首页 | 本学科首页   官方微博 | 高级检索  
     

钻孔体应变对气压和固体潮响应的传递函数——以陕西地区为例
引用本文:杨小林, 储日升, 危自根, 盛敏汉, 杨锦玲. 2021. 钻孔体应变对气压和固体潮响应的传递函数——以陕西地区为例. 地球物理学报, 64(8): 2749-2765, doi: 10.6038/cjg2021O0254
作者姓名:杨小林  储日升  危自根  盛敏汉  杨锦玲
作者单位:1. 中国科学院精密测量科学与技术创新研究院, 大地测量与地球动力学国家重点实验室, 武汉 430077; 2. 中国科学院大学, 北京 100049; 3. 陕西省地震局, 西安 710068; 4. 中国地震局地球物理研究所, 北京 100081; 5. 福建省地震局, 福州 350003
基金项目:国家重点研发计划;中国科学院战略性先导科技专项;中国科学院战略性先导科技专项;国家自然科学基金;国家国际科技合作专项基金;大地测量与地球动力学国家重点实验室自主课题
摘    要:
如何厘清钻孔体应变信号中的气压和固体潮频响效应,一直是地球动力学研究中的一大难点.区别于国内现有研究,本文尝试采用传递函数对陕西地区的4个体应变台进行了系统诊断.结果表明:(1)低频带(0.1~0.5 cpd)气压响应的稳定性和可靠性较好,高频带(8~30 cpd)次之,中频带(0.5~8 cpd)最差;(2)不同频带...

关 键 词:钻孔体应变  气压  固体潮  传递函数  不同频带  陕西地区
收稿时间:2020-07-06
修稿时间:2021-04-27

Transfer functions of borehole dilatometers response to barometric loading and solid Earth tides from low to high-frequency band:case study of Shaanxi Province
YANG XiaoLin, CHU RiSheng, WEI ZiGen, SHENG MinHan, YANG JinLing. 2021. Transfer functions of borehole dilatometers response to barometric loading and solid Earth tides from low to high-frequency band: case study of Shaanxi Province. Chinese Journal of Geophysics (in Chinese), 64(8): 2749-2765, doi: 10.6038/cjg2021O0254
Authors:YANG XiaoLin  CHU RiSheng  WEI ZiGen  SHENG MinHan  YANG JinLing
Affiliation:1. State Key Laboratory of Geodesy and Earth's Dynamics, Innovation Academy for Precision Measurement Science and Technology, Chinese Academy of Sciences, Wuhan 430077, China; 2. University of Chinese Academy of Sciences, Beijing 100049, China; 3. Shaanxi Earthquake Agency, Xi'an 710068, China; 4. Institute of Geophysics, China Earthquake Administration, Beijing 100081, China; 5. Fujian Earthquake Agency, Fuzhou 350003, China
Abstract:
The quest to find successful methods to distinguish and separate the contributions of the barometric loading and solid Earth tides from the time-series of volumetric strain, which are frequency-dependent, has proven to be very challenging in geodynamic studies.In order to uncover the continuous atmospheric and tidal responses of the volumetric strain in the frequency domain, we attempt to apply the transfer function to explore the signatures of frequency dependence observed at the four borehole dilatometer stations in Shaanxi Province, the adopted method is obviously different from the previous studies in China.The results show that: (1)The barometric responses are strongly stable and valid in the low-frequency band (0.1~0.5 cpd), while fluctuate in the intermediate-frequency band (0.5~8 cpd), and in the high-frequency band (8~30 cpd), the barometric responses are stable, respectively.(2)The averaged phase delays of barometric effect on the volumetric strain are less than 9° in different frequency bands, with the exception of the diurnal and partial frequency bands.(3)The discrepancies are remarkable for the trends of barometric coefficients over the full frequency range.Ignoring the significant fluctuations in the diurnal band, the Ankang station is approximately linear and stationary, while the dominant patterns are evidently nonlinear and nonstationary for the other three stations.(4)The tidal responses are stable and convergent in the semidiurnal frequency band, while scatter in the diurnal frequency band.Meanwhile, the results of tidal analyses for the main tidal constituents using transfer function compared with the least square fit method, are in good agreement.(5)The full signatures for the trend of barometric coefficients cannot be completely simulated by the double bush theory in the special case of a homogeneous and isotropic elastic medium, the usability of this theoretical model is quite limiting.Furthermore, we also discuss the potential driving sources which could contribute to the discrepancies and/or similarities in transfer functions from low to high-frequency band, respectively.In summary, the obtained results are useful for reasonably separating the frequency-dependent barometric and tidal effects from the volumetric strain records, as well as for providing the new insights and empirical evidences aiming to further constrain and refine the related geodynamic models.
Keywords:Borehole dilatometer  Barometric loading  Solid Earth tides  Transfer function  Different frequency bands  Shaanxi Province
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《地球物理学报》浏览原始摘要信息
点击此处可从《地球物理学报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号