A method for second natural frequency wind turbine tower modification is provided. The method includes the steps of: a) determining the second natural frequency of the wind turbine; b) calculating the anti-node of the second natural frequency to determine the point of the wind turbine tower that suffers the greatest displacement during the second natural vibration mode; c) determining an height of the tower corresponding with the anti-node calculated in b); d) calculating a mass to be placed at the height of the tower to modify the second natural frequency considering that a heavier mass leads to a lower second natural frequency; e) placing the mass calculated in step d) at the height determined in step c).
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