并求出了垂直对称线上轴向应力由压应力转变成拉应力的过渡点。
The interim point on the vertical symmetrical line at which the axial stress changes from the compression stress to tensile stress is further found.
实际中，小井源距多波vsp观测的直达波满足这种沿垂直对称轴方向的近似条件，因此本方法具有重要的实际意义。
In practice, direct wave in near-offset multiwave VSP satisfies this approximate condition; so this method is of practical importance.
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