杨小林^1,2,3,,
储日升^1,,,
危自根¹,
盛敏汉¹,
杨锦玲^4,5
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（2018YFC504200），中国科学院战略先导科技专项（XDB41020202、XDB18010304），国家自然科学基金（U20A2095），中国科学院王宽诚率先人才计划"卢嘉锡国际合作团队项目"（GJTD-2018-12）和大地测量与地球动力学国家重点实验室自主项目（S21L6403）资助


详细信息

作者简介: 杨小林, 男, 博士研究生, 主要从事地震学和固体潮等方面研究.E-mail: yang-xiaolin123@163.com

通讯作者: 储日升, 男, 研究员, 主要从事地震学研究.E-mail: chur@asch.whigg.ac.cn

中图分类号: P315

收稿日期:2020-07-06
修回日期:2021-04-27
上线日期:2021-08-10

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^1,2,3,,
CHU RiSheng^1,,,
WEI ZiGen¹,
SHENG MinHan¹,
YANG JinLing^4,5
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


More Information

Corresponding author: CHU RiSheng,E-mail:chur@asch.whigg.ac.cn

MSC: P315

--> Received Date: 06 July 2020
Revised Date: 27 April 2021
Available Online: 10 August 2021


摘要
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）不同频带体应变对气压的滞后响应平均在9°以内，但日波和部分高频段的相位存在超前现象；（3）各台气压系数的频响差异显著，若不考虑日波频段的影响，安康台近线性平稳，其余3台则以非线性非平稳特性为主；（4）固体潮响应在半日波频段的稳定性和收敛性，均明显优于日波频段；此外，传递函数和最小二乘法所提取的潮波参数基本相符；（5）基于双衬套钻孔的线弹性介质模型，尚不足以刻画真实的气压响应全貌，其适用性有限.在此基础上，本文也对各台频响特征背后的物理机制进行了初探.相关结果不仅有助于气压和固体潮效应的分频改正，而且还能为相关动力学模型的构建和完善等提供新的视角和实证依据.
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

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.
Key words:Borehole dilatometer/
Barometric loading/
Solid Earth tides/
Transfer function/
Different frequency bands/
Shaanxi Province



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