地下水位中潮汐与气压效应分析

从井水位中潮汐与气压效应的原理分析入手，着重解决输入量间的多重共线性问题。采用偏最小二乘法回归模型对水位数据中的潮汐与气压效应进行计算发现，该方法得到的潮汐与气压响应系数可正确反映潮汐引力与气压波动的物理过程；潮汐系数、气压系数、气压作用的滞后与延时常数等与含水层参数（储水率、孔隙度、渗透率、体积模量等）以及井孔区域的地壳应力应变状态密切相关。通过川03井连续60 d井水位（步长为9 d）的计算，可从响应系数里识别明显的地震同震响应、震后调整过程和清晰的地震前兆异常。

Analysis of Tidal and Atmospheric Pressure Effects in the Water Level

In this paper, we analyze the principle of tidal and atmospheric pressure effects of the water level, focusing on solving the problem of multicollinearity between the input variables. The Partial Least Squares Regression (PLS) model is used to eliminate the tidal and atmospheric pressure effects, and the results show that the response coefficients can correctly reflect the physical processes of tidal force and atmospheric pressure fluctuations. Both the magnitude of the tidal and atmospheric pressure coefficients, and the hysteresis and delay constants of atmospheric pressure, are closely related to the parameters of the aquifer (i.e., storage, porosity, permeability, bulk modulus, etc.),the crustal stress, and strain state around the borehole. Through continuous 60 days (Step size is 9 days) calculation of Chuan 03# well, the seismic and co-seismic responses, the adjustment processes after earthquakes, and even precursor anomalies are clearly identified in the tidal and atmospheric pressure response coefficients.