmospheric pressure admitlance is depended on the frequency. According to the 7 product spectral lines, atmos- pheric pressure admittances was fitted with linear. The frequency-dependent atmospheric pressure admittance func- tion is y = 7. 036x ＋ 2. 524. The freq-Dep admittance correction is almost consistent with constant admittance cor- rection. The difference between the corrected results with the two methods is less than ± （1 -2） nms-2
出处
《大地测量与地球动力学》
CSCD
北大核心
2011年第4期47-51,共5页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(41004030)
中国地震局地震研究所所长基金(IS200956041)
