Unknown
In:
Geophys. Res. Lett., Washington D.C., Bundesanstalt für
Geowissenschaften und Rohstoffe, vol. 31, no. 9, pp. 1-4, pp. L09611
Publication Date:
2004
Description:
Backazimuth estimates derived from surface wave polarization can be used to
test association of an observed surface wave with a seismic event. However, commonly
used techniques for estimating the backazimuth are subject to a number of errors and are
often inaccurate. We evaluate the performance of a new algorithm for determining
Rayleigh wave propagation direction from the cross-correlation of the horizontal and
Hilbert transformed vertical seismograms. This proves to be more accurate and much less
error-prone than current automatic processing procedures, and the cross-correlation
value provides a good measure of the reliability of the backazimuth estimate.
Consequently, the new algorithm will permit more reliable event association at a lower
magnitude threshold.
Keywords:
Horizontal to vertical spectral ratio
;
Nakamura
;
Spectrum
;
NOISE
;
Site amplification
;
Surface waves
;
Polarization
;
Rayleigh waves
;
Correlation
;
Hilbert transform
;
7200
;
Seismology
;
7219
;
Seismology:
;
Nuclear
;
explosion
;
seismology
;
7255
;
Surface
;
waves
;
and
;
free
;
oscillations
;
GRL
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