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How to Perform Vibrato
Vibrato is performed by employing arc-like motions.
An important fact to know is that the human ear recognizes and identifies pitches by the highest frequency produced.
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Vibrato begins from the exact pitch location at which it is perfectly in tune.
Apply the least amount of fingertip pressure to the string needed in order to create the pitch.
Then, arc the fingertip’s contact with the string slightly beneath the pitch.
Roll the fingertip away from the bridge, slightly under the pitch.
In order to complete one vibrato wave, arc the fingertip back to the pitch.
You can think of the fingertip rolling: 
NAIL PAD NAIL PAD
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VIBRATO is the relaxed and controlled fluctuation of pitches.
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