Extended Array Evaluation Program. Special Report No. 15. Evaluation of an Adaptive Three-Component Filter,

摘要

The three-component adaptive filter takes advantage of the phase relations between radial,vertical,and tangential seismometer traces which hold when Rayleigh and Love waves are present. This study finds that adaptively processed data has up to 6dB greater signal-to-noise ratio than simple bandpassed data. The detection threshold for single site data is lowered by an amount consistent with this gain,but the detection threshold for beam data is unchanged. An explanation for this difference,based on the character of single site and beam noise fields,is presented. Azimuthal discrimination and response of the filter to random noise are investigated. (Author)