By the change-of-base formula, the matrix becomes \[\begin{vmatrix} 1 & \frac{\log y}{\log x} & \frac{\log z}{\log x} \\ \frac{\log x}{\log y} & 1 & \frac{\log z}{\log y} \\ \frac{\log x}{\log z} & \frac{\log y}{\log z} & 1 \end{vmatrix}.\]This is equal to \[\frac{1}{\log x} \cdot \frac{1}{\log y} \cdot \frac{1}{\log z} \begin{vmatrix} \log x & \log y & \log z \\ \log x & \log y & \log z \\ \log x & \log y & \log z \end{vmatrix}.\]Since all the rows are equal, the determinant is $ \boxed{0} $.