Accession Number:

ADA008961

Title:

Compressional Wave Power Spectrum from Seismic Sources

Descriptive Note:

Final rept. 30 Jun 1972-31 Dec 1974

Corporate Author:

HELSINKI UNIV (FINLAND) INST OF SEISMOLOGY

Personal Author(s):

• Noponen, Ilkka T.

Report Date:

1975-02-21

Pagination or Media Count:

70.0

Abstract:

The power spectra and waveforms of P-wave signals are studied using large aperture seismic array data. P-wave pulse lengths and attenuation are determined by deconvolution of records to earth displacement, and by comparing spectral shapes with predictions from source models. A least-square procedure is used to fit predicted spectra to observations by varying model parameters. In a classification experiment using statistical limits derived from NORSAR data and pulse widths measured at LASA, classification capability intermediate between the spectral discriminant LTM and the m sub b - M sub s discriminant was achieved, without any regional corrections.

Descriptors:

• *SEISMIC DETECTION
• *SEISMIC WAVES
• *SEISMOLOGICAL STATIONS
• CORRELATION TECHNIQUES
• EARTHQUAKES
• FINLAND
• HIGH FREQUENCY
• LEAST SQUARES METHOD
• LOW FREQUENCY
• MATHEMATICAL MODELS
• NORWAY
• NUCLEAR EXPLOSIONS
• POWER SPECTRA
• PREDICTIONS
• SEISMIC ARRAYS
• SIGNAL TO NOISE RATIO

Subject Categories:

• Seismology
• Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE