Multicomponent Long-Period Signal Separation.
Advanced Array Research Special rept. no. 6,
TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICES DIV
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The report discusses several processors, designed and evaluated on long-period LASA data, for separating time-overlapping Rayleigh-wave arrivals. It has been observed in an earlier report that large-aperature vertical seismometer array processors diameter approximately equals 120 km did not show the expected superiority over small-aperature array processors diameter approximately equals 30 km. It was tentatively concluded that loss of signal coherence resulting from waveform variations across the large array interferes with effective coherent processing. The first portion of this report deals with confirmation of this conclusion. Based on these results, a suggestion is made for possible improvement of the performance of small-aperature vertical seismometer array processors. The major part of the report deals with several types of 3-component processors. It is demonstrated that multichannel filters MCF employing 3-component instruments can significantly outperform a corresponding processor using vertical components alone. However, the 3-component processor shows about 3 db of signal attenuation none was observed with the vertical component processor. Author
- Seismic Detection and Detectors