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１９９０年４月２６日青海共和７．０级地震的震后垂直形变速率具有典型的指数型衰减特征．本文根据Ｏｋａｄａ弹性位错地表垂直位移表达式，利用对应原理导出了其标准线性固体粘弹性解．通过引入“地球有效弛豫时间和有效粘度”的概念，进一步导出了由震后垂直形变求地球有效弛豫时间和粘度的简单公式，该公式与发震断层的位错参数无关．反演结果表明，共和震区地球介质的有效弛豫时间τ＝η／μ为２．６ａ，有效粘滞系数η为约１０１８Ｐａｓ．
On April 26, 1990, the vertical deformation rate after the MS 7.0 MS 7.0 earthquake in Qinghai Province showed typical exponential decay characteristics. According to the Okada elastic displacement dislocation vertical displacement expression, the corresponding linear solid viscoelastic solution is derived by using the corresponding principle. By introducing the concept of “effective earth relaxation time and effective viscosity”, a simple formula for calculating the effective relaxation time and viscosity of the Earth from vertical post-earthquake deformation is derived, which is independent of the dislocation parameters of the seismogenic fault. The inversion results show that the effective relaxation time τ = η / μ of earth medium in the total earthquakes zone is 2.6a, and the effective viscosity coefficient η is about 1018Pas.