The U.S. Geological Survey sees the fault as posing a risk of more magnitude 7.0 earthquakes. Oblique Faults that combine sideways with up-and-down motions are called oblique by seismologists.
Try it out. With this little tool you can either enter RGB (Red-Green-Blue) values, HSB (Hue-Saturation-Brightness) numbers or a hexadecimal code for a color, to find its closest match of a named color and its corresponding hue. It is also possible to just use the sliders to see how color hues are changing.
You can certainly choose a CMYK or HSL dialog in the fill and stroke and all colour pickers, but it converts all colors to 8 digit hex as you willl see in the bottom of the picker. Since RGB and CMYK spaces are both device-dependent spaces, there is no simple or general conversion formula that converts between them.