Abstract: According to the invention, in the method for determining the earthquake protection of buildings, the natural frequency of a building is determined. Moreover, the natural frequency of the ground surrounding the building is determined. Thereafter, a rating value for the building is calculated based on a comparison of the natural frequency of the building to the natural frequency of the ground. Based on this rated value, the earthquake protection of a building can be determined. Preferably, a failure probability for the building and an average damage to the building are calculated on the basis of the rating value, depending on the magnitude of the earthquake.