### ASA 130th Meeting - St. Louis, MO - 1995 Nov 27 .. Dec 01

## 4pSP2. The use of surface wave dispersion for source ranging.

**Jason T. Penshorn
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Randall W. Smith
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*Appl. Res. Labs., Univ. of Texas, 10,000 Burnet Rd., Austin, TX 78713
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Surface wave dispersion curves (velocity versus frequency curves) are used
to estimate source range. The data used in this study consist of signals, due to
an impulsive source, received on a line array of triaxial seismometers. The
first step in the ranging method is the estimation of the surface wave
dispersion curve. This is accomplished via the use of the continuous wavelet
transform as a time-frequency decomposition. The known dispersion curve is then
used in conjunction with the time-frequency decomposition of the received signal
to estimate source range. The method and some preliminary results were presented
previously [Smith et al., J. Acoust. Soc. Am. 97, 3310(A) (1995)]. This
presentation focuses on the effects of receiver separation and signal-to-noise
ratio on the ability to accurately estimate the surface wave dispersion curve,
and the corresponding effects on the source range estimates.