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In this article we propose a new method for reducing Newtonian noise inlaser-interferometric gravitational-wave detectors located on the Earth'ssurface. We show that by excavating meter-scale recesses in the ground aroundthe main test masses of a gravitational wave detector it is possible to reducethe coupling of Rayleigh wave driven seismic disturbances to test massdisplacement. A discussion of the optimal recess shape is given and we usefinite element simulations to derive the scaling of the Newtonian noisesuppression with the parameters of the recess as well as the frequency of theseismic excitation. Considering an interferometer similar to an Advance LIGOconfiguration, our simulations indicate a frequency dependent Newtonian noisesuppression factor of 2 to 4 in the relevant frequency range for a recesses of4m depth and a width and length of 11m and 5m, respectively. Though a retrofitto existing interferometers seems not impossible, the application of ourconcept to future infrastructures seems to provide a better benefit/cost ratioand therefore a higher feasibility.

Passive Newtonian noise suppression for gravitational-wave observatories based on shaping of the local topography