A random gravitational force can be generated by seismic noise, by atmospheric acoustic noise, and by moving massive bodies. An estimate of the gravitational power spectrum at a point on the Earth is given. Such a force is an important source of noise in an interferometric gravitational wave antenna below $f=10\mathrm{}$ Hz.

• Received 27 December 1984

DOI:https://doi.org/10.1103/PhysRevD.30.732