At first there is the undistorted stripes pattern. Its compexity, i.e. the number and size of the stripes, is regulated with the Amplify value.

Whether horizontal or vertical stripes should be rendered, is defined by the Dimensions settings. If you set the switch to Both, radial wood elements are calculated.

To manipulate the distortion of the stripes, change the Octaves, Persistence and Resolution values.

By increasing the Turbulence value, you can raise the amplitude of the distortions.