A Study of Ps Converted Waves

Cook, Kenneth L.; Costain, John K.

doi:10.21236/ad0615474

1965

DOI: 10.21236/ad0615474

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A Study of Ps Converted Waves

Kenneth L. Cook¹,

John K. Costain²

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1967

1969

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Ground motion diagrams from pulse transmission through simple layered structures

Costain¹,

Robinson²,

Cook³

1967

J. Geophys. Res.

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By computing theoretical seismograms and ground motion diagrams for assumed source, functions passed through simple layered models, it is possible qualitatively to reproduce ground motion patterns and apparent beat frequency patterns that characterize some long range seismic measurement (LRSM) recordings of underground nuclear explosions. Interference of overlapping phases may result in ambiguous arrival times for later phases. Ground motion diagrams are useful for identifying shear motion that is not obvious on seismograms.

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Ground motion diagrams from pulse transmission through simple layered structures

Costain¹,

Robinson²,

Cook³

1967

J. Geophys. Res.

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The composition of P codas using magnetic tape seismograms

Basham¹,

Ellis

1969

Bulletin of the Seismological Society of America

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The short-period P codas of 41 seismic events recorded on the plains of western Alberta are examined for compressional and shear phases. A non-linear “P-Detection” polarization filter is applied to 25 seconds of the records following the P onset. Numerous compressional wave signal pulses are detected amid the codas; these include PcP and PKP phases for events at appropriate distances and the common depth phases pP and sP. The phase pP is detected on the records of 25 events, 16 of which have reported depths shallower than 40 km. For events with pP visible at two stations, pP-P times are accurate to about ±1 second, allowing focal depth assignment to an accuracy of about ±15 km. Locally-generated shear phases are studied using particle-motion plots in the vertical (vertical-radial) and horizontal planes. There are large variations in SV/P amplitude ratios for individual events at stations separated by 60 to 160 km. Anomalous SV and SH-type motions are attributed to a complex Precambrian basement.

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A Study of Ps Converted Waves

Cited by 2 publications

References 3 publications

Ground motion diagrams from pulse transmission through simple layered structures

Ground motion diagrams from pulse transmission through simple layered structures

The composition of P codas using magnetic tape seismograms

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