福建省井水位与体应变观测一致性分析

发布时间：2018-04-30 20:10

本文选题：体应变 + 井水位　；参考：《地震学报》2017年03期

【摘要】：本文从时域和频域分别对福州台和永安台的体应变和井水位资料观测的一致性进行了分析,并对其力学机制进行了深入探究,在此基础上阐明了二者观测一致性的物理含义.时域内的分析结果显示:福州台体应变与井水位的相关系数为0.793 9,钻孔系统的灵敏度为0.055 8mm/10-9,井水位与体应变观测曲线十分相似;永安台体应变与井水位的相关系数为-0.754 3,钻孔系统的灵敏度为-0.000 5mm/10-9,井水位与体应变曲线呈镜像对称,这表明两台站的井水位与体应变观测高度相关,且二者的相位滞后近似为零.在频域内,分别对福州台2012年3—5月及永安台2014年3—5月的井水位和体应变资料进行维尼迪柯夫调和分析,分别获取半日波、全日波数个波群的逐月潮汐因子和相位滞后,并计算得到了钻孔系统的灵敏度和井水位相对于体应变的相位滞后.结果表明,3个月中大多数波群的灵敏度十分相近,而且与时域内所得年周期低频分量的灵敏度较接近,但相位滞后误差较大,这可能与采用反正切公式计算相位滞后受计算误差影响有关,即非线性的反正切公式对计算误差具有放大累积效应,因此相位滞后应以时域分析所得接近于零的结果为准.综上,时域和频域的分析结果表明,福州台和永安台的井水位对体应变的响应基本上是线性时不变的,二者观测一致性的根本原因在于两台站的承压含水层井水位观测系统基本上是满足叠加性、齐次性和时不变的物理可实现因果系统.
[Abstract]:In this paper, the consistency of body strain and well water level data of Fuzhou station and Yongan station are analyzed in time domain and frequency domain respectively, and the mechanical mechanism is deeply explored. The analysis results in time domain show that the correlation coefficient between body strain and well water level is 0.793 9, the sensitivity of drilling system is 0.055 8mm / 10 ~ (-9), the observation curve of well water level and volume strain is very similar; The correlation coefficient between body strain and well water level is -0.754 3, the sensitivity of drilling system is -0.0005mm / 10 ~ (-9), and the well water level and volume strain curve are mirror image symmetry, which indicates that the well water level is highly correlated with the volume strain observation at the two stations. And their phase lag is approximately zero. In the frequency domain, the well water level and bulk strain data of Fuzhou station from May to May 2012 and Yongan station from March to May 2014 are analyzed by Vinedikov harmonic analysis, and the monthly tidal factor and phase lag of half-diurnal wave group and all-day wave group are obtained, respectively. The sensitivity of drilling system and the phase lag of well water level relative to bulk strain are calculated. The results show that the sensitivity of most wave groups in three months is very close to that of the annual periodic low frequency components in time domain, but the phase lag error is larger. This may be related to the effect of calculation error on the phase lag calculated by using the inverse tangent formula, that is, the nonlinear inverse tangent formula has a cumulative effect on the calculation error, so the phase lag should be based on the result of time domain analysis, which is close to zero. In summary, the results of time and frequency domain analysis show that the response of well water level of Fuzhou station and Yongan station to bulk strain is basically linear time-invariant. The fundamental reason for the consistency of the two observations is that the observation system of the well level of the confined aquifer in the two stations basically satisfies the superposition and the homogeneity and time-invariance of the physical causality system can be realized.
【作者单位】：福建省地震局;福建省地震局永安地震台;福建省地震局福州地震台;
【基金】：2017年度震情跟踪定向工作任务(2017010224) 福建省地震局科研基金(SF201513)联合资助
【分类号】：P315.723

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