CG-5重力仪零漂改正及格值系数检测应用研究
发布时间：2018-12-06 18:33
【摘要】：利用分测线零漂改正方法和格值系数变化检测方法,对云南重力测区2014年两期CG-5重力仪观测数据进行了精细处理,获得了该地区重力场变化,并用绝对重力观测结果进行了验证。结果表明:(1)CG-5重力仪零漂率存在明显的随时间变化,C1169和C1170两台重力仪在第一期观测时间内呈近似线性的增大趋势,变化量达20×10~(-8) m·s~(-2)·h~(-1),第二期观测时间内则趋于稳定,经零漂改正后,观测数据联测精度明显提高;(2)C1170重力仪格值系数变化发生了明显变化,变化量约为-0.000 100;(3)经格值系数改正后,获得的重力变化结果与绝对重力观测结果更为一致,重力场变化图像更为清楚地反映了昭通-鲁甸断裂两侧的差异变化和鲁甸6.5级地震的发震背景,验证了大地震一般发生在与主要活动断裂一致的重力场变化正负转换带上这一结论,说明本文所用方法能有效消除观测数据中的系统误差,有利于真实重力场变化信息的获取。
[Abstract]:Two CG-5 gravimeter observations in Yunnan gravity survey area in 2014 were carefully processed by using the zero-drift correction method and the lattice coefficient change method, and the variation of gravity field in this area was obtained. The results are verified by absolute gravity observations. The results show that: (1) the zero drift rate of CG-5 gravimeter varies obviously with time, and the C1169 and C1170 gravimeters show an approximate linear increasing trend during the first observation period. The variation is up to 20 脳 10 ~ (-8) Ms ~ (-2) h ~ (-1), but it tends to be stable during the second observation period. (2) the change of the lattice coefficient of C1170 gravimeter is about-0.000; (3) after correction of lattice coefficient, the result of gravity variation is more consistent with that of absolute gravity observation. The gravity field variation image more clearly reflects the difference between the two sides of the Zhaotong-Ludian fault and the earthquake background of the Ludian earthquake with M _ S 6.5. The conclusion that large earthquakes generally occur along the positive and negative transition zones of gravity field changes consistent with the main active faults is verified. It is shown that the method used in this paper can effectively eliminate the systematic errors in the observed data and is beneficial to the acquisition of real gravity field variation information.
【作者单位】： 中国科学院大学地球科学学院;中国地震局地震研究所;中国科学院测量与地球物理研究所;云南省地震局;
【基金】：中国地震局地震研究所所长基金(201326121);中国地震局地震行业科研专项(201308004,201508009) 国家自然科学基金(41304059) 大地测量与地球动力学国家重点实验室开放基金(SKLGED2013-1-2-EZ,SKLGED2013-1-1-Z)~~
【分类号】：P315.726
，
本文编号：2366467
[Abstract]:Two CG-5 gravimeter observations in Yunnan gravity survey area in 2014 were carefully processed by using the zero-drift correction method and the lattice coefficient change method, and the variation of gravity field in this area was obtained. The results are verified by absolute gravity observations. The results show that: (1) the zero drift rate of CG-5 gravimeter varies obviously with time, and the C1169 and C1170 gravimeters show an approximate linear increasing trend during the first observation period. The variation is up to 20 脳 10 ~ (-8) Ms ~ (-2) h ~ (-1), but it tends to be stable during the second observation period. (2) the change of the lattice coefficient of C1170 gravimeter is about-0.000; (3) after correction of lattice coefficient, the result of gravity variation is more consistent with that of absolute gravity observation. The gravity field variation image more clearly reflects the difference between the two sides of the Zhaotong-Ludian fault and the earthquake background of the Ludian earthquake with M _ S 6.5. The conclusion that large earthquakes generally occur along the positive and negative transition zones of gravity field changes consistent with the main active faults is verified. It is shown that the method used in this paper can effectively eliminate the systematic errors in the observed data and is beneficial to the acquisition of real gravity field variation information.
【作者单位】： 中国科学院大学地球科学学院;中国地震局地震研究所;中国科学院测量与地球物理研究所;云南省地震局;
【基金】：中国地震局地震研究所所长基金(201326121);中国地震局地震行业科研专项(201308004,201508009) 国家自然科学基金(41304059) 大地测量与地球动力学国家重点实验室开放基金(SKLGED2013-1-2-EZ,SKLGED2013-1-1-Z)~~
【分类号】：P315.726
，
本文编号：2366467
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