Enhancement of Teleseismic Body Phases with a Polarization Filter
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Cites background or methods from "Enhancement of Teleseismic Body Pha..."
...To emphasize this feature of the data, the three-component data, (z, n, e), are prefiltered with a polarization filter (e.g., Montalbetti and Kanasewich, 1970; Aster et al., 1990)....
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...Aster et aL (1990), Magotra et al. (1987, 1989), Montalbetti and Kanasewich (1970), and Flinn (1965), to name a few, constructed detectors and filters based on the eigenvalues and eigenvectors of the three-component covariance matrix....
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393 citations
Cites background or methods from "Enhancement of Teleseismic Body Pha..."
...This scheme differs from that of Montalbetti and Kanasewich (1970) in which a running average is subtracted from the seismograms before computing the covariance ....
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...The real counterpart to the filter described below was first presented by Montalbetti and Kanasewich (1970)....
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...In addition, and this is particularly true for the scheme of Montalbetti and Kanasewich (1970), the polarization character of the higher frequency energy is more stably estimated, as there are more wavelengths within the time-averaging window....
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...The RE- MODE filter (Mims and Sax, 1965) and the polarization filter of Montalbetti and Kanasewich (1970) are used to enhance highly polarized portions of the signal automatically....
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"Enhancement of Teleseismic Body Pha..." refers methods in this paper
...Eccentricity, major axis, and angle of inclination of the ellipse from the vertical are displayed for the frequency at which maximum power is arriving and used to provide criterion for the identification of P and S V type motion. Various workers have applied polarization filtering techniques to recorded seismic data for improvement of the signal to noise ratio. Lewis & Meyer (1968) apply a phase filter of the REMODE type as described by Archambeau & Flinn (1965) and originally developed by Mims & Sax (1965) with subsequent work by Griffin (1966a, b) to data recorded during the Early Rise experiment in the summer of 1966....
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...Various events were recorded at the University of Alberta’s Edmonton, Geophysical Observatory and at two field stations operated 5 and 10 km for the observatory using a broadband digital recording system described by Burke et al. (1970). The three data channels (vertical, east-west horizontal and north-south horizontal) were first bandpass filtered using a recursive zero phase shift digital filter and then rotated into an R-T-2 co-ordinate system so that the radial direction corresponded to the computed great circle azimuth from source to receiver and the transverse component was orthogonal to this....
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...Eccentricity, major axis, and angle of inclination of the ellipse from the vertical are displayed for the frequency at which maximum power is arriving and used to provide criterion for the identification of P and S V type motion. Various workers have applied polarization filtering techniques to recorded seismic data for improvement of the signal to noise ratio. Lewis & Meyer (1968) apply a phase filter of the REMODE type as described by Archambeau & Flinn (1965) and originally developed by Mims & Sax (1965) with subsequent work by Griffin (1966a, b) to data recorded during the Early Rise experiment in the summer of 1966. Archambeau, Flinn & Lambert (1969) used the same filter to study multiple P phases from NTS explosions. In another application, Basham & Ellis (1969) use a REMODE filter designated as a &Detection (P-D) filter to process P-wave codes of numerous seismic events recorded in western Alberta....
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...Eccentricity, major axis, and angle of inclination of the ellipse from the vertical are displayed for the frequency at which maximum power is arriving and used to provide criterion for the identification of P and S V type motion. Various workers have applied polarization filtering techniques to recorded seismic data for improvement of the signal to noise ratio. Lewis & Meyer (1968) apply a phase filter of the REMODE type as described by Archambeau & Flinn (1965) and originally developed by Mims & Sax (1965) with subsequent work by Griffin (1966a, b) to data recorded during the Early Rise experiment in the summer of 1966. Archambeau, Flinn & Lambert (1969) used the same filter to study multiple P phases from NTS explosions....
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