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庐山重力基线场稳定性分析
汪健1,2, 韩宇飞3, 张新林1, 申重阳1, 胡敏章1, 梁伟锋4, 宋浩5, 徐如刚6, 刘少明1, 谈洪波1
1.中国地震局地震研究所地震大地测量重点实验室, 武汉 430071;2.中国科学院大学, 地球与行星科学学院, 北京 100049;3.中国地震台网中心, 北京 100045;4.中国地震局第二监测中心, 西安 710054;5.江苏省地震局, 南京 210014;6.安徽省地震局, 合肥 230000
摘要:
利用2018年庐山重力短基线场绝对重力和相对重力观测资料,基于绝对重力控制下的相对重力联测方式对庐山基线场的稳定性进行了分析。结果表明:庐山基线场2015~2018年测段重力变化为-11.6~13.4μGal、均值-0.962μGal,较小的重力变化表明庐山短基线重力场较稳定;2000~2018年测段重力变化为-39~33.5μGal、均值-0.275μGal,总体以G16测点为界呈分化特征,上山侧(G16~JZ04)重力变化较平缓(约-3 μGal),下山侧(G03~G16)因G04、G14测点重力值变化显著(分别为-24.95、-18.5μGal),导致相邻测段重力变化剧烈;测段重力变化与段差比值(B)为1.19×10-4~3.58×10-3;庐山及其周边地区由地表垂直运动引起的重力变化速率为0.7543±0.16μGal/a;近期研究区地震活动性呈震级小、沿断裂带集中分布特征;重力变化对相对重力仪一次项系数标定结果影响较大(正比于B值),对校正精度影响小,利用以往重力观测成果进行一次项系数标定时,绝对重力测段JZ02~JZ04误差影响小于最大重力段差测段,定期维护和复测是保障高精度重力短基线场的有效途径。
关键词:  庐山基线场  重力变化  格值标定  绝对重力观测  相对重力联测
DOI:
分类号:P315
基金项目:国家自然科学基金(41604014)、中国地震局地震研究所和应急管理部国家自然灾害防治研究院基本科研业务费专项资助项目(IS201926298)共同资助
Stability Analysis of the Lushan Gravity Baseline
Wang Jian1,2, Han Yufei3, Zhang Xinlin1, Shen Chongyang1, Hu Minzhang1, Liang Weifeng4, Song Hao5, Xu Rugang6, Liu Shaoming1, Tan Hongbo1
1.Key Library of Earthquake Geodesy, Institute of Seismology, CEA, Wuhan 430071, China;2.College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;3.China Earthquake Networks Center, Beijing 100045, China;4.The Second Monitoring and Application Center, CEA, Xi'an 710054, China;5.Jiangsu Earthquake Agency, Nanjing 210014, China;6.Anhui Earthquake Agency, Hefei 230000, China
Abstract:
In this article we use the absolute and relative gravity observation data in 2018 to analyze the stability of the Lushan gravity baseline,in which the relative gravity measurement is under control of the absolute gravity observation. The results show that the Lushan baseline gravity variation during 2015~2018 is -11.6~13.4μGal and the average value is -0.962μGal. The small gravity variation indicates that the Lushan short gravity baseline is relatively stable. The gravity variation during 2000~2018 is -39~33.5μGal with average value of -0.275μGal. G16 is as a turning point,where gravity changes on the uphill side(G16~JZ04)are relatively gentle(about -3μGal),and the downhill side(G03~G16)changes significantly due to the gravity change at the G04 and G14 station(respectively -24.95,-18.5μGal). The ratio of gravity change to section gravity difference(B)is 1.19×10-4~3.58×10-3. Rate of gravity change caused by vertical movement in Lushan area is 0.7543±0.16μGal/a. The recent seismic activity is characterized by small magnitudes and concentrated distribution along the fault zone,and gravity changes have a greater impact on the calibration results of the relative gravimeter(proportional to the value of B),while little influence on correction accuracy. When using the previous gravity observation results to calculate calibration,the error influence of the absolute gravity measurement section JZ02~JZ04 is less than the maximum gravity difference section. Regular maintenance and re-measurement are effective way to maintain high-precision gravity baseline.
Key words:  Lushan Gravity baseline  Gravity change  Scale calibration  Absolute gravity observation  Relative gravity measurement