The term 'Earthly Vibration' can be summarized as a TREMOR, which is a 6 letter word. A TREMOR is an involuntary, rhythmic muscle contraction and relaxation involving oscillations or twitching movements of one or more body parts. It is a common symptom of neurological conditions such as Parkinson's disease, essential TREMOR, and dystonia. Tremors can also be caused by other medical conditions, including stroke, multiple sclerosis, and brain tumors.