Title :
Jackknifed multiple-window spectra and coherence applied to seismic data
Author :
Vernon, Frank L.
Author_Institution :
Inst. of Geophys. & Planetary Phys., California Univ., San Diego, La Jolla, CA, USA
Abstract :
Examines the variance of power spectra and magnitude squared coherences determined from local earthquake seismograms recorded synchronously on a small aperture seismic array. The multiple taper algorithm is used to calculate the spectra and coherences. Variances of these estimates are calculated with the jackknife technique, after transforming to a more normal distribution, and are compared with expected theoretical values. Due to the normalizing process the jackknife 95% confidence limits for the coherences and the spectra are slightly biased compared to theoretical values. The distribution of the jackknife error estimates has a large variance which is most likely caused by the non-stationarity of the original time series
Keywords :
array signal processing; coherence; geophysical signal processing; normal distribution; seismology; spectral analysis; time series; confidence limits; earthquake seismograms; jackknife error estimates; jackknife technique; jackknifed multiple-window spectra; magnitude squared coherence; multiple taper algorithm; normal distribution; normalizing process; power spectra coherence; seismic data; small aperture seismic array; time series; Apertures; Bandwidth; Convolution; Earthquakes; Eigenvalues and eigenfunctions; Frequency; Seismic measurements; Signal generators; Spatial resolution; Stress;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 1994. ICASSP-94., 1994 IEEE International Conference on
Conference_Location :
Adelaide, SA
Print_ISBN :
0-7803-1775-0
DOI :
10.1109/ICASSP.1994.389895
