Values spread from core through output. There are basic set of values which become foundation stones for further enhancement which in turn give rise to more subtler values which become essential to form a perfectly valued human being.
The ripple effect has therefore been rightly used to depict the epientric point which consists of core values and are of higher concentration, and the values which are born out of these resemble ripples from the epicentre, where the concentration is less but the effect or spread is large.
You can further explore and more ripples to this concept. Add on more ripples by stating the values in the comments below which correlate to the basic set of values mentioned in the figure.