Hartley Transform for Detection of Seismic Events

Abstract

An algorithm based on fast Hartley transform, which is faster than the fast Fourier transform (FFT), has been developed to detect seismic events, using both amplitude and frequency information. A single digital data stream is used to obtain a 32-point Hartley transform. The transform values are converted into a characteristic value which in turn is compared with a threshold value to declare an event. Frequency discrimination is made by using a selected portion of the Hartley transform bandwidth.

Indexing terms:

• Signal
• Seismic
• FFT
• Hartley transform