成都基准台绝对重力复测结果分析
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摘要
2007年4月—2008年6月,用FG5/232、FG5/214绝对重力仪在成都地震基准台的绝对重力基准点进行了5次绝对重力重复观测,每次观测结果的标准偏差均小于±2×10-8ms-2,证明该绝对重力基准点环境噪声干扰小,地质条件稳定;通过对观测数据的处理和分析认为,2007年12月绝对重力值较2007年4月增大5×10-8ms-2,汶川大地震发生后,重力整体变化趋势为下降、略有升高起伏状态,但仍未恢复。
The repeat absolute gravity observation had been done five times at Chengdu station by FG5/214 and FG5/232 absolute gravimeter from April,2007 to June,2008,and every standard deviation is less than ±2×10-8ms-2.The results show that the environmental noise of Chengdu station is very little and the geologic condition is stable;and by the processing and analyzing of the observed data,it shows that the gravity values in December,2007 increased 5×10-8ms-2 than that in April,2007,after the Wenchuan Ms8.0 earthquake happened,the trend of whole gravity change has dropped and some times risen with some ascendant but still has not come back to the former normal value.
The repeat absolute gravity observation had been done five times at Chengdu station by FG5/214 and FG5/232 absolute gravimeter from April,2007 to June,2008,and every standard deviation is less than ±2×10-8ms-2.The results show that the environmental noise of Chengdu station is very little and the geologic condition is stable;and by the processing and analyzing of the observed data,it shows that the gravity values in December,2007 increased 5×10-8ms-2 than that in April,2007,after the Wenchuan Ms8.0 earthquake happened,the trend of whole gravity change has dropped and some times risen with some ascendant but still has not come back to the former normal value.
引文
1刘冬至,等.FG5/232绝对重力仪的实验观测结果[J].大地测量与地球动力学,2007,27(2):114-118.1Liu Dongzhi,et al.Experimental observation results with FG5/232abslute gravimeter[J].Journal of Geodesy and Geodynamics,2007,27(5):88-93.(in Chinese)
2刘冬至,等.中国地震重力网绝对重力观测结果的分析[J].大地测量与地球动力学,2007,27(5):88-93.2Liu Dongzhi,et al.The analysis of absolute gravity survey-ing result of China earthquake gravity network[J].Journal of Geodesy and Geodynamics,2007,27(5):88-93.(in Chinese)
3申重阳,李辉,谈洪波.汶川8.0级地震同震重力与形变效应模拟[J].大地测量与地球动力学,2008,28(5):6-12.3Shen Chongyang,Li Hui and Tan Hongbo.Simulation of co-seismic gravity changes and deformation effect of Wenchuan Ms8.0earthquake[J].Journal of Geodesy and Geodynam-ics,2008,28(5):6-12.(in Chinese)
4张为民,等.1996—2003年中国大陆高精度绝对重力观测[J].地球物理学进展,2005,20(1):204-210.4Zhang Weimin,et al.High accuracy absolute gravity obser-vation in Chinese main land during1996-2003[J].Pro-gress in Geophysics,2005,20(1):204-210.(in Chinese)
5张为民,王勇,张赤军.土壤浸湿对重力观测影响的初步分析[J].测绘学报,2000,30(2):108-111.5Zhang Weimin,Wang Yong and Zhang Chijun.The prelimi-nary analysis of the effects of the soil moisture on gravity ob-servations[J].Acta Geodaetica et Cartographica Sinica,2000,30(2):108-111.(in Chinese)
6张为民,王勇.洱海水位变化对下关基准点绝对重力观测的影响[J].大地测量与地球动力学,2005,25(4):114-116.6Zhang Weimin and Wang Yong.Effect of water level vari-tions of Erhai lake on absolute gravity observation at Xiaguan fiducial station[J].Journal of Geodesy and Geodynamics,2005,25(4):114-116.(in Chinese)
2刘冬至,等.中国地震重力网绝对重力观测结果的分析[J].大地测量与地球动力学,2007,27(5):88-93.2Liu Dongzhi,et al.The analysis of absolute gravity survey-ing result of China earthquake gravity network[J].Journal of Geodesy and Geodynamics,2007,27(5):88-93.(in Chinese)
3申重阳,李辉,谈洪波.汶川8.0级地震同震重力与形变效应模拟[J].大地测量与地球动力学,2008,28(5):6-12.3Shen Chongyang,Li Hui and Tan Hongbo.Simulation of co-seismic gravity changes and deformation effect of Wenchuan Ms8.0earthquake[J].Journal of Geodesy and Geodynam-ics,2008,28(5):6-12.(in Chinese)
4张为民,等.1996—2003年中国大陆高精度绝对重力观测[J].地球物理学进展,2005,20(1):204-210.4Zhang Weimin,et al.High accuracy absolute gravity obser-vation in Chinese main land during1996-2003[J].Pro-gress in Geophysics,2005,20(1):204-210.(in Chinese)
5张为民,王勇,张赤军.土壤浸湿对重力观测影响的初步分析[J].测绘学报,2000,30(2):108-111.5Zhang Weimin,Wang Yong and Zhang Chijun.The prelimi-nary analysis of the effects of the soil moisture on gravity ob-servations[J].Acta Geodaetica et Cartographica Sinica,2000,30(2):108-111.(in Chinese)
6张为民,王勇.洱海水位变化对下关基准点绝对重力观测的影响[J].大地测量与地球动力学,2005,25(4):114-116.6Zhang Weimin and Wang Yong.Effect of water level vari-tions of Erhai lake on absolute gravity observation at Xiaguan fiducial station[J].Journal of Geodesy and Geodynamics,2005,25(4):114-116.(in Chinese)
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