An Attempt to Detect Gravitational Waves with the Yellowknife Seismic Arrayt†

The Yellowknife array of 19 vertical short-period seismometers was used to search for small coherent signals in the frequency range from about 1 to 8 Hz. Beamforming and autocorrelation of several hours of digital seismic recording lowers the background noise level to about 10−11 ms−1. Consistent peaks are observed at several frequencies, but terrestrial or instrumental origins have been identified for most components. None of the observed components shows correlation with sidereal time. There is, therefore, no evidence that gravitational waves have been detected.