Hand vibrato consists of an active movement of the hand from the wrist, supported by balancing movements in both forearm and upper arm. It is best developed in 4th or 5th position with the wrist touching the ribs of the violin to focus on the active hand movement.
Start with a wide action with the finger sliding along the string (similar to shifting positions). Then while keeping the movement going, narrow the width of finger slide so that the finger pad stays in one place.
Hand vibrato is sometimes referred to as wrist vibrato.
- for Adventures in Violinland by Shirley Givens