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We study the behavior of bundles of superconducting vortices when increasingthe magnetic field using scanning tunneling microscopy and spectroscopy (STM/S)at 100 mK. Pinning centers are given by features on the surface corrugation. Wefind strong net vortex motion in a bundle towards a well defined direction. Weobserve continuos changes of the vortex arrangements, and identify smalldisplacements, which stress and deform the vortex bundle, separated by largerre-arrangements or avalanches, which release accumulated stress.

Direct observation of stress accumulation and relaxation in small bundles of superconducting vortices in tungsten thin-films