MOTION PRODUCT SEISMOGRAMS

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Abstract
This paper describes a means of combining the voltages from a three‐component seismometer so as to suppress noise waves arriving randomly from all directions and to indicate the direction of arrival of any particular wave‐train, such as might be caused by an earthquake, explosion, or moving vehicle. Each of the horizontal components of motion is electronically multiplied by the vertical component, with or without phase shift, and the two resulting products are displayed as a vector pointing to the source of seismic waves. The equipment assembled to perform these operations is referred to as the Motion Product Detector. Mathematical analysis and small‐scale tests of the Motion Product Detector on the Research Center grounds look promising.

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